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Silicon-containing negative electrode sheet and preparation method thereof and lithium ion secondary battery prepared from silicon-containing negative electrode sheet

A silicon negative electrode and silicon content technology, which is applied in the direction of secondary battery, negative electrode, electrode manufacturing, etc., can solve the problem of battery volume energy density limitation and other issues

Inactive Publication Date: 2020-09-25
JIANGSU ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the capacity of graphite is far lower than that of silicon, and the volume expansion of graphite pole pieces also has about 10% in the process of charging and discharging, the volumetric energy density of batteries made with this negative pole piece is limited by graphite materials.

Method used

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  • Silicon-containing negative electrode sheet and preparation method thereof and lithium ion secondary battery prepared from silicon-containing negative electrode sheet
  • Silicon-containing negative electrode sheet and preparation method thereof and lithium ion secondary battery prepared from silicon-containing negative electrode sheet
  • Silicon-containing negative electrode sheet and preparation method thereof and lithium ion secondary battery prepared from silicon-containing negative electrode sheet

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Experimental program
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Embodiment

[0063] The specific manner of the present invention is described below with reference to specific embodiments, so as to make the technical content of the present invention clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned herein.

[0064] Reagents and Instruments

[0065] Materials, reagents, equipment, etc. used in the examples can be obtained from commercial sources unless otherwise specified. Unless stated otherwise, like terms refer to like materials.

[0066] The thickness test adopts the Japanese Mitutoyo Mitutoyo digital outer micrometer 193-111.

[0067] Stirring adopts the vacuum dual planetary mixer) HG-XJ-30A of Ross (Wuxi) Equipment Co., Ltd.

[0068] The test of battery capacity and capacity, and the test of cycle performance adopt the battery test point Bk-3512 of Guangzhou Lanqi Electronics Industry Co., L...

preparation example 1

[0070] Preparation Example 1: Production of Positive Electrode Sheet:

[0071] Dissolve the positive electrode material, conductive agent, and binder in N-methylpyrrolidone at a ratio of 97:1.5:1.5 and stir to make a slurry, and evenly coat it on the aluminum foil of the positive electrode current collector, dry it, and cut it after rolling , spot welding to make the positive plate of lithium-ion battery. The positive electrode material adopted in the embodiment is nickel manganese cobalt ternary (LiNi 1-x-y CoMnO 2 ) ternary material 811, the thickness after coating and rolling is 200 μm.

Embodiment 1

[0072] Embodiment 1: the making of silicon-containing negative electrode sheet

[0073] Preparation of Porous Composite Layer Slurry

[0074] Carbon black (average particle size is 0.3 μ m) as the conductive agent and the mixture of polyvinylidene fluoride PVDF and polymethyl acrylate as the mass ratio of the polymer material are 50:50 according to the conductive agent: polymer mixture dry powder mass ratio Disperse in water at a ratio of 30:70 to make a water-soluble suspension slurry of carbon black and polymer, with a solid content of 30wt%.

[0075] Preparation of silicon-containing negative electrode material slurry

[0076] The silicon-carbon composite material (purchased from Tianmu Pioneer Battery Material Technology Co., Ltd., with a capacity of 3000mAh / g and an average particle size of D50 of 0.1 μm) and artificial graphite (purchased from Beiterui New Material Group Co., Ltd. S360-L2, D50 =15 μm) was mixed according to 80:20 as silicon-containing negative elec...

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Abstract

The invention relates to a silicon-containing negative electrode sheet and a preparation method thereof, and a lithium ion secondary battery prepared from the silicon-containing negative electrode sheet. The silicon-containing negative electrode sheet comprises: 1) a current collector; 2) a porous composite layer located on the current collector; and 3) a silicon-containing negative electrode material layer located on the porous composite layer, wherein the porous composite layer can be arranged on one side or two sides of the current collector, and the silicon-containing negative electrode material layer is arranged on the porous composite layer. According to the invention, the adhesive force between the silicon-containing negative electrode material and the current collector in the silicon-containing negative electrode sheet is improved, so that the lithium ion secondary battery prepared from the silicon-containing negative electrode sheet has relatively high energy density and relatively good cycle performance, and well meets industrial application.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and in particular relates to a silicon-containing negative pole piece, a preparation method thereof and a lithium-ion secondary battery containing the pole piece. Background technique [0002] Negative electrode materials (also called negative electrode active materials or negative electrode active materials) are one of the important components of lithium-ion batteries, which directly affect key indicators such as energy density, cycle life, and safety performance of batteries. Compared with graphite anodes, silicon-containing anode materials have obvious advantages in energy density. The theoretical specific capacity of graphite is 372mAh / g, while the theoretical specific capacity of silicon anode material is more than 10 times that, up to 4200mAh / g, which can greatly increase the capacity of a single battery cell and increase the cruising range of electric vehicles. [0003] Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/66H01M4/04H01M10/0525
CPCH01M4/134H01M4/1395H01M4/667H01M4/0404H01M10/0525H01M2004/027Y02E60/10
Inventor 朱继涛王晓明刘勇标黄士斌徐强
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD
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