CN212303706U - Silicon-containing negative electrode sheet and lithium ion secondary battery comprising same - Google Patents
Silicon-containing negative electrode sheet and lithium ion secondary battery comprising same Download PDFInfo
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- CN212303706U CN212303706U CN202021365020.6U CN202021365020U CN212303706U CN 212303706 U CN212303706 U CN 212303706U CN 202021365020 U CN202021365020 U CN 202021365020U CN 212303706 U CN212303706 U CN 212303706U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model relates to a silicon-containing negative plate and lithium ion secondary battery containing the same. The silicon-containing negative plate comprises a current collector; a first adhesive polymer/inorganic conductive material porous composite layer disposed on one side of the current collector and a first silicon-containing negative electrode material layer disposed on the first adhesive polymer/inorganic conductive material porous composite layer. The utility model discloses a silicon-containing negative pole piece has solved the adhesion force problem and the negative pole of silicon-containing negative pole material and mass flow body and has fallen the whitewashed phenomenon, has promoted high capacity lithium ion secondary battery's cyclicity performance, can promote the volume energy density of battery simultaneously greatly.
Description
Technical Field
The utility model belongs to the lithium ion secondary battery field, concretely relates to lithium ion secondary battery who contains silicon negative pole piece and contain this negative pole piece.
Background
The negative electrode material (also called as negative electrode active material) is one of the important components of the lithium ion battery, and directly influences the key indexes of the battery, such as energy density, cycle life, safety performance and the like. Compared with a graphite cathode, the silicon-containing cathode material has obvious energy density advantage. The theoretical specific capacity of the graphite is 372mAh/g, and the theoretical specific capacity of the silicon-containing negative electrode material exceeds 10 times of the theoretical specific capacity and reaches 4200 mAh/g. The silicon-carbon composite negative electrode material can greatly improve the capacity of a monomer battery cell and increase the endurance mileage of the electric automobile.
However, the silicon particles are accompanied by volume expansion and contraction during lithium intercalation, which leads to particle pulverization and exfoliation, and particularly exfoliation of the silicon-containing negative electrode material layer from the current collector, and significant deterioration of cycle performance occurs. If in the size mixing of pole piece preparation process, directly increase the quantity of gluing, the quantity of negative pole material will reduce, and the glue volume of distributing on silicon particle surface can be many simultaneously, influences the electron conductivity of silicon to influence the embedding reaction rate of lithium ion, thereby influence the capacity and the multiplying power performance of battery.
To address the cycling performance of high capacity batteries, CN110148708A discloses a silicon-containing negative electrode sheet, which includes a current collector, a graphite coating near the current collector, and a silicon-containing coating far from the current collector. The technology aims to solve the problem that the silicon-containing coating falls off from the current collector, graphite is coated on the current collector, and then the silicon-containing coating is coated, so that the problem of cycle deterioration caused by the fact that silicon falls off from the current collector can be relieved. However, since the capacity of graphite is much lower than that of silicon, and the graphite electrode sheet also has a 10-15% volume expansion problem during charging and discharging, the volume energy density of the battery made of the negative electrode sheet is limited by the graphite material.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides a lithium ion secondary battery who contains silicon negative pole piece and contain this negative pole piece, silicon negative pole piece can solve above-mentioned silicon coating and follow the problem that the mass flow body drops owing to contain porous composite bed, can promote lithium ion secondary battery's cyclic capacity simultaneously.
In one aspect, the utility model provides a silicon-containing negative plate, it contains:
1) a current collector;
2) a first adhesive polymer/inorganic conductive material porous composite layer provided on one surface of the current collector; and
3) a first silicon-containing negative electrode material layer disposed on the first adhesive polymer/inorganic conductive material porous composite layer.
In an embodiment, the first adhesive polymer/inorganic conductive material porous composite layer may have a thickness of 0.02 to 12 μm, and the first silicon-containing negative electrode material layer may have a thickness of 0.02 to 150 μm.
In an embodiment, a thickness ratio of the first adhesive polymer/inorganic conductive material porous composite layer to the first silicon-containing anode material layer satisfies the following relationship: and a/b is not less than 3 and not more than 500, preferably not less than 5 and not more than a/b and not more than 300, wherein a represents the thickness of the first silicon-containing anode material layer, and b represents the thickness of the first adhesive polymer/inorganic conductive material porous composite layer.
In an embodiment, the silicon-containing negative electrode sheet further includes a second adhesive polymer/inorganic conductive material porous composite layer disposed on the other surface of the current collector, and a second silicon-containing negative electrode material layer disposed on the second adhesive polymer/inorganic conductive material porous composite layer.
In an embodiment, the first and second adhesive polymer/inorganic conductive material porous composite layers may independently have a thickness of 0.02 to 12 μm, and the first and second silicon-containing anode material layers may independently have a thickness of 0.02 to 150 μm.
In an embodiment, the first porous composite adhesive polymer/inorganic conductive material layer and the first silicon-containing anode material layer and the second porous composite adhesive polymer/inorganic conductive material layer and the second silicon-containing anode material layer have the following relationships in thickness: and a/b is not less than 3 and not more than 500, preferably not less than 5 and not more than a/b and not more than 300, wherein a represents the thickness of the first or second silicon-containing anode material layer, and b represents the thickness of the first or second adhesive polymer/inorganic conductive material porous composite layer.
In an embodiment, the current collector is made of a material selected from the group consisting of aluminum foil, copper foil, and an electronically conductive foil coated and/or deposited with copper, aluminum, and carbon.
In an embodiment, the current collector has a thickness of 2-25 μm.
In another aspect, the present invention provides a lithium ion secondary battery, which comprises the aforementioned silicon-containing negative plate.
Advantageous effects
The utility model discloses a silicon-containing negative plate with do not contain porous composite layer's the condition is compared, and this porous composite layer's addition can make silicon-containing negative material layer improve 0.5-100N/m, preferred 1N-80N/m with the adhesion force of the mass flow body. According to the lithium ion secondary battery manufactured by the method, in the charge and discharge process, the silicon-containing negative electrode material is in volume expansion caused by the embedding and the releasing of lithium ions, the porous composite layer can play a role in buffering the volume, and meanwhile, the silicon-containing negative electrode material layer is firmly bonded to the current collector, so that the silicon-containing negative electrode material is prevented from falling off from the current collector, and the cycle performance of the high-capacity lithium ion secondary battery is improved.
Therefore, the lithium ion secondary battery containing the silicon-containing negative plate has higher energy density and better cycle performance, and meets the industrial application. The utility model discloses a silicon-containing negative plate and contain its lithium ion secondary battery have solved the power of falling problem of the bonding of silicon-containing negative material and mass flow body and silicon-containing negative material, effectively reduce the volume expansion of silicon granule simultaneously, promote the volume energy density of battery greatly.
Drawings
Fig. 1 is a schematic structural view of a silicon-containing negative electrode sheet according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a silicon-containing negative electrode sheet according to another embodiment of the present invention.
Description of reference numerals:
1. current collector
2. First adhesive polymer/inorganic conductive material porous composite layer
3. A first silicon-containing anode material layer
4. Second adhesive polymer/inorganic conductive material porous composite layer
5. A second silicon-containing anode material layer
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with a general description of the invention given above, and the detailed description of the embodiments given below, serve to explain the invention. Further, it is to be understood that the disclosed embodiments are merely exemplary of the disclosure that may be embodied in various forms and that various modifications may be made to the disclosed embodiments herein, which are not to be construed as limiting the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding prior art or the following examples. Other modifications will occur to those skilled in the art which are within the scope and spirit of this invention.
It is also understood that, although the present invention has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of the invention, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
Unless expressly stated otherwise, a numerical range throughout this specification includes any sub-range therein and any numerical value incremented by the smallest sub-unit within a given value. Unless expressly stated otherwise, numerical values throughout this specification represent approximate measures or limitations to the extent that such deviations from the given values, as well as embodiments having approximately the stated values and having the exact values stated, are included. Other than in the operating examples provided at the end of the detailed description, all numbers expressing quantities or conditions of parameters (e.g., quantities or conditions) used in the specification (including the appended claims) are to be understood as being modified in all instances by the term "about" whether or not "about" actually appears before the number. "about" means that the numerical value so stated is allowed to be somewhat imprecise (with some approach to exactness in that value; about or reasonably close to that value; approximately). As used herein, "about" refers to at least variations that can be produced by ordinary methods of measuring and using such parameters, provided that the imprecision provided by "about" is not otherwise understood in the art with this ordinary meaning. For example, "about" can include less than or equal to 10%, less than or equal to 5%, less than or equal to 4%, less than or equal to 3%, less than or equal to 2%, less than or equal to 1%, or less than or equal to 0.1% variation, and in some aspects, less than or equal to 0.01% variation.
Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the invention in unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure.
In one embodiment of the present invention, there is provided a silicon-containing negative electrode sheet as shown in fig. 1, which includes a current collector 1, a first adhesive polymer/inorganic conductive material porous composite layer 2 disposed on one surface of the current collector 1, and a silicon-containing negative electrode material layer 3 disposed on the first adhesive polymer/inorganic conductive material porous composite layer 2.
In another embodiment of the present invention, there is provided a silicon-containing negative electrode sheet as shown in fig. 2, which includes a current collector 1, first and second adhesive polymer/inorganic conductive material porous composite layers 2 and 4 disposed on both faces of the current collector 1, respectively, and silicon-containing negative electrode material layers 3 and 5 disposed on the first and second adhesive polymer/inorganic conductive material porous composite layers 2 and 4, respectively.
The current collector 1 may be made of a metal foil with electronic conductivity, a foil modified by a metal with electronic conductivity, or a modified composite foil with electronic conductivity, and includes a copper foil and an electronic conductive foil coated and/or deposited with copper and carbon, wherein the copper foil or the carbon-coated copper foil is preferred. The thickness of the current collector 1 may be a conventional thickness of a current collector conventionally used for a negative electrode tab of a lithium ion secondary battery without particular limitation, and for example, may be 2 to 25 μm, preferably 3 to 20 μm, such as 2 μm, 3 μm, 4 μm, 5.5 μm, 6 μm, 7.5 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, and the like.
The porous composite layer of the adhesive polymer/inorganic conductive material is arranged on the current collector 1, so that the adhesive force between the silicon-containing negative electrode material layer and the current collector can be improved, and meanwhile, when the silicon-containing negative electrode plate is applied to a lithium ion secondary battery, the capacity of the lithium ion secondary battery can be improved.
The first and second adhesive polymer/inorganic conductive material porous composite layers 2 and 4 are coating layers known in the art and may be formed according to methods known in the art. Specifically, the adhesive polymer/inorganic conductive material porous composite layer is a coating layer formed by mixing an inorganic conductive material and an adhesive polymer (i.e., an adhesive polymer material) and then coating the mixture. The ratio of the inorganic conductive material and the adhesive polymer in the adhesive polymer/inorganic conductive material porous composite layer is not particularly limited and may be selected as needed by those skilled in the art.
The first and second adhesive polymer/inorganic conductive material porous composite layers 2 and 4 may independently have a thickness of 0.02 to 12 μm. The thicknesses of the first and second adhesive polymer/inorganic conductive material porous composite layers 2 and 4 may be arbitrarily selected from the above ranges, and are, for example, 0.025 μm, 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 2.8 μm, 3 μm, 3.5 μm, 4 μm, 4.2 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, or the like, independently of each other. Further, the thicknesses of the first adhesive polymer/inorganic conductive material porous composite layer 2 and the second adhesive polymer/inorganic conductive material porous composite layer 4 may be the same or different. For example, the first adhesive polymer/inorganic conductive material porous composite layer 2 and the second adhesive polymer/inorganic conductive material porous composite layer 4 may each have a thickness of 3 μm, or the first adhesive polymer/inorganic conductive material porous composite layer 2 may have a thickness of 5 μm, and the second adhesive polymer/inorganic conductive material porous composite layer 4 may have a thickness of 3 μm.
The adhesive polymer may be selected from polymer materials having adhesive properties by those skilled in the art, and may be selected from, for example, cellulose acetate propionate, cellulose acetate, polyvinyl alcohol, polyvinylidene fluoride, polycarbonate, polypropylene, polymethyl methacrylate, carboxymethyl cellulose, polyamide, polyimide-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polyacrylonitrile, polyvinyl, pyrrolidone, sodium alginate, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate butyrate, polyvinyl chloride, butadiene-co-acrylonitrile, tetrafluoroethylene-co-hexafluoropropylene-co-vinylidene fluoride, ethylene-co-acrylic acid, polyethylene glycol, one or more of styrene-butadiene rubber and polyacrylonitrile.
The inorganic conductive material may be selected from a metal material or a carbon material having electron conductivity by those skilled in the art. The carbon material includes carbon materials having conductivity such as nanocarbon, carbon black, graphite, graphene, and carbon nanotube. The metal material comprises metals such as gold, silver, copper, nickel, tungsten and the like. The average particle size of the inorganic conductive material is not particularly limited, and may be a conventional average particle size of the inorganic conductive material of the negative electrode sheet of the lithium ion secondary battery, and may be, for example, 0.01 to 10 μm, such as 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, or the like.
The adhesive polymer and the inorganic conductive material used in the first adhesive polymer/inorganic conductive material porous composite layer 2 and the second adhesive polymer/inorganic conductive material porous composite layer 4 may be independently the same or different. For example, the first adhesive polymer/inorganic conductive material porous composite layer 2 and the second adhesive polymer/inorganic conductive material porous composite layer 4 may use the same adhesive polymer and inorganic conductive material, or the first adhesive polymer/inorganic conductive material porous composite layer adopts different adhesive polymer from the second adhesive polymer/inorganic conductive material porous composite layer 4, but using the same inorganic conductive material as the second adhesive polymer/inorganic conductive material porous composite layer 4, or the adhesive polymer and the inorganic conductive material adopted by the first adhesive polymer/inorganic conductive material porous composite layer 2 are different from the adhesive polymer and the inorganic conductive material adopted by the second adhesive polymer/inorganic conductive material porous composite layer 4 respectively.
The first and second silicon-containing anode material layers 3 and 5 are coatings known in the art and may be formed according to methods known in the art. Specifically, the silicon-containing negative electrode material layer is a coating layer formed by mixing and coating a silicon-containing negative electrode material, a conductive agent, a thickener, a binder, and optionally a carbon material capable of receiving and outputting lithium ions, a lithium simple substance, a lithium-containing compound, or the like. The ratio of the silicon-containing negative electrode material, the conductive agent, the thickener, the binder, and optionally, a carbon material that can accept and output lithium ions, a lithium simple substance, or a lithium-containing compound in the silicon-containing negative electrode material layer is not particularly limited and may be selected by those skilled in the art as needed.
The first and second silicon-containing anode material layers 3 and 5 may independently have a thickness of 0.02 to 150 μm. Wherein the thicknesses of the first and second silicon-containing anode material layers 3 and 5 may be arbitrarily selected from the above ranges, for example, each independently 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 145 μm, and the like. In addition, the thicknesses of the first silicon-containing anode material layer 3 and the second silicon-containing anode material layer 5 may be the same or different. For example, the first silicon-containing anode material layer 3 and the second silicon-containing anode material layer 5 may each have a thickness of 50 μm, or the first silicon-containing anode material layer 3 may have a thickness of 30 μm, and the second silicon-containing anode material layer 5 may have a thickness of 80 μm.
In an embodiment, a thickness ratio of the first porous composite layer 2 of the adhesive polymer/inorganic conductive material to the first silicon-containing anode material layer 3 and a thickness ratio of the second porous composite layer 4 of the adhesive polymer/inorganic conductive material to the second silicon-containing anode material layer 5 both satisfy the following relationship: and a/b is not less than 3 and not more than 500, preferably not less than 5 and not more than a/b and not more than 300, wherein a represents the thickness of the first or second silicon-containing anode material layer, and b represents the thickness of the first or second adhesive polymer/inorganic conductive material porous composite layer. The a/b can be 6, 7, 8, 9, 10, 15, 20, 30, 50, 80, 100, 120, 140, 150, 180, 200, 220, 250, 280, 300, 350, 400, 450, etc. If a/b is less than 3, the occupation ratio of the porous composite layer of the adhesive polymer/inorganic conductive material is too high, and the occupation ratio of the silicon-containing negative electrode material layer is too low, so that the energy density of the manufactured lithium ion secondary battery is lower; if a/b is more than 500, the ratio of the adhesive polymer/inorganic conductive material porous composite layer is too low, the ratio of the silicon-containing negative electrode material layer is too high, the reinforced adhesive effect of the adhesive polymer/inorganic conductive material porous composite layer is weakened, and the expansion of the silicon-containing negative electrode material cannot be well inhibited, so that the cycle performance is influenced. In addition, the thickness ratio of the first porous composite layer 2 of adhesive polymer/inorganic conductive material to the first silicon-containing anode material layer 3 and the thickness ratio of the second porous composite layer 4 of adhesive polymer/inorganic conductive material to the second silicon-containing anode material layer 5 may be the same or different. For example, the thickness ratio of the first porous composite layer 2 of adhesive polymer/inorganic conductive material to the first silicon-containing anode material layer 3 and the thickness ratio of the second porous composite layer 4 of adhesive polymer/inorganic conductive material to the second silicon-containing anode material layer 5 may both be 6, or the thickness ratio of the first porous composite layer 2 of adhesive polymer/inorganic conductive material to the first silicon-containing anode material layer 3 may be 10, and the thickness ratio of the second porous composite layer 4 of adhesive polymer/inorganic conductive material to the second silicon-containing anode material layer 5 may be 6.
The silicon-containing anode material is not particularly limited and may be any silicon-based anode material available in the art. The silicon-containing anode material can be a commercial product, and can also be prepared according to the disclosed method or a variant thereof. In particular, the silicon-containing anode material may be any silicon-based composite material used in the art as an anode material, such as a silicon-carbon composite material (including nano silicon-carbon materials), a silicon-oxygen composite material (including a silica composite material). The silicon-based composite material may be a commercially available product, for example, a nano silicon carbon material produced by tianmu lead battery materials science and technology ltd, a silicon-oxygen composite material produced by shin-Etsu chemical industry co. The silicon-based composite material can also be a silicon-based negative electrode material prepared according to the method disclosed in the literature and the variants thereof.
The silicon-containing negative electrode material may be present in the form of regular or irregular particles, and the average particle diameter D50 of the particles may be 0.01 to 30 μm, preferably 0.05 to 25 μm, for example, 0.03 μm, 0.1 μm, 1 μm, 2 μm, 2.5 μm, 3 μm, 4 μm, 5 μm, 8 μm, 10 μm, 13 μm, 15 μm, 18 μm, 20 μm, 25 μm, 30 μm.
The conductive agent may be a conventional conductive agent used in the art for the silicon-containing negative electrode sheet, for example, the conductive agent is a mixture of one or more selected from conductive carbon black, acetylene black, ketjen black, nano carbon, conductive graphite, carbon nanotubes, and graphene.
The thickener may be a conventional thickener used in the art for silicon-containing negative electrode sheets, for example, a polymer having a thickening effect selected from, for example, sodium carboxymethyl cellulose, polyvinyl alcohol, or the like.
The binder may be a binder conventionally used in the art for a silicon-containing negative electrode sheet, for example, a polymer having adhesion selected from styrene-butadiene rubber (SBR), vinylidene fluoride homopolymers and copolymers (such as PVDF, etc.), tetrafluoroethylene homopolymers and copolymers (such as PTFE), acrylic copolymers and homopolymers (such as PAA, etc.), sodium alginate-based polymers (such as SAA, etc.), and the like.
The components of the silicon-containing anode material, the conductive agent, the thickener, the binder, and the like used in the first and second silicon-containing anode material layers 3 and 5 may be independently the same or different. For example, the first silicon-containing anode material layer 3 and the second silicon-containing anode material layer 5 may use the same components of silicon-containing anode material, conductive agent, thickener, binder, etc., or the first silicon-containing anode material layer 3 may use a silicon-containing anode material, etc., different from the second silicon-containing anode material layer 5, but use the same conductive agent, etc., as the second silicon-containing anode material layer 5, or the first silicon-containing anode material layer 3 may use components of silicon-containing anode material, conductive agent, thickener, binder, etc., different from the second silicon-containing anode material layer 5.
In addition, the utility model discloses still relate to a lithium ion secondary battery, it contains aforementioned siliceous negative pole piece.
The lithium ion secondary battery may have a structure and components, such as a positive electrode sheet, a separator, an electrolyte, and a battery case, which are conventional in the art and are included in lithium ion secondary batteries, in addition to the above-described silicon-containing negative electrode sheet.
The utility model discloses a set up porous composite bed on the mass flow body, can improve the adhesion force of silicon-containing negative material layer and mass flow body. The addition of the porous composite layer can improve the adhesion between the silicon-containing negative electrode material layer and the current collector by 0.5 to 100N/m, preferably 1 to 80N/m, as compared with the case where the porous composite layer is not included. Meanwhile, when the silicon-containing negative plate is applied to the lithium ion secondary battery, the cycle capacity of the lithium ion secondary battery can be improved.
The present invention has been described in detail hereinabove, but the above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention can be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.
Claims (9)
1. A silicon-containing negative electrode sheet, comprising:
1) a current collector;
2) a first adhesive polymer/inorganic conductive material porous composite layer provided on one surface of the current collector; and
3) a first silicon-containing negative electrode material layer disposed on the first adhesive polymer/inorganic conductive material porous composite layer.
2. The silicon-containing negative electrode sheet according to claim 1, wherein the thickness of the first porous composite layer of the adhesive polymer/inorganic conductive material is 0.02 to 12 μm, and the thickness of the first layer of the silicon-containing negative electrode material is 0.02 to 150 μm.
3. The silicon-containing negative electrode sheet according to claim 1 or 2, wherein the thickness ratio of the first adhesive polymer/inorganic conductive material porous composite layer to the first silicon-containing negative electrode material layer satisfies the following relationship: and a/b is less than or equal to 3 and less than or equal to 500, wherein a represents the thickness of the first silicon-containing negative electrode material layer, and b represents the thickness of the first adhesive polymer/inorganic conductive material porous composite layer.
4. The silicon-containing negative electrode sheet according to claim 1, further comprising a second porous composite layer of adhesive polymer/inorganic conductive material disposed on the other side of the current collector, and a second layer of silicon-containing negative electrode material disposed on the second porous composite layer of adhesive polymer/inorganic conductive material.
5. The silicon-containing negative electrode sheet according to claim 4, wherein the first and second adhesive polymer/inorganic conductive material porous composite layers independently have a thickness of 0.02 to 12 μm, and the first and second silicon-containing negative electrode material layers independently have a thickness of 0.02 to 150 μm.
6. The silicon-containing negative electrode sheet according to claim 4 or 5, wherein a thickness ratio of the first porous composite adhesive polymer/inorganic conductive material layer to the first silicon-containing negative electrode material layer and a thickness ratio of the second porous composite adhesive polymer/inorganic conductive material layer to the second silicon-containing negative electrode material layer satisfy the following relationship: and a/b is less than or equal to 3 and less than or equal to 500, wherein a represents the thickness of the first or second silicon-containing anode material layer, and b represents the thickness of the first or second adhesive polymer/inorganic conductive material porous composite layer.
7. The silicon-containing negative electrode sheet according to claim 1, wherein the material of the current collector is selected from a copper foil and an electronically conductive foil coated and/or deposited with copper or carbon.
8. The silicon-containing negative electrode sheet according to claim 1, wherein the thickness of the current collector is 2 to 25 μm.
9. A lithium ion secondary battery comprising the silicon-containing negative electrode sheet according to any one of claims 1 to 8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111710832A (en) * | 2020-07-13 | 2020-09-25 | 江苏卓高新材料科技有限公司 | Silicon-containing negative plate, preparation method thereof and lithium ion secondary battery manufactured by silicon-containing negative plate |
| CN114361461A (en) * | 2022-01-10 | 2022-04-15 | 上海恩捷新材料科技有限公司 | Flexible current collector core layer, current collector, pole piece, battery and preparation method of flexible current collector core layer, current collector, pole piece and battery |
-
2020
- 2020-07-13 CN CN202021365020.6U patent/CN212303706U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111710832A (en) * | 2020-07-13 | 2020-09-25 | 江苏卓高新材料科技有限公司 | Silicon-containing negative plate, preparation method thereof and lithium ion secondary battery manufactured by silicon-containing negative plate |
| CN114361461A (en) * | 2022-01-10 | 2022-04-15 | 上海恩捷新材料科技有限公司 | Flexible current collector core layer, current collector, pole piece, battery and preparation method of flexible current collector core layer, current collector, pole piece and battery |
| CN114361461B (en) * | 2022-01-10 | 2024-01-16 | 上海恩捷新材料科技有限公司 | Flexible current collector core layer, current collector, pole piece, battery and preparation method of battery |
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