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Electrode Assembly And Lithium Secondary Battery Comprising Same

Abstract: The present invention relates to an electrode assembly and a lithium secondary battery including the same, the electrode assembly comprising a cathode current collector, a cathode active material layer, a separation membrane, an anode active material layer, and an anode current collector, which are sequentially stacked, wherein: the cathode active material layer, the separation membrane, and the anode active material layer have a plurality of through-holes formed to pass therethrough; the cathode current collector includes a first sheet type current collector, and a plurality of first pillar type current collectors extending in the thickness direction of the current assembly from the first sheet type current collector and passing through some of the plurality of through-holes; and the anode current collector includes a second sheet type current collector, and a plurality of second pillar type current collectors extending in the thickness direction of the electrode assembly from the second sheet type current collector and passing through the remaining through-holes excluding some of the plurality of through-holes.

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Patent Information

Application #
Filing Date
14 August 2019
Publication Number
52/2019
Publication Type
INA
Invention Field
ELECTRICAL
Status
Email
IPO@KNSPARTNERS.COM
Parent Application
Patent Number
Legal Status
Grant Date
2024-02-21
Renewal Date

Applicants

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

Inventors

1. SONG, Joo-Yong
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122
2. LEE, Myung-Ki
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122
3. AHN, Ji-Hee
LG Chem Research Park, 188, Munji-ro, Yuseong-gu, Daejeon 34122

Specification

Art [1]The present invention relates to a rechargeable lithium battery including the electrode assembly him and, more particularly, a positive electrode, a separator and a negative electrode are laminated with a novel form of the electrode assembly and a lithium secondary battery comprising them. [2]This application claims the priority based on the Korea Patent Application No. 10-2017-0081480, filed on June 27, 2017, and all contents disclosed in the specification and drawings of that application are incorporated in this application. BACKGROUND [3] Recently, increasing interest in energy storage technology. Mobile phones, camcorders and notebook PC, furthermore there is a commitment to research and development of cell shape more and more applications as the expansion of electric vehicles to energy. The electrochemical device is a field most attention in this respect, in particular, the recent tendency to miniaturization and weight saving of electronic devices, development of a secondary battery as a rechargeable battery with a small light-weight and high capacity has become a focus of attention. [4] The secondary battery has been his many performance, the development of things, especially the output is greatly improved as the electrode active material by continuous research. The lithium secondary battery developed in the early 1990's from the secondary batteries that are currently being applied has been spotlighted as a high operating voltage, the energy density is greater advantages over conventional batteries, such as Ni-MH. [5] This lithium secondary battery has a positive electrode, a separator, a negative electrode, is composed of an electrolyte, the lithium ions emitted from the positive electrode active material by first filling the negative electrode active material, for example, while inserted in the carbon particles, and reciprocating the both electrodes, such that desorption again during a discharge energy due to the role of forwarding it is possible to charge and discharge. [6] As the development of technology and demand for mobile devices has increased the demand for secondary batteries as energy sources increased sharply. The secondary of the battery has a high energy density and voltage, long cycle life, self-discharge rate are commercially available and widely used low-lithium secondary battery. In addition, the growth of electric vehicles, hybrid electric vehicles, such as adopting the high capacity battery device market that can replace vehicles using fossil fuel, such as a gasoline car, diesel car of the main causes of air pollution in accordance with the interest in environmental issues grows as the demand for high-capacity battery enlarged base according to the actual circumstances that require a high capacity and design of the electrodes for the production of a lithium secondary battery having high energy density, high output, and high discharge voltage as a power source for these devices. [7] On the other hand, increases the amount of the electrode active material for high capacity design of the electrode, and the loading electrode of the electrode is thicker (the loading amount of about 6 mAh / cm 2 or more), this is attempted, in such a high load electrode implementation, the high-loading there is according coating cracks, the electrode active material is desorbed during the electrode coating unevenness and the electrode take-up of the loading according to the viscosity of the slurry, such as developing a problem. Detailed Description of the Invention SUMMARY [8] Therefore, object of the present invention is to provide a lithium secondary battery comprising a novel form of the electrode assembly, and for him to prevent cracking and desorption phenomenon of the electrode active material layer. Problem solving means [9] According to an aspect of the invention, the cathode current collector, the positive electrode active material layer, a separator, a negative electrode active material layer and the negative electrode collector has an electrode assembly laminated, in turn, the positive electrode active material layer, the separator and the well passes through the negative electrode active material layer and a plurality of through holes are formed, the positive electrode current collector, the first sheet-like collector and wherein the first sheet-like house from the current is extended in the thickness direction of the electrode assembly, passing through a portion of the plurality of through-holes include the entire plurality of first pole collector, and the negative electrode collector, the second sheet-like current collector and the second sheet-like house from the current is extended in the thickness direction of the electrode assembly, wherein one of the plurality of through-holes an electrode assembly comprising the entire plurality of the second columnar house passing through the rest of the through-holes other than the through hole part is provided. [10] At this time, the whole of the plurality of first columnar collector, and extend in the thickness direction of the electrode assembly, it may be formed so as to reach the whole of the second sheet-like house. [11] And, the plurality of second columnar collector, and extend in the thickness direction of the electrode assembly, may be formed so as to reach the whole of the first sheet-like house. [12] On the other hand, the plurality of first-type first pole current collector is the positive electrode and the active material layer through the close contact with the inner circumferential surface of the formed through hole, the whole of the plurality of second pole current collector is, the inner peripheral surface of the through hole formed in the anode active material layer and it may be in close contact with the penetrating. [13] Here, the whole of the plurality of first pole collector, the cathode and the inner circumferential surface of the through hole formed in the active material layer and spaced through, the whole of the plurality of second columnar collector, an inner circumferential surface of the through-holes formed in the positive electrode active material layer They are spaced apart and may be penetrating. [14] Then, the whole of the plurality of first pole current collector, the negative electrode and the active material layer through the close contact with the inner circumferential surface of the formed through hole, the whole of the plurality of second columnar collector, an inner circumferential surface of the through-holes formed in the positive electrode active material layer adhesive penetrates in, and the plurality of first pole current collector, the negative electrode active material layer and comprising a first insulating layer formed on the surface of the abutting portion, the plurality of second pole current collector, the positive electrode active material It may be to include a second insulating layer formed on the surface of the layer and the abutting portion. [15] At this time, the first insulating layer and the second insulating layer may be, independently, a varnish coating, the dielectric polymer coating layer or insulating inorganic coating layer with each other. [16] On the other hand, the first plurality of pillar-like house part through the whole of the through-holes and the rest of the through-holes to the whole of the plurality of second columnar through-house can be arranged are mutually alternating. [17] Then, the positive electrode active material layer in the plurality of through-holes have been formed, may be injected with the positive electrode active material slurry to an electrode molded in a plurality of columns are formed, and then, hot-pressing the resultant positive electrode active material slurry. [18] In addition, the negative electrode active material layer in the plurality of through-holes have been formed, the mold may be in the electrode in a plurality of columns are formed, the injection of a negative electrode active material slurry, and then, hot-pressing the resultant negative electrode active material slurry. [19] According to another aspect of the invention, there is provided a rechargeable lithium battery including the electrode assembly of the present invention described above. Effects of the Invention [20] According to the invention, a plurality of through-holes formed in the electrode coating, since the entire house is columnar through-electrode assembly is manufactured, it is possible to produce an electrode assembly for a solid block form. [21] And, by laminating a positive electrode current collector, the positive electrode active material layer, a separator, a negative electrode active material layer and the negative electrode current collector in block form because it can produce an electrode assembly it can be reduced process costs. [22] Moreover, a plurality of pillar-like current collector penetrating through the electrode coating it in close contact with the inner peripheral surface of the through-holes formed in the electrode active material layer, the internal resistance of the electrode can be reduced. Brief Description of the Drawings [23] Following figures attached to this specification are intended to illustrate preferred embodiments of the present invention, the components which serve to further understand the teachings of the present invention with the content of the above-described invention, the invention is only to details set forth in those figures is limited shall not be interpreted. [24] 1 is a view showing a positive electrode current collector and the anode current collector in accordance with an embodiment of the present invention. [25] 2 is a view schematically showing a positive electrode active material layer, a separator and an anode active material layer formed with a plurality of through-holes in accordance with an embodiment of the present invention. [26] Figure 3 is a schematic view of an electrode assembly produced according to one embodiment of the present invention. [27] Figure 4 is a schematic view of the electrode mold for producing an electrode active material layer according to an embodiment of the present invention. [28] Reference Numerals [29] 100: electrode assembly [30] 110: positive electrode current collector [31] 111: first sheet-like current collector [32] 112: first columnar collector [33] 120: positive electrode active material layer [34] 130: Membrane [35] 140: negative electrode active material layer [36] 150: negative electrode current collector [37] 151: second sheet-like current collector [38] 152: second columnar collector [39] 160: through hole [40] 200: electrode mold Mode for the Invention [41] 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. [42] Thus, the configuration described in the specification is to merely nothing but a preferable embodiment of the invention not intended to limit the scope of the invention, the method for application point be various equivalents and modifications can be made thereto to that should be understood. [43] 1 is a view showing a positive electrode current collector and the anode current collector in accordance with one embodiment of the invention, Figure 2 is the positive electrode active material layer, a separator and a negative electrode active material formed with a plurality of through-holes in accordance with an embodiment of the present invention a view showing the layer schematically, Figure 3 is a schematic view of an electrode assembly produced according to one embodiment of the present invention. [44] Figures 1 to Referring to Figure 3, the electrode assembly 100 in accordance with an aspect of the present invention, the positive electrode collector 110, a positive electrode active material layer 120, a separator 130, a negative electrode active material layer 140 and a cathode collector 150 as the electrode assembly 100 stacked in sequence, wherein the positive electrode active material layer 120, a plurality of through-holes 160, which as well as passing through the membrane 130 and the anode active material layer 140 are is formed, the positive electrode collector 110, a first sheet-like collector 111, and the first sheet-like house and from the body (111) extending in the thickness direction of the electrode assembly 100, the plurality of through- ball 160 includes a plurality of first columnar collector 112 through any of a, and the anode current collector 150 is full, the second sheet-like current collector 151 and the second sheet-shaped house ( 151) being formed from the extension in the thickness direction of the electrode assembly 100, the plurality of through-holes 160 of the part of the through hole Plurality of penetrating the exception of the through-hole characterized in that it comprises a second pillar-shaped collector 152. The [45] Conventionally, the positive electrode current collector and the negative electrode made of a positive electrode coating negative electrode active material layer positive electrode, formed of a sheet-like cathode collector and, above it consisting of a formed on a sheet-like, across the membrane in the form of a sheet simply stacked in the form of It was a general electrode assembly. [46] For this general type of the electrode assembly, by increasing the positive electrode active material for high capacity design of the electrodes, when and the thickness of the electrodes thick to implement the loading electrode, and coating cracks of the loading, the viscosity of the electrode active material slurry this non-uniformity, etc., and the electrode take-up phenomenon during desorption of the electrode active material layer of the loading according to occur has been a problem. [47] However, according to the present invention, the electrode active material layer (120, 140) and the through whereby the electrode assembly 100 membrane plurality of through-holes 160 of the, pole current collector (112, 152) formed on a 130 since manufacture, and it can produce an electrode assembly for a solid block form. [48] And, each full 110 positive electrode current collector of the block type that is prepared in advance, by stacking the positive electrode active material layer 120, a separator 130, a negative electrode active material layer 140 and negative electrode collector 150, in turn, an electrode assembly ( can produce 100) it may cause the effect to decrease the process cost. [49] At this time, the first plurality of pillar-like collector 112, to pass through the through hole (160) of said plurality, and extend in the thickness direction of the electrode assembly 100, the other side electrodes of said second sheet-like current collector can be formed to reach the 151, and the plurality of second pole current collector 152, and extends through the plurality of through-holes 160, the thickness direction of the electrode assembly 100, It may be formed so as to reach the opposite electrode of the first sheet-like collector 111. [50] In this case, for the short circuit prevention between the electrodes, the first plurality of pillar-like collector 112, the second sheet-like current collector 151 and the abutting portions and the second plurality of pillar-like collector 152 is In the first sheet-like collector 111 and the abutting portion may be an insulating layer formed so as to cut off the electrical connection. [51] On the other hand, the whole 112 of the plurality of first pole current collector, the positive electrode coating portion through-holes 160 and through close contact with the inner peripheral surface, all (152) the second plurality of pillar-like house of the formed 120 It is, may be passing through in close contact with the inner peripheral surface of the through hole 160 formed in the negative electrode active material layer 140, so that, since each of the electrode current collector and the electrode active material layer is in contact area in an increase in the electrode internal resistance It can be reduced. [52] Here, for the short circuit prevention between the electrodes, the plurality of first pole current collector 112, but is in close contact the inner circumferential surface of the through hole 160 formed in the positive electrode active material layer 120, the anode active material layer (140 ) and the inner peripheral surface of the through-holes 160 may be spaced from the through, the plurality of second pole current collector 152 formed on the inner peripheral surface of the through hole 160 formed in the negative electrode active material layer 140 include, but close, spaced apart from the inner circumferential surface of the through hole 160 formed in the positive electrode active material layer 120 may be penetrating. [53] In addition, the first plurality of pillar-like collector 112, and the inner peripheral surface of the through hole 160 formed in the positive electrode active material layer 120, the inner peripheral surface of the through hole 160 formed in the negative electrode active material layer 140 it is possible that by close contact with the passing through, the second plurality of pillar-like collector 152, the inner peripheral surface and the cathode active material layer 120 of the through hole 160 formed in the negative electrode active material layer 140 may be passing through in close contact with the inner circumferential surface of the formed through-hole 160, at this time, for the short circuit prevention between the electrodes, the body (112) the first plurality of pillar-like home, the negative electrode active material layer 140 and the the may include a first insulating layer, the plurality of second pillar-shaped collector (152) formed on the surface of the abutting portion, a second insulating layer formed on the surface of the abutting portion and the positive electrode active material layer 120 can do. [54] At this time, the first insulating layer and the second insulating layer, can be independently a varnish coating or the like, the dielectric polymer coating layer or insulating inorganic coating layer with each other. [55] On the other hand, with regard to the arrangement of the first plurality of pillar-like house part through-hole of the whole penetration and the plurality of second pole current collector is the through hole of the other passing through the through hole of the part and the the through hole of the other are such that each can be separately packed arrangement to each other, a part, but are not particularly limited, the through-hole portion and the through hole of the rest of the can be arranged to be mutually alternated. Thus, since it is uniformly acting force to the entirety of said first plurality of pillar-shaped current collector and the plurality of second pole current collector, it is possible to assemble the more robust electrode assembly. [56] [57] Figure 4 is a schematic view of the electrode mold for producing an electrode active material layer according to an embodiment of the present invention. [58] Referring to Figure 4 if, the electrode active material layer with a plurality of through-holes of the present invention have been formed, injecting an electrode active material slurry to an electrode mold 200 in which a plurality of poles are formed, and then heating the electrode active material slurry was squeezed It may be the result. [59] Thus When producing an electrode active material layer of a block-type through the electrode mold, during storage of that Since placing it requires a stack, without winding, it may occur according to a conventional take-up Sikkim for storage of the electrode sheet electrode coating desorption phenomenon the can be fundamentally prevented. [60] At this time, the positive electrode active material slurry of the present invention is prepared by mixing the positive electrode active material, conductive material, binder, and solvent. [61] As the positive electrode active material may include a lithium-containing oxide, lithium-containing transition metal oxide may preferably be used. For example, Li x CoO 2 (0.5

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Application Documents

# Name Date
1 201917032839-IntimationOfGrant21-02-2024.pdf 2024-02-21
1 201917032839.pdf 2019-08-14
2 201917032839-PatentCertificate21-02-2024.pdf 2024-02-21
2 201917032839-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [14-08-2019(online)].pdf 2019-08-14
3 201917032839-STATEMENT OF UNDERTAKING (FORM 3) [14-08-2019(online)].pdf 2019-08-14
3 201917032839-8(i)-Substitution-Change Of Applicant - Form 6 [01-12-2022(online)].pdf 2022-12-01
4 201917032839-PROOF OF RIGHT [14-08-2019(online)].pdf 2019-08-14
4 201917032839-ASSIGNMENT DOCUMENTS [01-12-2022(online)].pdf 2022-12-01
5 201917032839-POWER OF AUTHORITY [14-08-2019(online)].pdf 2019-08-14
5 201917032839-PA [01-12-2022(online)].pdf 2022-12-01
6 201917032839-FORM 3 [26-07-2022(online)].pdf 2022-07-26
6 201917032839-FORM 1 [14-08-2019(online)].pdf 2019-08-14
7 201917032839-DRAWINGS [14-08-2019(online)].pdf 2019-08-14
7 201917032839-ABSTRACT [14-03-2022(online)].pdf 2022-03-14
8 201917032839-DECLARATION OF INVENTORSHIP (FORM 5) [14-08-2019(online)].pdf 2019-08-14
8 201917032839-CLAIMS [14-03-2022(online)].pdf 2022-03-14
9 201917032839-COMPLETE SPECIFICATION [14-03-2022(online)].pdf 2022-03-14
9 201917032839-COMPLETE SPECIFICATION [14-08-2019(online)].pdf 2019-08-14
10 201917032839-DRAWING [14-03-2022(online)].pdf 2022-03-14
10 201917032839-OTHERS-200819.pdf 2019-08-23
11 201917032839-FER_SER_REPLY [14-03-2022(online)].pdf 2022-03-14
11 201917032839-OTHERS-200819-.pdf 2019-08-23
12 201917032839-Correspondence-200819.pdf 2019-08-23
12 201917032839-OTHERS [14-03-2022(online)].pdf 2022-03-14
13 201917032839-Information under section 8(2) [11-03-2022(online)].pdf 2022-03-11
13 abstract.jpg 2019-09-04
14 201917032839-certified copy of translation (MANDATORY) [10-01-2020(online)].pdf 2020-01-10
14 201917032839-FORM 3 [25-01-2022(online)].pdf 2022-01-25
15 201917032839-FER.pdf 2021-10-18
15 201917032839-FORM 3 [14-02-2020(online)].pdf 2020-02-14
16 201917032839-FORM 3 [06-08-2021(online)].pdf 2021-08-06
16 201917032839-FORM 3 [13-08-2020(online)].pdf 2020-08-13
17 201917032839-FORM 3 [09-02-2021(online)].pdf 2021-02-09
17 201917032839-FORM 18 [19-04-2021(online)].pdf 2021-04-19
18 201917032839-FORM 18 [19-04-2021(online)].pdf 2021-04-19
18 201917032839-FORM 3 [09-02-2021(online)].pdf 2021-02-09
19 201917032839-FORM 3 [06-08-2021(online)].pdf 2021-08-06
19 201917032839-FORM 3 [13-08-2020(online)].pdf 2020-08-13
20 201917032839-FER.pdf 2021-10-18
20 201917032839-FORM 3 [14-02-2020(online)].pdf 2020-02-14
21 201917032839-certified copy of translation (MANDATORY) [10-01-2020(online)].pdf 2020-01-10
21 201917032839-FORM 3 [25-01-2022(online)].pdf 2022-01-25
22 201917032839-Information under section 8(2) [11-03-2022(online)].pdf 2022-03-11
22 abstract.jpg 2019-09-04
23 201917032839-Correspondence-200819.pdf 2019-08-23
23 201917032839-OTHERS [14-03-2022(online)].pdf 2022-03-14
24 201917032839-OTHERS-200819-.pdf 2019-08-23
24 201917032839-FER_SER_REPLY [14-03-2022(online)].pdf 2022-03-14
25 201917032839-DRAWING [14-03-2022(online)].pdf 2022-03-14
25 201917032839-OTHERS-200819.pdf 2019-08-23
26 201917032839-COMPLETE SPECIFICATION [14-03-2022(online)].pdf 2022-03-14
26 201917032839-COMPLETE SPECIFICATION [14-08-2019(online)].pdf 2019-08-14
27 201917032839-CLAIMS [14-03-2022(online)].pdf 2022-03-14
27 201917032839-DECLARATION OF INVENTORSHIP (FORM 5) [14-08-2019(online)].pdf 2019-08-14
28 201917032839-ABSTRACT [14-03-2022(online)].pdf 2022-03-14
28 201917032839-DRAWINGS [14-08-2019(online)].pdf 2019-08-14
29 201917032839-FORM 1 [14-08-2019(online)].pdf 2019-08-14
29 201917032839-FORM 3 [26-07-2022(online)].pdf 2022-07-26
30 201917032839-PA [01-12-2022(online)].pdf 2022-12-01
30 201917032839-POWER OF AUTHORITY [14-08-2019(online)].pdf 2019-08-14
31 201917032839-PROOF OF RIGHT [14-08-2019(online)].pdf 2019-08-14
31 201917032839-ASSIGNMENT DOCUMENTS [01-12-2022(online)].pdf 2022-12-01
32 201917032839-STATEMENT OF UNDERTAKING (FORM 3) [14-08-2019(online)].pdf 2019-08-14
32 201917032839-8(i)-Substitution-Change Of Applicant - Form 6 [01-12-2022(online)].pdf 2022-12-01
33 201917032839-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [14-08-2019(online)].pdf 2019-08-14
33 201917032839-PatentCertificate21-02-2024.pdf 2024-02-21
34 201917032839.pdf 2019-08-14
34 201917032839-IntimationOfGrant21-02-2024.pdf 2024-02-21

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