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Separator For Lithium Secondary Battery And Lithium Secondary Battery Including The Same

Abstract: The present invention relates to a separator for a lithium secondary battery and a lithium secondary battery comprising same the separator comprising: a porous substrate; and a lithium metal layer formed on a surface of the porous substrate wherein the lithium metal layer is formed on the outer peripheral surface of the porous substrate and has the shape of a hollow window frame.

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Patent Information

Application #
Filing Date
18 April 2019
Publication Number
37/2019`
Publication Type
INA
Invention Field
ELECTRICAL
Status
Email
IPO@KNSPARTNERS.COM
Parent Application
Patent Number
Legal Status
Grant Date
2023-11-23
Renewal Date

Applicants

LG CHEM, LTD.
128, Yeoui-daero, Yeongdeungpo-gu, Seoul 07336

Inventors

1. JUNG, Hye Ran
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122
2. CHOI, Young Geun
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122
3. OH, Song Taek
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122

Specification

[1][Mutual citations and related applications; [2]This application claims the benefit of priority based on the March 10th issue of Korea Patent Application No. 10-2017-0030759 and No. 03 in 2018, 08 dated Korea Patent Application No. 10-2018-0027369 2017, and of the Korea Patent Application everything described in the literature are included as part of the specification. [3] [Technology] [4] The present invention lithium relates to a separator and a lithium secondary battery comprising the same used for the secondary battery, and relates to a lithium secondary battery and more particularly, a lithium metal layer comprises is a lithium secondary battery separator, and this, in forming on a surface of the porous base will be. BACKGROUND [5] The demand for secondary batteries as an energy source, and is rapidly increased as the development of technology and the demand for mobile devices increases, Among such secondary battery shows a high energy density and operating potential, a long cycle life, self-discharge rate is low lithium secondary the battery is commercially available and widely used. [6] In addition, in recent years, to replace vehicles that use fossil fuels such as gasoline vehicles, diesel vehicles is one of the leading causes of air pollution electric vehicle (EV), hybrid electric vehicles (HEV), which, depending on the interest in environmental issues grows there is a lot of ongoing research and so on. The electric vehicle (EV), hybrid electric vehicles (HEV), etc. of a power source by mainly nickel but hydrogen metal (Ni-MH) secondary battery has been used, that uses a high energy density, the lithium secondary battery of high discharge voltage and the output stability the study has been actively conducted, there are some commercially available. [7] The lithium secondary battery is constructed in a structure that is a non-aqueous electrolyte containing lithium salt is impregnated to the electrode assembly, a porous separator is interposed between positive electrode active material which is applied each on the current collector and the negative electrode. [8] The lithium secondary battery is charged / discharged with only the lithium source of the positive electrode active material of the positive electrode life property is degraded if the lack of reversible lithium source. Thus, lifetime characteristics, this for recycling (recycle) by compensating the lithium source by a method of injecting additional electrolyte for a degenerated cell technology known, which create a passage for the additional injected in the already finished cells, the passage there is need for a hassle free process, such as closing. [9] Thus, a lithium secondary battery comprising a lithium electrode in a separate supplement that will be degraded when the lithium battery separately proposed. For example, a secondary battery is disclosed comprising a lithium electrode in addition to Patent Document Korea further disclosure the positive and negative electrodes No. 2005-0116795. Supra in which a secondary battery of a laminated type by spaced apart by either one or more, and the separator of the positive electrode or negative electrode to an additional lithium electrode is disclosed, also the gakgeuk collector is exposed to the secondary battery outside via the terminal when degeneration of the battery lithium the electrode terminal and the positive terminal or negative terminal of lithium ion to any positive or negative electrode to connect one or more of the disclosed a method of feeding. [10] This method creates a passage for further injecting the finished cell only boatman advantage was eliminated the inconvenience in that it does not require processes, such as closing the passage again, separate the lithium electrode and the positive electrode and the negative electrode are stacked together, so a cell configuration, have the disadvantage that the entire thickness of the cell increases. [11] On the other hand, the literature, but Japanese Unexamined Patent Publication No. 2002-324585 discloses having a third electrode comprising a further metal lithium in addition to the positive and negative electrodes, the secondary battery of the type 3 electrode is located away from the electrode assembly including a positive electrode and a negative electrode is It is disclosed. [12] This method requires additional create a passage for the pouring does not require processes, such as closing the passage again, but the advantage of metal lithium does not increase the overall thickness of the cell, metal lithium, lithium supplement in the finished cell Since with the electrodes and a distance to a position on one side there is a disadvantage that the replacement of the lithium ions does not occur uniformly as a whole electrode. [13] Therefore, there is no inconvenience due to the formation of a separate pathway for lithium supplement, without affecting the thickness, or the capacity of the battery even, there is a need to develop a lithium secondary battery which can compensate for the lithium source a more effective electrode. Detailed Description of the Invention SUMMARY [14] The problem to be solved by this invention is to provide a lithium secondary battery separator that includes a lithium metal layer which can provide a lithium source for the life property degraded secondary battery. [15] The problem to be solved another of the present invention is to provide a lithium secondary battery including the lithium secondary battery separator. Problem solving means [16] In order to achieve the foregoing object, the present invention provides a porous substrate; And a lithium metal layer formed on one surface of the porous substrate, [17] The lithium metal layer is formed along the outer peripheral surface of the porous substrate, there is provided a window frame shape in a lithium secondary battery separator with a hollow. [18] In order to solve the above other problem, the present invention is [19] Applying an electrode active material slurry including an electrode active material and a binder on the porous substrate to provide a method of manufacturing a lithium secondary battery separator, comprising the step of forming an electrode active material layer. [20] In order to solve the above other problem, the present invention is [21] anode; cathode; And includes a separator interposed between the positive and negative electrodes, [22] The separator is a porous substrate; And the lithium metal layer, and includes a lithium metal layer formed on one surface of the porous base is formed along the outer peripheral surface of the porous substrate, a window frame shape with a hollow, [23] The lithium metal layer provides a lithium secondary battery that surround the rim of the positive electrode at a position spaced apart from the anode. Effects of the Invention [24] A lithium secondary battery separator according to the invention wherein the lithium-metal layer, comprising: a porous substrate comprising a lithium metal layer on one surface is formed on the outer peripheral surface of the porous substrate, because a hollow window frame-like planar layer, the lithium when configuring a lithium secondary battery positive electrode positioned within the window frame shape in which the metal layer is formed, the lithium metal layer upon degradation of the lithium secondary battery can be supplemented to the positive lithium ions effectively. Brief Description of the Drawings [25] 1 is a view showing an example of a lithium secondary battery separator according to the exemplary embodiment of the present invention. [26] 2 is a view showing a cross-sectional view of an example of a lithium secondary battery separator according to the exemplary embodiment of the present invention. [27] Figure 3 is a view showing an example of the laminated type of the positive electrode, separator and negative electrode of the lithium secondary battery according to one embodiment of the present invention. Best Mode for Carrying Out the Invention [28] Hereinafter, the present invention will be described to assist understanding of the present invention in more detail. [29] Herein and in the terms or words used in the claims is general and not be construed as limited to the dictionary meanings are not, the inventor can adequately define terms to describe his own invention in the best way on the basis of the principle that the interpreted based on the meanings and concepts corresponding to technical aspects of the present invention. [30] [31] A lithium secondary battery separator is a porous substrate according to the present invention; And intended to include the lithium metal layer formed on one surface of the porous substrate, wherein the lithium metal layer is formed on the outer peripheral surface of the porous base, a layer of the plane window frame shape in a hollow. [32] The porous base material containing a lithium secondary battery separator according to one embodiment of the present invention, if the material which can be used for a lithium secondary battery separator has no particular limitation, for example, olefin polymers such as chemically resistant and hydrophobic polypropylene; And a sheet or non-woven fabrics made of glass fiber or polyethylene, etc. may be used, specifically, polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyether polyether sulfone, polyphenylene oxide, polyphenylene sulfide, polyethylene naphthalene, polyethylene, polypropylene, polybutylene, polyvinylidene fluoride, polypropylene with polyethylene oxide, acrylonitrile and polyvinylidene fluoride hexafluoro polyacrylic air It may be a membrane made of at least one selected from the group consisting of a polymer. [33] Porosity of the porous substrate is not particularly limited, it can be, for example, from 5% to 95%, and may be specifically 20% to 80%, more specifically 30% to 70%. If the porosity of the porous substrate, the range, it is possible to maintain adequate mechanical properties, without the smooth movement of the electrolyte cell performance degradation to prevent internal short circuit of the positive and negative electrodes. [34] The porous substrate may have a thickness of 5 ㎛ to 300 ㎛, may have a specific thickness of 10 ㎛ to 100 ㎛, more specifically 10 to 50 ㎛ ㎛ thickness. When the porous substrate has to have a thickness within the above range, yet can exhibit appropriate mechanical properties, a porous substrate itself can act or not to thicken the thickness of the lithium secondary battery with a resistance layer. [35] The porous substrate can have an average pore size, average pore size of specifically 10 nm to 90 nm, more specifically 30 nm to 50 nm from 10 nm to 100 nm. The pore size of the porous substrate indicates the diameter of the pores measured on the surface of the porous substrate. Method of measuring the average pore size may be not particularly limited, for example, be measured by the nitrogen adsorption isotherm (nitrogen adsorption isotherm) The resulting graph and pore size distribution (pore size distribution). [36] If the average pore size of the porous substrate one above range, the smooth movement of the electrolytic solution does not decrease the battery performance, may be properly maintain the mechanical properties of the porous substrate. [37] Lithium metal layer formed on one surface of the porous substrate can include a lithium metal, a lithium alloy or a mixture thereof, can be specifically includes a lithium metal with. [38] The lithium metal layer is formed on the outer peripheral surface of the one surface of the porous substrate. That is, the lithium metal layer is not to covering the surface of the porous substrate as a whole, not the lithium metal layer is formed in the inner non-peripheral face of the porous substrate. Therefore, the lithium metal layer has a window frame shape in a hollow. [39] A lithium secondary battery separator according to the exemplary embodiment of the present invention is shown schematically in Figs. [40] The figure is not intended that only the scope of the invention to illustrate the present invention is not limited by it. In the drawings of the present invention, the size of each component may be exaggerated for illustration, may be different from the size to be actually applied. [41] Figure 1 shows a plan view of the lithium secondary battery separator according to one embodiment of the present invention is shown a cross-sectional view of a lithium secondary battery separator according to the exemplary embodiment of the present invention in FIG. 2. 1, when a lithium secondary battery separator according to one embodiment of the present invention is that the lithium metal layer 200 on the outer peripheral surface of the one surface of the porous substrate 100 is formed, referring to Figure 2, an example of the present invention according lithium metal layer in the lithium secondary battery, a separator 200 is formed on the outer peripheral surface of the porous substrate 100 can be confirmed that in the window frame forms a hollow. [42] Inside the empty window frame type in which the metal lithium layer is formed it may be a space where the anode is located. Thus, when the anode positioned within an empty window frame type in which the metal lithium layer is formed, the lithium metal layer can surround the edge of the positive electrode at a position spaced apart from the anode. [43] The thickness of the lithium metal layer may be appropriately adjusted in accordance with the positive electrode capacity to recover after degradation of a lithium secondary battery including the lithium secondary battery separator, the upper limit of the thickness can be determined to less than the thickness of the positive electrode. For example, the lithium metal layer may have a thickness of 1 ㎛ to 500 ㎛, may have a specific thickness of 5 to 100 ㎛ ㎛, more specifically 5 to 20 ㎛ ㎛ thickness. [44] The lithium metal layer may have an area of ​​1% to 40% relative to the area of ​​100% of a window frame shape in the interior of the blank, specifically having a 2% to 20%, the area of ​​5% to 10%, more specifically can. [45] If the lithium metal layer with respect to the area of ​​the window frame shape in the inner blank have a surface area of ​​the rate, the size or capacity of the positive electrode to produce a lithium secondary battery using the separator is located inside the window frame-shaped even when the degradation of the lithium secondary battery without affecting may include an amount of a lithium source with the lithium metal layer to compensate for the lithium ions to the positive electrode effectively. [46] How to form the lithium metal on the surface of the porous substrate is a laminate (lamination) film of lithium metal to one surface of the porous base material, or lithium metal chemical vapor deposition (CVD, chemical vapor deposition), or physical vapor deposition It can be made by a method of (PVD, physical vapor deposition). [47] Forming a lithium metal layer may be formed under the conditions the lithium metal does not occur the contact between the surrounding water and oxygen to reduce the risk that will react with water or air around the forming or explosion of the lithium oxide. To this end, the forming of the metal lithium layer may be carried out under an inert gas atmosphere, the inert gas atmosphere may be argon or nitrogen atmosphere. [48] Further, the present invention provides a rechargeable lithium battery including the lithium secondary battery separator. [49] The lithium secondary battery has a positive electrode; cathode; And the lithium-metal layer, comprising the lithium secondary battery, a separator interposed between the positive and negative electrodes is surrounding the edge of the positive electrode at a position spaced apart from the anode. [50] The separator is a porous substrate; And the lithium metal layer, and includes a lithium metal layer formed on one surface of the porous base is formed along the outer peripheral surface of the porous substrate, a window frame shape in a hollow. [51] The positive electrode may be located inside of an empty window frame shape to form the lithium metal layers. Thus, when the anode positioned within an empty window frame type in which the metal lithium layer is formed, the lithium metal layer can surround the edge of the positive electrode at a position spaced apart from the anode. [52] Figure 3 shows the stacking of the positive electrode, separator and negative electrode of the lithium secondary battery according to one embodiment of the invention shown in Fig. [53] 3, the outer peripheral surface of the porous substrate 100, and a lithium metal layer 200 is formed, the internal space of the lithium metal layer 200 is formed on the outer peripheral surface, the porous substrate 100 is exposed. Lithium metal layer 200 and the anode 300 is located in the space inside, in the cathode 400, the other surface of the porous substrate 100 are located. [54] [55] The positive electrode and the lithium metal layer may be spaced apart by a distance equal to 20% to 12,000% when the thickness of the positive electrode is 100%, specifically 40% to 6,000%, and more specifically, 100% to 3,000% there may be spaced apart. [56] The positive electrode and the lithium metal layer may be spaced apart in a predetermined distance range, based on the thickness of the anode, the distance of which the positive electrode and the lithium metal of the use of the lithium secondary battery is too close to be in contact with each other, and when the distance is too great, it can be a lithium supplement the effect of the positive electrode decreases from the lithium metal. Thus, the positive electrode and the lithium metal layer is a lithium source supply after degradation of but a lithium secondary battery when it is spaced by a distance corresponding to the range relative to the thickness of the positive electrode, maintaining stable the spaced state of the positive electrode and lithium metal layers this process can be done effectively. [57] In addition, the positive electrode and the separation distance 10 ㎛ to 10 mm of the lithium metal, and may be specifically 20 ㎛ to 5 mm, more specifically 50 ㎛ to 2 mm. If the separation distance of the positive electrode and the lithium metal layer be the above-mentioned range, can be maintained in the spaced state of the positive electrode and the lithium metal layer stable, the lithium source supply stage after the deterioration of the lithium secondary battery can be made effective. [58] In the example of the present invention, the positive electrode and the lithium metal may be to meet with the separation distance according to the distance and the specific length values ​​relative to the thickness of the positive electrode. [59] Being that the positive electrode and the lithium metal layer spaced apart in the present invention means that there is no direct contact surface or contact points on the positive electrode and the lithium metal interlayer. [60] On the other hand, a negative electrode in lithium secondary batteries typically is compared with the positive electrode large and its area, wherein the lithium metal comprises a lithium secondary battery according to one embodiment of the present invention may have a smaller area than the area difference between the cathode and the anode. [61] The lithium metal is no need to adjust the negative electrode and has a smaller area than the area difference between the anode, the size and shape of the positive electrode, depending on the size or shape of the lithium metal layer in formed on the outer peripheral surface of the porous base of the separator, the lithium metal It does not affect the capacity of the positive electrode. [62] The lithium metal layer may have an area of ​​1% to 40% relative to the area of ​​100% of the positive electrode, it is possible to specifically have a 2% to 20%, more specifically, an area of ​​5% to 10%. [63] The lithium metal layer in this case with respect to the surface area of ​​the anode have a surface area of ​​the ratio, when degradation of the lithium secondary battery, without compromising the capacity of the positive electrode included in the lithium secondary battery, the lithium metal layer is effective lithium to the anode ions may include the amount of lithium source to be supplemented. [64] Capacity of the lithium-metal layer capacitance of 5% to 60% with respect to, and may be suitably adjusted according to the capacity of the positive electrode, the capacity of the lithium metal layer to the capacity 100% of the positive electrode, in particular 10% to 50%, more specifically, it can be controlled to have a capacity of 20% to 40%. [65] The lithium metal layer may be connected to the lithium electrode terminal, which is exposed to the outside of the lithium secondary battery. The lithium electrode terminal is connected to the anode and electrically may be such that lithium ions are supplied to the anode from the lithium-metal layers. [66] That is, the lithium secondary battery may include a lithium electrode terminal to be connected with the positive electrode terminal, which is exposed to the outside, the negative electrode terminal and the lithium metal layer of the lithium secondary battery, when the lithium secondary battery is degraded, the Li by connecting the electrode terminal and the positive terminal by the current flowing between the lithium electrode and the positive electrode it can be made the recycling of the lithium secondary battery by supplying lithium ions to the positive electrode. [67] The lithium metal layer is because a form that surrounds the periphery of the positive electrode, the lithium ion conductivity of the positive electrode from the lithium-metal layer can be made more effectively. [68] [69] The positive electrode may be prepared by conventional methods known in the art. For example, to manufacture a binder, a conductive agent, were prepared for and a dispersant mixture and stirred slurry was applied (coating) it to the current collector of a metal material and the positive electrode by a compression after drying, depending on the solvent, it is required for the positive electrode active material have. [70] The collector of the metallic material which is conductive with high metal, the slurry of the positive electrode active material easily with a metal that can be bonded in the voltage range of the battery so long as having a high conductivity without causing chemical changes in the fabricated battery particularly limited it is not, for example, stainless steel, aluminum, nickel, titanium, sintered carbon, or aluminum or stearyl Reinforced less carbon, nickel on the surface of the steel, titanium and the like may be used as a surface treatment or the like. It is also possible to form fine irregularities on the current collector surface to increase the adhesion of the positive electrode active material. Collector is available in many forms films, sheets, foils, nets, porous structures, foams and non-woven fabrics, etc., and may be one having a thickness of 3 to 500 ㎛. [71] In the production method of the lithium secondary battery of the present invention, the cathode active material such as lithium cobalt oxide (LiCoO 2 ); Lithium nickel oxide (LiNiO 2 ); Li [Ni a Co b Mn c M 1 d ] O 2 (wherein, M 1 is Al, and any one or two or more of these elements is selected from the group consisting of Ga and In, 0.3≤a <1.0, 0 ≤b≤0.5, a 0≤c≤0.5, 0≤d≤0.1, a + b + c + d = 1); Li (Li e M 2 f-e-f ' M 3 f' ) O 2 - g A g , and (wherein, 0≤e≤0.2, 0.6≤f≤1, 0≤f'≤0.2, 0≤g≤0.2 , M 2Is Mn and, Ni, Co, Fe, Cr , V, Cu, Zn , and comprises at least one element selected from the group consisting of Ti, M 3 and is at least one element selected from the group consisting of Al, Mg and B , a is P, F, S, and at least one member selected from the group consisting of N) layer compound or one or more of the compound substituted with transition metals, and the like; Li 1 + h Mn 2 - h O 4 (wherein 0≤h≤0.33), LiMnO 3 , LiMn 2 O 3 , LiMnO 2 Li-Mn oxide and the like; Lithium copper oxide (Li 2 CuO 2 ); LiV 3 O 8 , V 2 O 5 , Cu 2 V 2O 7 , etc. of vanadium oxide; Formula LiNi 1 - i M 4 i O 2 (wherein, M 4 Ni site type lithium nickel oxide represented by a = Co, Mn, Al, Cu, Fe, Mg, B or Ga, 0.01≤i≤0.3); Formula LiMn 2 - j M 5 j O 2 (wherein, M 5 = Co, Ni, Fe, Cr, and Zn, or Ta, 0.01≤j≤0.1) or Li 2 Mn 3 M 6 O 8 (wherein, M 6 lithium-manganese composite oxide represented by = Fe, Co, Ni, Cu or Zn); Some of the formula LiMn Li is substituted with alkaline earth metal ion 2O 4 ; Disulfide compounds; LiFe 3 O 4 , Fe 2 (MoO 4 ) 3 While the like, but is not limited to these. [72] The solvent for forming the positive electrode is N- methylpyrrolidone (NMP), dimethylformamide (DMF), acetone, and the organic solvent or water and the like, such as dimethylacetamide, these solvents alone or in combinations of two or more to be used in combination. The amount of the solvent is sufficient enough to be applied in consideration of the thickness of the slurry, the production yield and soluble dispersing the positive electrode active material, binder, conductive material. [73] The binder include polyvinylidene fluoride-acrylonitrile-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinylidene fluoride (polyvinylidenefluoride), polyacrylonitrile (polyacrylonitrile), polymethyl methacrylate (polymethylmethacrylate), polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene monomer (EPDM), sulfonated EPDM , styrene-butadiene rubber (SBR), fluorine rubber, polyacrylic acid (poly acrylic acid), and these are substituted for hydrogen with Li, Na, or Ca, such as a polymer, or a wide variety of binder polymer such as a variety of copolymers may be used. [74] So long as it has suitable conductivity without causing chemical changes in the fabricated battery. The conductive material is not particularly limited, for example, graphite such as natural graphite or artificial graphite; Acetylene black, Ketjen black, channel black, wave Ness black, carbon black and lamp black and thermal black; Conductive fibers such as carbon fibers and metallic fibers; Metal tubes, such as carbon nanotubes; Metal powders such as carbon, aluminum, nickel powder fluoro; Conductive whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Poly is a conductive material such as phenylene derivative may be used. [75] The dispersant may be an organic dispersant such as a water-based dispersant, or N- methyl-2-pyrrolidone. [76] The cathode can be prepared by conventional methods known in the art, for example, is producing a negative active material slurry by mixing and stirring the additives such as the negative electrode active material and a binder and a conductive material, dried, and applying it onto the negative electrode current collector after it may be prepared by compression. [77] Wherein a negative electrode active material comprises amorphous carbon or amorphous carbon, specifically I carbon such as graphitized carbon, graphite-based carbon; Li u Fe 2 O 3 (0≤u≤1), Li v WO 2 (0≤v≤1), SnxMe 1-x Me ' y O z (Me: Mn, Fe, Pb, Ge; Me': Al metal composite oxides such as 1≤z≤8);, B, P, Si, Group 1 of the Periodic Table, Group 2, Group 3 element, a halogen; 0 [96] By attaching such a 4 cm × 5 cm size polypropylene / polyethylene / width of 2 mm, the window frame shape by pressing lithium metal having a thickness of 20 ㎛ on the outer peripheral surface of the polypropylene structure porous separator having a thickness of 30 ㎛ in the form of lithium metal. At this time, when the lithium metal layer to surround a 3 cm × 4 cm size, the positive electrode of was attached to the lithium metal to be distance is separated by 2 mm with the positive electrode, the lithium metal layer to form a terminal for electrical connection. [97] [98] As a cathode active material LiNiMnCoO 2 94% by weight, the conductive agent of carbon black (carbon black) 3% by weight, a binder in N- methyl-2 to 3% by weight of PVdF was added to the solvent-pyrrolidone (NMP) to prepare a positive electrode mixture slurry . The positive electrode mixture slurry is the thickness of the positive electrode current collector of approximately 20 ㎛ aluminum (Al) applied to the thin film, and was dried, roll-pressed (press roll) were conducted to prepare a positive electrode of about 70 ㎛ thickness. [99] While the positive electrode 3 cm × 4 cm cut to size positioned within the lithium metal of the porous membrane prepared in the above is not formed, and where the distance between the lithium metal and the anode of the four-way around the anode so that the 2 mm, wherein the porous exposed to a graphite cathode to the other surface of the membrane, and then ethylene carbonate (EC) and diethyl carbonate (DEC), and 1M of LiPF in a solvent mixture in a volume ratio of 30: 70 6 by injecting the electrolytic solution is dissolved in the pouch-shaped cells It was prepared. [100] [101] Example 2 [102] The above-described embodiment in the formation of lithium metal from the first time to surround the positive electrode of the lithium metal layer is 3 cm × 4 cm size attach the lithium metal to be away is spaced by 1 mm with the positive electrode, and the anode of the porous membrane located inside the lithium metal layer is not formed, and except for where the distance between the lithium metal and the anode of the four-way around the anode so that 1 mm in example 1, and a method similar to, a separator and a lithium secondary battery It was prepared. [103] [104] Example 3 [105] In the first embodiment is a lithium metal layer except that in the width formed so as to be 1 mm, thickness 20 ㎛ in Example 1, and the same method, to prepare a separator and a lithium secondary battery. [106] [107] Example 4 [108] In the above embodiments except that the lithium metal in the first formation such that the width of 3 mm, 20 ㎛ thickness in Example 1 and the same method, to prepare a separator and a lithium secondary battery. [109] [110] Example 5 [111] [112] 5.5 cm × by attaching so that the 6.5 cm size of the polypropylene / polyethylene / peripheral face width of 2 mm, shaped window frame and pressing a lithium metal having a thickness of 20 ㎛ the propylene structure, a porous separator having a thickness of 30 ㎛ in the form of lithium metal. At this time, the metal lithium was deposited so that when the lithium metal layer to surround the cathode of 3 cm × 4 cm size, the distance and the positive electrode can be spaced apart by 10 mm. [113] [114] Example The anode prepared in the same manner as in 1 3 cm × 4 of lithium metal and the anode of the cut cm size all over, while located inside a lithium metal layer of the porous membrane prepared in the above is not formed, surrounding the anode and of a lithium secondary battery was prepared as in example 1, and the same method except for position so that the distance is 10 mm. [115] [116] Comparative Example 1 [117] In the first embodiment as in Example 1, and the same method except that a 4 cm × 5 cm size polypropylene / polyethylene / polypropylene structure, a porous separator having a thickness of 30 ㎛ of in place of the separator having a lithium metal layer a lithium secondary battery was prepared. [118] [119] Comparative Example 2 [120] [121] As a cathode active material LiNiMnCoO 2 94% by weight, the conductive agent of carbon black (carbon black) 3% by weight, a binder in N- methyl-2 to 3% by weight of PVdF was added to the solvent-pyrrolidone (NMP) to prepare a positive electrode mixture slurry . The positive electrode mixture slurry is the thickness of the positive electrode current collector of approximately 20 ㎛ aluminum (Al) applied to the thin film and then dried, a positive electrode subjected to a roll press (press roll) was prepared. [122] The anode and in contact on one side of the porous separator of the cut 4 cm × 5 cm size poly thickness 30 ㎛ of polypropylene / polyethylene / polypropylene structure of a 3 cm × 4 cm size, exposed to the graphite negative electrode on the other surface of the porous membrane then, after the other side of the surface which the positive electrode mixture layer of the positive electrode formed width 3 mm to (Al film) and a length of 5 mm, and exposed to a lithium metal thickness 20 ㎛ the Al thin film was fixed by a roll press, ethylene carbonate (EC) and diethylene 1M LiPF of the ethyl carbonate (DEC) in a solvent mixture in a volume ratio of 30: 70 6 to prepare a lithium secondary battery by the injection of the molten electrolyte. [123] TABLE 1 Spacing a positive electrode and a lithium metal layer Area ratio of lithium metal (100% based on the area of ​​the cathode) Capacity ratio of lithium metal (100% based on the area of ​​the cathode) Example 1 2 mm 20% 30% Example 2 1 mm 20% 30% Example 3 2 mm 10% 15% Example 4 2 mm 30% 45% Example 5 10 mm 20% 30% Comparative Example 1 - - - Comparative Example 2 - - 30% [124] Experimental Example [125] Examples 1 to 5 and Comparative Examples 1 and 2, a lithium secondary battery prepared was carried out in the charge / discharge at a 1C / 1C at 25 ℃ respectively. Carried out after 200 cycles it was confirmed that the capacity maintenance rate is 70%, and then, for example, 1 to 5, and a lithium secondary battery of Comparative Example 2, the electrically by using a terminal which is formed on the lithium metal of the lithium-metal layer which is formed on the membrane circuit the discharge was further applied, and then the configured current. After that were confirmed to Examples 1-5, and Comparative Example 2 after 100 cycles and the capacity maintenance rate of a lithium secondary battery proceeds to the charge / discharge at a 1C / 1C at 25 ℃ each. [126] TABLE 2 Capacity maintenance rate after 200cycle After adding capacity retention 100cycle Example 1 70.5% 78.6% Example 2 70.3% 79.2% Example 3 70.5% 66.2% Example 4 70.1% 79.5% Example 5 70.6% 60.1% Comparative Example 1 70.5% 57.3% Comparative Example 2 70.4% 57.5% [127] Referring to Table 2, the higher the positive electrode and lithium metal layers were separated distance is smaller the higher the capacity retention rate after the discharge with additional lithium metal content of the lithium-metal insert of the membrane was higher, the capacity retention ratio after adding the discharge. On the other hand, when placing the lithium metal on the whole back of the cathode current collector as in Comparative Example 2, the degree of improvement in the capacity maintenance rate of the Comparative Example 1 that are not further discharge performed after the additional discharge using a lithium metal was minimal. This is because the analysis was not smooth lithium source supplied to the anode. [128] [129] Claims [Claim 1]A porous substrate; And the lithium metal layer, and includes a lithium metal layer formed on one surface of the porous base is formed along the outer peripheral surface of the porous base, a hollow window frame shape in a lithium secondary battery separator with. [Claim 2] The method of claim 1, wherein the lithium metal layer is a lithium secondary battery separator has a thickness of 1 ㎛ to 500 ㎛. [Claim 3] The method of claim 1, wherein the lithium metal layer is a lithium secondary battery separator having an area of ​​1% to 40% based on the 100% area of ​​the window frame shape in the inside is empty. [Claim 4] anode; cathode; And includes a separator interposed between the positive electrode and the negative electrode, the separator is a porous substrate; And the lithium metal layer, and includes a lithium metal layer formed on one surface of the porous base is formed along the outer peripheral surface of the porous substrate, a window frame shape with a hollow, wherein the lithium metal layer is the anode and spaced , the lithium secondary battery that surround the rim of the positive electrode at the locations. [Claim 5] The method of claim 4, wherein the positive electrode and the lithium metal layer is a lithium secondary battery that are spaced apart by a distance equal to 20% to 12,000% when the thickness of the positive electrode is 100%. [Claim 6] The method of claim 4, wherein the positive electrode and the lithium metal layer is a lithium secondary battery that is spaced 10 ㎛ to 10 mm. [Claim 7] The method of claim 4, wherein the lithium metal layer has an area of ​​1% to 40% relative to the area of ​​100% of the positive electrode, the lithium secondary battery. [Claim 8] 4 wherein, the capacity of the lithium metal layer having a capacity of 5% to 60% with respect to 100% capacity of the positive electrode, the lithium secondary battery in. [Claim 9] Claim 4, wherein the said lithium secondary battery positive electrode terminal, negative electrode terminal and the lithium metal comprises a lithium electrode terminal in which the layer and the connection, and the lithium electrode terminal and the positive electrode terminal, which is exposed to the outside of the lithium secondary battery according to connected by supplying lithium ions to the positive electrode by flowing current between the lithium electrode and the positive electrode, the lithium secondary battery.

Documents

Application Documents

# Name Date
1 201917015519-IntimationOfGrant23-11-2023.pdf 2023-11-23
1 201917015519.pdf 2019-04-18
2 201917015519-PatentCertificate23-11-2023.pdf 2023-11-23
2 201917015519-STATEMENT OF UNDERTAKING (FORM 3) [18-04-2019(online)].pdf 2019-04-18
3 201917015519-Written submissions and relevant documents [17-11-2023(online)].pdf 2023-11-17
3 201917015519-POWER OF AUTHORITY [18-04-2019(online)].pdf 2019-04-18
4 201917015519-FORM-26 [08-11-2023(online)].pdf 2023-11-08
4 201917015519-FORM 1 [18-04-2019(online)].pdf 2019-04-18
5 201917015519-DRAWINGS [18-04-2019(online)].pdf 2019-04-18
5 201917015519-Correspondence to notify the Controller [06-11-2023(online)].pdf 2023-11-06
6 201917015519-US(14)-HearingNotice-(HearingDate-09-11-2023).pdf 2023-10-13
6 201917015519-DECLARATION OF INVENTORSHIP (FORM 5) [18-04-2019(online)].pdf 2019-04-18
7 201917015519-FORM 3 [24-01-2023(online)].pdf 2023-01-24
7 201917015519-COMPLETE SPECIFICATION [18-04-2019(online)].pdf 2019-04-18
8 201917015519-RELEVANT DOCUMENTS [03-05-2019(online)].pdf 2019-05-03
8 201917015519-8(i)-Substitution-Change Of Applicant - Form 6 [29-11-2022(online)].pdf 2022-11-29
9 201917015519-ASSIGNMENT DOCUMENTS [29-11-2022(online)].pdf 2022-11-29
9 201917015519-FORM 13 [03-05-2019(online)].pdf 2019-05-03
10 201917015519-PA [29-11-2022(online)].pdf 2022-11-29
10 abstract.jpg 2019-06-01
11 201917015519-CLAIMS [15-03-2022(online)].pdf 2022-03-15
11 201917015519-Verified English translation (MANDATORY) [16-10-2019(online)].pdf 2019-10-16
12 201917015519-COMPLETE SPECIFICATION [15-03-2022(online)].pdf 2022-03-15
12 201917015519-Proof of Right (MANDATORY) [16-10-2019(online)].pdf 2019-10-16
13 201917015519-certified copy of translation (MANDATORY) [16-10-2019(online)].pdf 2019-10-16
13 201917015519-DRAWING [15-03-2022(online)].pdf 2022-03-15
14 201917015519-FER_SER_REPLY [15-03-2022(online)].pdf 2022-03-15
14 201917015519-Information under section 8(2) (MANDATORY) [17-10-2019(online)].pdf 2019-10-17
15 201917015519-FORM 3 [17-10-2019(online)].pdf 2019-10-17
15 201917015519-OTHERS [15-03-2022(online)].pdf 2022-03-15
16 201917015519-FER.pdf 2021-10-18
16 201917015519-OTHERS-231019.pdf 2019-10-25
17 201917015519-OTHERS-231019-1.pdf 2019-10-25
17 201917015519-FER_SER_REPLY [29-09-2021(online)].pdf 2021-09-29
18 201917015519-FORM 18 [11-11-2020(online)].pdf 2020-11-11
18 201917015519-OTHERS-231019-.pdf 2019-10-25
19 201917015519-Correspondence-231019.pdf 2019-10-25
19 201917015519-FORM 3 [28-09-2020(online)].pdf 2020-09-28
20 201917015519-Correspondence-231019.pdf 2019-10-25
20 201917015519-FORM 3 [28-09-2020(online)].pdf 2020-09-28
21 201917015519-FORM 18 [11-11-2020(online)].pdf 2020-11-11
21 201917015519-OTHERS-231019-.pdf 2019-10-25
22 201917015519-FER_SER_REPLY [29-09-2021(online)].pdf 2021-09-29
22 201917015519-OTHERS-231019-1.pdf 2019-10-25
23 201917015519-FER.pdf 2021-10-18
23 201917015519-OTHERS-231019.pdf 2019-10-25
24 201917015519-OTHERS [15-03-2022(online)].pdf 2022-03-15
24 201917015519-FORM 3 [17-10-2019(online)].pdf 2019-10-17
25 201917015519-FER_SER_REPLY [15-03-2022(online)].pdf 2022-03-15
25 201917015519-Information under section 8(2) (MANDATORY) [17-10-2019(online)].pdf 2019-10-17
26 201917015519-certified copy of translation (MANDATORY) [16-10-2019(online)].pdf 2019-10-16
26 201917015519-DRAWING [15-03-2022(online)].pdf 2022-03-15
27 201917015519-COMPLETE SPECIFICATION [15-03-2022(online)].pdf 2022-03-15
27 201917015519-Proof of Right (MANDATORY) [16-10-2019(online)].pdf 2019-10-16
28 201917015519-CLAIMS [15-03-2022(online)].pdf 2022-03-15
28 201917015519-Verified English translation (MANDATORY) [16-10-2019(online)].pdf 2019-10-16
29 201917015519-PA [29-11-2022(online)].pdf 2022-11-29
29 abstract.jpg 2019-06-01
30 201917015519-ASSIGNMENT DOCUMENTS [29-11-2022(online)].pdf 2022-11-29
30 201917015519-FORM 13 [03-05-2019(online)].pdf 2019-05-03
31 201917015519-RELEVANT DOCUMENTS [03-05-2019(online)].pdf 2019-05-03
31 201917015519-8(i)-Substitution-Change Of Applicant - Form 6 [29-11-2022(online)].pdf 2022-11-29
32 201917015519-FORM 3 [24-01-2023(online)].pdf 2023-01-24
32 201917015519-COMPLETE SPECIFICATION [18-04-2019(online)].pdf 2019-04-18
33 201917015519-US(14)-HearingNotice-(HearingDate-09-11-2023).pdf 2023-10-13
33 201917015519-DECLARATION OF INVENTORSHIP (FORM 5) [18-04-2019(online)].pdf 2019-04-18
34 201917015519-DRAWINGS [18-04-2019(online)].pdf 2019-04-18
34 201917015519-Correspondence to notify the Controller [06-11-2023(online)].pdf 2023-11-06
35 201917015519-FORM-26 [08-11-2023(online)].pdf 2023-11-08
35 201917015519-FORM 1 [18-04-2019(online)].pdf 2019-04-18
36 201917015519-Written submissions and relevant documents [17-11-2023(online)].pdf 2023-11-17
36 201917015519-POWER OF AUTHORITY [18-04-2019(online)].pdf 2019-04-18
37 201917015519-PatentCertificate23-11-2023.pdf 2023-11-23
37 201917015519-STATEMENT OF UNDERTAKING (FORM 3) [18-04-2019(online)].pdf 2019-04-18
38 201917015519-IntimationOfGrant23-11-2023.pdf 2023-11-23
38 201917015519.pdf 2019-04-18

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