Lithium Electrode And Lithium Secondary Battery Comprising Same And Flexible Secondary Battery
Abstract:
The present invention provides a lithium metal electrode and a lithium secondary battery comprising the lithium metal electrode; and a flexible secondary battery the lithium metal electrode comprising: a current collector having an upper surface with a concavo-convex structure; a lithium metal layer positioned outside a portion excluding the upper surface with the concavo-convex structure of the current collector; an electron non-conductive protection layer positioned outside the lithium metal layer; and a lithium ion separation layer positioned on the upper surface with the concavo-convex structure of the current collector or on the upper surface with the concavo-convex structure of the current collector on the upper side of the lithium metal layer and on the upper side of the electron non-conductive protection layer wherein the electron non-conductive protection layer includes a non-porous layer and a polymer porous layer positioned outside the non-porous layer.
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Notices, Deadlines & Correspondence
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
2. KANG, Dong-Hyeon
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
3. UHM, In-Sung
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
4. KANG, Sung-Joong
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
5. JANG, Min-Chul
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
6. SON, Byoung-Kuk
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
7. LEE, Dong-Chan
LG Chem Research Park, 188, Munji-ro,
Yuseong-gu,
Daejeon 34122
Specification
[1]The present invention relates to a lithium electrode, and more particularly, safety is improved life characteristics and rate of lithium secondary battery and a flexible secondary battery (rate) characteristic comprises 3D lithium electrode, it excellent.
[2]This application claims priority to an application for the Korea Patent Application No. 10-2017-0114598 call and the Korea Patent Application No. 10-2017-0114599, filed on September 07 dated 2017, filed on September 07, dated 2017 , all contents disclosed in the specification and drawings of that application are incorporated in this application by reference.
BACKGROUND
[3]
And rechargeable, and the rapidly increasing demand for compact and high capacity secondary battery is possible, as the technical development and demand for mobile devices increases. In addition, a lithium secondary battery having high energy density and voltage of the secondary batteries are commercially available and widely used.
[4]
Configurations whereby the lithium secondary battery has a cathode, an anode, and having the cathode and the separator of the electrode assembly is stacked or wound structure including interposed between the anode, an electrode assembly is built into the battery case, the non-aqueous electrolytic solution is injected therein, do. The lithium secondary battery produces electric energy by oxidation and reduction reaction when lithium ions to be inserted / desorbed from the cathode and the anode.
[5]
In general, as the active material on the electrode by, but is an advantage to implement a high capacity, according to the charging and discharging of the battery is repeated is dissolved or precipitated by ionization of lithium metal lithium dendrite (dendritic lithium) form when using the lithium metal and grow, which is the cause of the short circuit and isolated lithium (dead lithium) of the battery reliability is weak and short-lived is a problem.
[6]
Thus, the lithium dendrite growth, but various methods have been attempted to suppress the, has not yet been fully resolved by.
Detailed Description of the Invention
SUMMARY
[7]
The present invention for solving the above problems, one object of the invention to inhibit the growth of a non-uniform lithium dendrites, the safety is improved life characteristics and rate (rate) characteristic is provided a three-dimensional lithium electrode excellent to.
[8]
Another object of the invention is to provide a lithium secondary battery, and a flexible secondary battery including the lithium electrode.
Problem solving means
[9]
One aspect of the invention relates to a lithium metal electrode according to the embodiment.
[10]
The first embodiment is,
[11]
A current collector having a concave-convex structure having a top surface;
[12]
The lithium metal layer positioned outside of the portion other than the top surface of the concave-convex structure in the current collector;
[13]
The electron non-conductive protective layer located on the outside of the lithium metal; And
[14]
The upper face of the concave-convex structure of the current collector, or contains a lithium ion isolation layer disposed above the top surface of the house and the whole concavo-convex structure of the lithium metal on the upper side and the electron non-conductive protection layer,
[15]
The electron non-conductive protective layer is transferred lithium ions, and relates to a lithium metal electrode comprising an imperforate layer and the polymer porous layer located on the outside with no pores.
[16]
The second embodiment is the first embodiment,
[17]
The concave-convex structure is formed protruding upward of the collector, and to a lithium metal electrode having a groove formed on the protrusion side.
[18]
The third embodiment is characterized in that, in the second embodiment,
[19]
And a vertical cross-section the pawl portion form a square, at least one selected from a trapezoidal shape, and the cross-shaped, the vertical cross-section of the groove portion semi-circular, fan-shaped type, triangular, a square, and a lithium metal electrode at least one selected from the dumbbell-like form It relates.
[20]
The fourth embodiment is characterized in that, in the first to third embodiments implement any one of the Examples,
[21]
The imperforate layer is directed to a lithium metal electrode, which comprises an inorganic solid electrolyte and an electrolyte swellable polymer.
[22]
The fifth embodiment is characterized in that, in the fourth embodiment,
[23]
The inorganic solid electrolyte as the electrolyte water-swellable polymer is 70:30 to 98: relates to a lithium metal electrode contained in a weight ratio of 2.
[24]
The sixth embodiment is characterized in that, in the fourth or fifth embodiment,
[25]
The inorganic solid electrolyte is directed to a lithium metal electrode comprising an oxide-based, phosphate-based, nitride-based, sulfide-based, or a mixture of two or more of them.
[26]
The seventh embodiment is, according to any of the embodiments of the fourth to sixth embodiments,
[27]
The water-swellable polymer electrolyte is directed to a lithium metal electrode comprising a polyolefin, polyester, polyacrylic, polyamide-based, polyurethane-based, cellulose-based, carbohydrate-based, polyol, or mixture of two or more of them.
[28]
The eighth embodiment, in the fourth to seventh embodiments, any one of the embodiments,
[29]
The imperforate layer is Al 2 O 3 , SnO 2 , Cu 3 N 2 , CeO 2 , MgO, NiO, CaO, ZnO, ZrO 2 , Y 2 O 3 , TiO 2 , SiC, Li 3 N, or two or more of these mixture analogy relates to a lithium metal electrode further comprises a conductive inorganic substance comprising a.
[30]
The ninth embodiment is, in the first to eighth embodiments implementing any one of the Examples,
[31]
The polymer porous layer is directed to a lithium metal electrode made of a polymer film having a porous structure having an electrolyte swellable.
[32]
A tenth embodiment is, according to a ninth embodiment,
[33]
The polymer film of the porous structure with the electrolyte swellable relates to a lithium metal electrode comprising a sponge-like polyurethane.
[34]
An eleventh embodiment, in the first to tenth embodiments implementing any one of the Examples,
[35]
The electron non-conductive protective layer is directed to a lithium metal electrode has a thickness of 1 to 1,000㎛.
[36]
12th embodiments, according to claim 1 to which one embodiment of the eleventh embodiment,
[37]
In the electron non-conductive protective layer, the imperforate layer relates to a lithium metal electrode has a thickness of 1 to 500nm.
[38]
A thirteenth embodiment, in the first to twelfth embodiments implementing any one of the Examples,
[39]
The lithium ion isolation layer relates to a lithium metal electrode comprising a polyolefin-based, polyester-based, polyamide-based, polyurethane-based, or a mixture of two or more of them.
[40]
Another aspect of the present invention provides a lithium secondary battery according to the embodiment.
[41]
14 embodiment are the
[42]
In the separator, and a lithium secondary battery comprising an electrolyte interposed between the cathode, the anode, the cathode and the anode,
[43]
The anode is related to any one of claims 1 to 13, any one of a lithium metal electrode, a lithium secondary battery of the claims.
[44]
Fifteenth embodiment is, according to the fourteenth embodiment,
[45]
The lithium secondary battery, to a cylindrical, prismatic, pouch-type, a flexible type or coin-type lithium secondary battery.
[46]
Another aspect of the present invention provides a flexible secondary battery according to the embodiment.
[47]
16th embodiments,
[48]
An internal electrode provided with internal electrode layers containing - inside the collector and the lithium surrounding the outer side of the power generating body inside the house;
[49]
Surrounding the outer side of the inner electrode, and an inorganic solid electrolyte and the water-swellable polymer electrolyte electron non-conductive protective layer comprising a imperforate layer and the polymer porous layer surrounding the outer surface of the imperforate layer comprising;
[50]
Electronic non-conductive support that surrounds the outside of the electron non-conductive protection layer;
[51]
Isolation layer surrounding the outside of the electron non-conductive support; And
[52]
It relates to a flexible secondary cell containing an outer electrode having an overall outside the house and the outer electrode layer surrounding the outer side of the isolation layer surrounding the outside of the outer electrode layer.
[53]
17 embodiment, in the 16th embodiment,
[54]
The inorganic solid electrolyte is related to the oxide-based, phosphate-based, nitride-based, sulfide-based, or a flexible secondary battery comprising a mixture of two or more of them.
[55]
18th embodiments, according to claim 16 or 17 embodiment,
[56]
The polymer electrolyte having the above swelling property relates to a polyolefin, polyester, polyacrylic, polyamide-based, polyurethane-based, cellulose-based, carbohydrate-based, polyol, or a flexible secondary battery comprising a mixture of two or more of them.
[57]
19th embodiments, according to claim 16 to which one embodiment of the eighteenth embodiment,
[58]
The electron non-conductive support is a winding spacing of the electron non-conductive, and the wire-like substrate wound around the outer side of the protective layer, and the winding of the 100㎛ to 3mm thickness of the wire-like support, the winding of a wire-like support ( pitch) is directed to a 1㎛ 1cm to a flexible secondary cell.
[59]
Another aspect of the present invention provides a flexible secondary battery according to an embodiment.
[60]
20 embodiment are the
[61]
One, two or more electrodes provided inside the inner electrode layers containing - inside the collector and the lithium surrounding the outer side of the power generating body inside the house;
[62]
The two or more internal electrode electron non-conductive protective layer having a porous polymeric layer that imperforate layer surrounding each of the outer and surrounds the outer surface of the imperforate layer;
[63]
Electronic non-conductive support that surrounds the outside of the electron non-conductive protection layer;
[64]
Isolation layer surrounding the outside of the electron non-conductive support; And
[65]
Relates to a containing, the flexible rechargeable battery; having a total outside the house and the outer electrode layer surrounding the outer side of the isolation layer surrounding the outside of the outer electrode layer outer electrode.
Effects of the Invention
[66]
Lithium electrode according to the present invention may be provided with a flexibility, as having a total patterned home uneven structure to prevent the electrode structure collapse of the volume expansion of the lithium metal, imperforate layer and the electron non-conductive consisting of polymeric porous layer by inhibiting growth of lithium dendrite non-uniform, as a protective layer, is improved in safety can exhibit excellent life characteristics and rate (rate) characteristic.
Brief Description of the Drawings
[67]
Figure 1a to 1e schematically shows a different embodiment of the lithium electrode in accordance with one embodiment of the invention.
[68]
Figure 2 schematically shows a structure of the electron non-conductive protection layer includes a lithium electrode according to an embodiment of the present invention.
[69]
Figure 3a is an electron non-conductive protective layer of lithium electrode according to the present invention is to show a direction of growth of lithium dendrites those containing polymeric porous layer.
[70]
Figure 3b is to show the direction of growth of the lithium dendrite when the polymer member porous layer on the electronic non-conductive protection layer.
[71]
Figure 4 schematically shows a structure of a flexible rechargeable battery according to one embodiment of the present invention.
[72]
Figure shows a cross-section of the flexible secondary battery according to the fifth embodiment of the present invention.
[73]
Figure 6 shows the definition of the term "pitch (pitch)" used in the present invention.
[74]
Figure 7 shows that the pitch interval of the wire-like electron non-conductive substrate having the flexible rechargeable battery according to one embodiment of the present invention can be controlled.
[75]
Figure 8 illustrates the subject to the thickness of the wire-like electron non-conductive support, as shown in Figure 7 control.
[76]
Figure 9a to 9c shows a cross section of a flexible rechargeable battery comprising at least two internal electrodes according to another embodiment of the invention.
[77]
Figure 10 schematically shows a shape twisted in a helical manner to the, cross each other, the three wire-like internal electrodes provided on the flexible rechargeable battery according to another embodiment of the invention.
Mode for the Invention
[78]
With reference to the drawings the present invention will be described in detail. 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.
[79]
Further, in the configuration shown in the examples and figures disclosed herein it is different in a not intended to limit the scope of the present merely nothing but the embodiment most preferred embodiment of the present invention invention can be made thereto according to the present application point It should be understood that there are equivalents and modifications.
[80]
[81]
Figure 1a to 1e schematically shows a different embodiment of the lithium electrode in accordance with one embodiment of the invention.
[82]
Figure 1a to see to 1e, the lithium electrode in accordance with one embodiment of the invention (100, 200, 300, 400, 500) is a current collector having a concave-convex structure (110, 210, 310, 410 having a top surface , 510); The lithium metal layer located on the outside of the entire except for the upper face of the concave-convex structure section in the house (120, 220, 320, 420, 520); Wherein the electron non-conductive protective layer located on the outside of the lithium metal layer (130, 230, 330, 430, 530); And a lithium ion isolation layer (140, 240, 340, 440, 540) located on the upper side of the upper side and the electron non-conductive protection layer on the top surface and the lithium metal layer of the textured structure of the current collector. The lithium ion isolation layer may be formed only on the top surface of the uneven structure of the current collector. Also inside the growth direction, even if the electron non-conductive protective layer is also, passing the lithium ions, but the pores are no lithium dendrite is imperforate layer 31 and the lithium dendrites which are capable of inhibiting the growth growth as shown in Fig. 2 and a porous polymeric layer 32 can be adjusted to.
[83]
The, term "outside" as used herein is a portion as meaning the outer region of the part, including both the portion and the portion to be spaced apart is formed in the abutting surface of the section, and the latter is separated from the portion forming in addition there is another layer may be interposed between.
[84]
The present invention, the term "upper" as used means bubunreul located at the top in the height direction of the section.
[85]
, The term "imperforate layer" as used herein means the free (無) the pores in the form of a layer with no pores, and in turn defined by a method described later.
[86]
In the present invention, the collector used for the lithium electrode has a pattern of concave-convex structure having a top surface. The concave-convex structure may be provided with grooves formed in the protrusion, and the protrusion side surface formed upwardly of the collector portion, or a vertical cross section the pawl portion selected from a rectangle, a trapezoidal shape, cross shape, and a polygonal shape, the vertical section of the groove portion It may be selected from a semi-circular, fan-shaped, triangular, rectangular, dumbbell-shaped, polygonal.
[87]
In this way, a patterned in a variety of forms of uneven structure collector is that over the electrode layer and the other forming the functional layer to the outside and the upper direction and can provide a three-dimensional electrode, through a pattern to control the growth direction of the lithium dendrite you can and can form a pattern and to a function to buffer the volume expansion of the electrode takes place in the charge / discharge process in accordance with the space formed between the respective concave-convex structure which prevents collapse of the electrode structure. Further, it is possible to give flexibility to the battery during use of the whole made up of the patterned house.
[88]
The concave-convex structure may be formed using conventional patterning method known. For example, house a coat the entire of a patterned film on, and immersing the entire coated house the etching solution suitable for the entire material of the house etching the current collector and then, by removing the patterned film, forming a pattern on the collector can do. Further, the addition may be subject to a variety of patterning method.
[89]
The concave-convex structure are one and obtain the average width, average height of from about 1 to about 5 to 5,000㎛ 5,000㎛ constituting the fine pattern, it is not particularly limited.
[90]
The current collector is stainless steel, aluminum, nickel, titanium, sintered carbon, copper; Carbon, nickel, titanium or silver on the surface-treated stainless steel; Aluminum-cadmium alloy; The surface-treated with a conductive material, a non-conductive polymer; Or it may be one made of a conductive polymer. When the lithium electrode is used as the cathode, it is preferable to use a copper material of the collector.
[91]
[92]
In the present invention, the lithium metal (120, 220, 320, 420, 520) is formed on the current collector, wherein depositing the lithium-based active material that can be implemented with high capacity to a portion other than the top surface of the concave-convex structure, electroplating or lamination may be formed by. The deposition, electroplating, and laminating can be performed in a variety of ways known in the art.
[93]
The lithium metal may have a thickness of 1 to 2,000㎛, the thicker the thickness the greater the reversible negative electrode capacity.
[94]
To the lithium-based active material may be an oxide, in particular lithium used in the lithium, lithium oxide, a lithium alloy and a lithium alloy.
[95]
[96]
In the present invention, the electron non-conductive protective layer is formed on the surface of the lithium metal layer 2, the electron non-conductive protective layer transfer lithium ions and imperforate layer 31 and the polymer without porosity porous layer (32 ) has a double layer structure comprising a.
[97]
The imperforate layer 31 and the polymer porous layer 32 is here composed of materials that do not conduct both electronic and has an electronic non-conductive.
[98]
By having the imperforate layer 31 and the polymer porous layer (32) is electron non-conductive in the present invention, developing the Li ions from / into the lithium metal intercalation / deintercalation to be reacted with the electron deposition (deposition), that is lithium Den can prevent the growth of Dendrite.
[99]
The imperforate layer 31 is a layer with lithium ion conductivity even without the former can be delivered by the present invention.
[100]
In the present invention, imperforate layer "is as measured within the true density imperforate layer in the following way, the value of the true density of 1.8 g to 2.1 / cm 3 to a.
[101]
[102]
To the true density it can be measured by the following method:
[103]
In accordance with methods prescribed in JIS R7212, it was measured using butanol. It describes the outline below.
[104]
With a volume of about 40 mL side pipe attached to weigh accurately the mass (m1) of bijungbyeong. Then, after the sample in the bottom thereof into a flat so as to have a thickness of about 10 mm, weigh accurately the mass (m2). To this was added quietly 1-butanol, and from the bottom with a depth of 20 mm. Then, it was added a slight vibration in bijungbyeong, after confirming that the generation of missing large bubbles, placed in a vacuum desiccator (desiccator), and to gradually exhaust 2.0~2.7kPa. Maintained for 20 minutes to the pressure, and after the generation of the bubbles stopped, taken out, immersed for more than 15 minutes (those that are adjusted to 30 ± 0.03 ℃) again filled in 1-butanol, and the stopper constant temperature water bath, 1-butanol Turn the par value of the mark. Then, remove it and then cooled to room temperature, good wiping the outside, weigh accurately the mass (m4). The filled and then, only the 1-butanol at the same bijungbyeong, in the same manner as described above by dipping into a water bath, by aligning the mark, a measure of the mass (m3). Further, immediately prior to use by boiling takes the removal of the dissolved gas in bijungbyeong distilled water, before the same was immersed in a constant temperature water bath, by aligning the mark, a measure of the mass (m5). True density (ρBt) is calculated by the following equation.
[105]
[1]
[106]
[107]
(Wherein, d is the density (0.9946) at the 30 ℃ water.)
[108]
[109]
Specifically, the imperforate layer may comprise an inorganic solid electrolyte and an electrolyte-swelling (swelling) polymer.
[110]
The imperforate layer 31 in the present invention is to be formed on the outside of the lithium metal thin film by coating method of deposition, coating, lamination and the like.
[111]
The imperforate layer in the present invention is a non-pore type, and more particularly, the true density value is 1.8 g to about 2.1 / cm 3 as the case of, can be formed by a CIP process, which will be described later.
[112]
The imperforate layer may have a thickness of 1 to 500nm. In this way, the imperforate layer may according to the thickness of thin film coating layer of, even if the pore can be a transfer of lithium ions.
[113]
Furthermore, the imperforate layer is in the range of 0.1 to 1 GPa, preferably from 0.8 to may have a modulus (modulus) of 1 GPa, in this case the imperforate layer is also suppressed to a physical growth of lithium dendrite by securing a certain strength can.
[114]
Furthermore, the imperforate layer E (e because it is non-conductive electron - ) can be by having a conductive property is not, effectively suppressed than the growth of lithium dendrites on the surface of the layer. If, if the organic / inorganic composite inorganic gongcheung this have electron conductivity, Li + the electron (e - ) is reduced to meet a large amount of Li in order to stabilize the reduced interfacial + is involved in the irreversible reaction, the lithium dendrite is If you grow Electronics (E - ) wall thickness disparity is due to the results in the generation of non-balanced dendrites can cause a large amount Dead Li. This phenomenon causes a degradation of life characteristics after all cells.
[115]
In the imperforate layer, an inorganic solid electrolyte and an electrolyte-swelling (swelling) polymer is 70:30 to 98: 1, or 75: 25 to 95: 5, or 80: 20 to 90: may be included in a ratio of 10, the value without conduction electrons in a range excellent in the effect of passing of lithium ions.
[116]
The inorganic solid electrolyte and acts as an intermediary for transmitting lithium ions, wherein the inorganic solid electrolyte may include an oxide-based, phosphate-based, nitride-based, sulfide-based, or a mixture of two or more of them. For example, the oxide-based inorganic solid electrolyte is a lithium-lanthanum-titanium-oxide (lithium lanthanum titanate, LLTO) based, lithium-lanthanum-zirconium oxide (lithium lanthanum zirconium oxide, LLZO) system, receiving cone (lithium super ionic conductor, LISICON ) type, and is any one selected from the group consisting of and mixtures thereof, wherein the phosphate-based inorganic solid electrolyte is a lithium-aluminum-titanium-phosphate (LATP) based, lithium-aluminum-germanium-phosphate (LAGP) based, and mixtures thereof one, and wherein the nitride-based inorganic solid electrolyte LiPON (lithium phosphorous oxynitride), the sulfide-based inorganic solid electrolyte is selected from the group consisting of the Li 10 GeP 2 S 12 , Li 2 S-P 2 S 5 , Li 2 S-P 2 S 5 -LiI, Li 2 S-P 2 S 5 -Li 2 O, Li 2 S-P 2 S 5 -Li 2 O-LiI, Li 2 S-SiS 2 , Li 2 S-SiS 2 -LiI, Li 2 S-SiS 2 -LiBr, 2 S-SiS 2 -LiCl, Li 2 S-SiS 2 -B 2 S 3 -LiI, Li 2 S-SiS 2 -P 2S 5 -LiI, Li 2 S-B 2 S 3 , Li 2 S-P 2 S 5 -ZmSn (stage, m, n is a positive number, Z is any one of Ge, Zn, Ga), Li 2 S-GeS 2 , Li 2 S-SiS 2 -Li 3 PO 4 , Li 2 S-SiS 2 -LixMOy (in this example, x, y are positive numbers, M is, P, Si, Ge, B , Al, Ga, in of which is one), and may include any one selected from the group consisting of a mixture thereof.
[117]
The electrolyte water-swellable polymer is the swelling (swelling) development increasing the bulk by absorbing the electrolytic solution by performing, it allows transmission of lithium ions from the lithium metal surface to effectively suppress the formation of lithium dendrites arising from the interface between the lithium metal the side reactions can be minimized.
[118]
The electrolyte water-swellable polymer is swelled in the electrolyte and possible conduction of lithium ions, the electrons do not conductive polymer, such as polyolefin, polyester, polyacrylic, polyamide-based, polyurethane-based, cellulose-based, carbohydrate-based, polyol of, or both may comprise a mixture of two or more. More specifically, as the polymer is swollen in the electrolytic solution, polyvinylidene fluoride-hexafluoropropylene (polyvinylidene fluoride-co-hexafluoropropylene), polyvinylidene fluoride-trichlorethylene (polyvinylidene fluoride-co-trichloroethylene), polymethyl methacrylate rate (polymethylmethacrylate), polybutyl acrylate (polybutylacrylate), polyacrylonitrile (polyacrylonitrile), polyvinylpyrrolidone (polyvinylpyrrolidone), polyvinyl acetate (polyvinylacetate), ethylene vinyl acetate copolymers (polyethylene-co-vinyl acetate) polyethylene oxide (polyethylene oxide), polyarylate (polyarylate), cellulose acetate (cellulose acetate), cellulose acetate butyrate (cellulose acetate butyrate), cellulose acetate propionate (cellulose acetate propionate), cyanoethyl pullulan (cyanoethylpullulan ), polyester non-cyanoethyl Carbonyl alcohol (cyanoethylpolyvinylalcohol), cyanoethyl cellulose (cyanoethylcellulose),
[119]
Furthermore, the imperforate layer may further include a dielectric non-conductive inorganic material to the mechanical strength and secure the ionic conductivity of the protective layer.
[120]
In the dielectric-conductive inorganic material is Al 2 O 3 , SnO 2 , Cu 3 N 2 , CeO 2 , MgO, NiO, CaO, ZnO, ZrO 2 , Y 2 O 3 , TiO 2 , SiC, Li 3 of N, or their 2 may include more thereof.
[121]
[122]
On the other hand, the polymer porous layer serves as the electrolyte carrier for supplying a sufficient electrolyte solution to the electrode surface, may be formed in a manner of laminating a polymer film having a porous structure, while the electrolyte-swelling on the outside of the imperforate layer, the imperforate layer and at the same time or it may be sequentially formed .
[123]
The porous polymeric layer can have a thickness of 1 to 1,000 ㎛. That is, a porous polymer layer can be formed to be thicker than that of the imperforate layer, bringing the flexible characteristic when the pressure is applied in the thickness range excused the contraction in the height direction can minimize its effects.
[124]
Polymer contained in the porous polymer layer may be not particularly limited if you can have an electrolyte swellable, given a porous structure through a phase separation polymer, and a typical example is polyurethane (polyurethane) having a sponge-like structure.
[125]
The polymer porous layer can suppress the lithium ions are non-uniformly supplied with an adequate supply of the electrolyte, a lithium metal surface by swelling, as including a polymer having a porous structure, yet water-swellable electrolyte. Moreover, when the lithium dendrite, which due to the imperforate layer with the concentration of the modulus and the stress that is internal cracks will occur or, insufficient transmitted through the imperforate layer to be grown, the polymer porous layer has a porous structure, the growth orientation of the lithium dendrite a it can be guided to the inner surface of the counter electrode side, and the polymer porous layer non-through.
[126]
For example, referring to Figure 3a and 3b, when the electronic non-conductive protective layer 230 formed on the lithium metal layer 220 containing both the imperforate layer 31 and the polymer porous layer 32 (Fig. 3a), the by inducing the growth of the lithium dendrite growth transmitted through the imperforate layer 31 from the lithium metal layer 220 to the inside along the surface of the polymer porous layer (32), by lithium dead light is transmitted through a separator (250) relative It can be prevented from contacting the electrodes 260. Specifically, the lithium dendrite in accordance with the polymer porous layer 32 having an asymmetrical structure that represents the interface between the pore size is relatively large and toward the upper pore size small form or in the form of the opposite of the imperforate layer 31 It can be induced to grow into the porosity of the polymer layer 32. From this, it can be delayed short-circuit the battery, you can naturally detect a change in the battery before the battery short-circuit occurs as battery performance is rapidly degraded. This variation in the cell may be, and can be easily monitored by the cell internal resistance, improving the safety of the battery when using the explosion.
[127]
On the other hand, if the electron non-conductive polymeric porous layer in the protective layer is absent (Fig. 3b) is in the lithium dendrite transmitted through the imperforate layer 31 from the lithium metal 220 rapidly separator grown in 'free-standing' form after having passed through the 250 by being brought into contact with the counter electrode 260, and the generated electric short circuit, in the interface between the lithium metal and imperforate layer 31, the growth of the dead lithium (dead Li) increases resulting in a faster cell degeneration do.
[128]
Preferably, the electron non-conductive protective layer may have a total thickness of 1 to 1,000 ㎛.
[129]
[130]
In the present invention, the lithium ion isolation layer (140, 240, 340, 440, 540) house the upper end surface of the concave-convex structure overall, located on the upper side of the upper side and the electron non-conductive protective layer of lithium metal, or collector unevenness of It may be located only on the top surface of the structure.
[131]
The lithium ion isolation layer may comprise failing to transfer lithium ions having an electron non-conductive polymer, such as polyolefin-based, polyester-based, polyamide-based, polyurethane-based, or a mixture of two or more of them, the use of the polymer and it can be formed into a film shape by a method such as coating, vapor deposition.
[132]
These lithium ion isolation layer can prevent the growth of lithium dendrites, which by inhibiting the reaction of the lithium ion electron failure to reach, depending on having the electron non-conductive, growing toward the image side.
[133]
That is, the lithium ion isolation layer in the present invention is to simultaneously with transmission of the lithium ions also inhibit electrons does not move.
[134]
These lithium ion isolation layer is grown vertically from the top surface, the cross section of the collector, as located on the upper side of the upper side and the electron non-conductive protective layer of lithium metal, or where only the top surface of the current collector uneven structure of the entire uneven surface can house the growth of lithium dendrites that can be effectively suppressed. In other words. Even this, according to one aspect of the invention, the lithium dendrite by lithium ion isolation layer grown while inhibiting the growth in the vertical, Den lithium by conducting the protective layer described above electronic vision Dendrite, between the lithium-metal layer and the imperforate layer position hageo Here, the porous polymer cheungwa inside the porous polymer layer can be derived to be mainly parallel to the growth. Accordingly can delay the short circuit of the battery, it is possible to improve the life characteristics.
[135]
Specifically, the lithium ion isolation layer 1) collector uneven structure without any layer is also not covered of the lithium metal and the electron non-conductive protection layer on the upper surface of the entire uneven surface can house that is exposed to the outside, 2) E-Vision conductive protective layer does not covered, the collector of the concave-convex structure the upper side of the lithium-metal layer at the top surface and the same direction, and 3) the collector of the concave-convex structure upper surface and an electron non-conductive upper side of the protective layer in the same direction It is formed on both can be located.
[136]
Further, the lithium ion isolation layer, if having a thickness capable of controlling the diffusion of the lithium ions is not particularly limited. For example, the lithium ion isolation layer may be thicker than the thickness of the organic / inorganic composite gongcheung weapons.
[137]
[138]
Lithium metal electrode according to the present invention can be prepared in the following way, without being limited thereto.
[139]
First, prepare a current collector having a concave-convex structure having a top surface. The concave-convex structure may be formed by using a typical patterning method.
[140]
Thereafter, to form the lithium metal on the outer surface of the portion except for the upper face of the concave-convex structure in the current collector. The lithium metal layer may be formed by vapor deposition, plating, or lamination of lithium active material.
[141]
Thereafter, the outside of the lithium-metal layer coating and drying for the imperforate layer forming slurry to form a former (前) imperforate layer. The slurry for forming the imperforate layer is prepared by stirring and then added to the inorganic solid electrolyte and the electrolyte above the water-swellable polymer in a solvent is coated and dried in a conventional manner.
[142]
Then, the drying and coating the slurry for forming the porous polymeric layer on the outer side of the former (前) imperforate layer. It is prepared by introducing the above-mentioned polymer for forming the porous polymeric layer slurry in a solvent. The polymer is a polymer having a porous structure while having an electrolyte swellable.
[143]
Thereafter, the current collector uneven structure top surface, located at the upper side of the upper side and the electron non-conductive protective layer of lithium metal, or of, the coating and drying a slurry for a lithium ion isolation layer formed on the top surface of the current collector textured structure. The coating and drying is possible in a conventional manner and, like the lithium ion isolated slurry for forming a layer that do not pass the lithium ion has the electron non-conductive polymer, such as polyolefin, polyester-based, polyamide-based, polyurethane-based It can be prepared by using the polymer.
[144]
Finally, the former (前) introducing lithium metal electrode to the lithium ion isolation layer by using a cold isostatical press method (CIP, Cold Isostatic Pressing) forms an imperforate layer.
[145]
"Cold isostatical press method" in the present invention is that the former (前) the former (前) sealed to the container of the lithium metal electrode with rubber seal and a vacuum pump that may be evenly distributed pressure lithium metal electrode filled will apply isotropic pressure to the vessel.
[146]
The isostatic pressure can be from atmospheric pressure to 300 MPa.
[147]
Accordingly, the true density of 1.8 g to 2.1 / cm 3 it is possible to form a layer of imperforate.
[148]
[149]
The lithium electrode of the present invention as described above comprises as a whole a patterned house a convex-and-concave structure, lithium metal, electron non-conductive protective layer imperforate layer and the polymer porous layer, and a lithium ion isolation layer, the growth of lithium dendrites It can be suppressed, and even if inevitably lithium dendrite growth by inhibiting the growth by controlling the growth direction, and non-uniform, to improve the safety and improve the life characteristics and rate characteristics therefrom. Further, according to the lithium electrode of the present invention uses the entire patterned house comprises a flexible take a three-dimensional structure, when the volume expansion of the lithium electrode the space between the pattern number by a buffer action to prevent an electrode structure collapse have.
[150]
[151]
Accordingly, another aspect of the invention relates to a lithium secondary battery including the lithium electrode. Specifically, the lithium secondary battery may be produced by injecting a lithium salt-containing electrolyte solution in the electrode assembly including a separator interposed between the cathode and the anode, and the cathode and the anode, a lithium electrode according to the present invention is used as the anode It can be used.
[152]
At this time, the lithium secondary battery may be of a cylindrical, prismatic, pouch-type, a flexible type, or coin.
[153]
In addition, as the lithium electrode in accordance with the present invention, an electronic non-conductive protection layer, when the configuration of the electrode assembly, the separator may be omitted, if necessary.
[154]
Another embodiment of the invention relates to a flexible secondary battery comprising the above-mentioned lithium electrode. Specifically, the lithium electrode is available as an internal electrode of a cable-type secondary battery, the configuration other than the lithium electrode can be replaced by the contents of the flexible secondary battery to be described later.
[155]
The cathode has a component that is commonly used in the cathode of the lithium secondary battery may be used both. Specifically, usable examples of the cathode active material is LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4 , LiFePO 4 , and LiNi 1 -xy- z Co x M1 y M2 z O 2(M1 and M2 are each independently selected from Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, at least one selected from the group consisting of Mg and Mo, x, y and z are oxides independently of each other as the atomic fraction of the element composition of 0≤x <0.5, 0≤y <0.5, 0≤z <0.5, 0
Documents
Orders
Section
Controller
Decision Date
Application Documents
#
Name
Date
1
201917029693-IntimationOfGrant29-02-2024.pdf
2024-02-29
1
201917029693.pdf
2019-07-23
2
201917029693-PatentCertificate29-02-2024.pdf
2024-02-29
2
201917029693-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [23-07-2019(online)].pdf
2019-07-23
3
201917029693-STATEMENT OF UNDERTAKING (FORM 3) [23-07-2019(online)].pdf
2019-07-23
3
201917029693-FORM 3 [16-01-2024(online)].pdf
2024-01-16
4
201917029693-Written submissions and relevant documents [29-12-2023(online)].pdf
2023-12-29
4
201917029693-PROOF OF RIGHT [23-07-2019(online)].pdf
2019-07-23
5
201917029693-POWER OF AUTHORITY [23-07-2019(online)].pdf
2019-07-23
5
201917029693-Correspondence to notify the Controller [13-12-2023(online)].pdf