A positive electrode sheet for a solid-state battery and its preparation method and application

A solid-state battery and positive electrode technology, which is applied in battery electrodes, electrode manufacturing, electrode rolling/calendering, etc., can solve the problems of reduced rate performance of the electrode sheet, high porosity of the sulfide solid-state battery, and low peel strength of the electrode sheet. Achieve high rate performance and mechanical strength

Active Publication Date: 2022-04-15
SVOLT ENERGY TECH (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the porosity of the sulfide solid-state battery is high, which in turn leads to a decrease in the rate performance of the pole piece
[0006] The above scheme has the problem of low peel strength or low electrical conductivity of the pole sheet. Therefore, it is necessary to develop a positive electrode sheet for solid-state batteries with high peel force and good rate performance.

Method used

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  • A positive electrode sheet for a solid-state battery and its preparation method and application

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Embodiment 1

[0059] This embodiment provides a positive electrode sheet for a solid-state battery, the preparation process flow chart of the positive electrode sheet for a solid-state battery is as follows figure 1 As shown, the specific preparation method is as follows:

[0060] (1) Take NCM811@LiNbO 3 : Li 2 S-P 2 S 5 :SP:PVDF21216 mass ratio is 70:10:10:10 for standby, then use tetrahydrofuran to dissolve PVDF21216, the solid content of the glue is 6%, after mixing and homogenizing the glue with other components, the solid content is 75% % of the first slurry, after coating the first slurry on the carbon-coated aluminum foil at 80°C, drying and hot rolling, the thickness of the first active layer is 19 μm;

[0061] (2) Take NCM811@LiNbO 3 : Li 2 S-P 2 S 5 :(SP:CNT):PVDF21216 mass ratio is 55:40:2(SP:CNT=3:7):3 for later use, then use tetrahydrofuran to dissolve PVDF21216, the solid content of the glue is 6%, mix the glue with other components After the materials were stirred an...

Embodiment 2

[0064] This embodiment provides a positive electrode sheet for a solid-state battery, and the preparation method of the positive electrode sheet for a solid-state battery is as follows:

[0065] (1) Take NCM811@LiTiO 3 : LSPCl: (SP: CNT): PVDF-HFP mass ratio is 85: 5: 5 (SP: CNT = 9: 1): 5 for later use, then use dichloromethane to dissolve PVDF-HFP, the solid content of the glue is 5.5% , after mixing and homogenizing the glue solution with the materials of other components, the first slurry with a solid content of 78% was obtained, and the first slurry was coated on a carbon-coated aluminum foil at 80°C and dried by hot rolling, The thickness of the first active layer is obtained to be 15 μm;

[0066] (2) Take NCM811@LiNbO 3 : LSPCl: (AB: VGCF): PVDF21216 mass ratio is 45: 50: 2 (AB: VGCF = 3: 7): 3 for standby, then use tetrahydrofuran to dissolve PVDF21216, the solid content of the glue is 6%, mix the glue with other After the materials of the components were stirred, m...

Embodiment 3

[0069] This embodiment provides a positive electrode sheet for a solid-state battery, and the preparation method of the positive electrode sheet for a solid-state battery is as follows:

[0070] (1) Take NCM811@LiZrO 3 : LGPS: (SP: VGCF): SBS mass ratio is 90: 3: 4 (SP: VGCF = 8: 2): 3 for later use, then use xylene to dissolve SBS, the solid content of the glue is 6.5%, mix the glue with After the materials of other components were stirred, mixed and homogenized, the first slurry with a solid content of 77% was obtained, and the first slurry was coated on a charcoal-coated aluminum foil and dried at 80°C by hot rolling to obtain the first active layer The thickness is 10μm;

[0071] (2) Take NCM811@LiNbO 3 : LSPCl: (AB: VGCF: graphene): PVDF-LBG mass ratio is 66: 31: 2 (AB: VGCF: graphene = 3: 5: 2): 1 for standby, then use tetrahydrofuran to dissolve PVDF-LBG, glue The liquid-solid content is 6%. After the glue is stirred and mixed with other components and homogenized, a...

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Abstract

The invention provides a positive electrode sheet for a solid-state battery and its preparation method and application. The preparation method includes the following steps: (1) coating the first slurry on the first current collector, rolling it after drying, and then Forming a first active layer on a current collector to obtain a first precursor; (2) coating the second slurry on a second current collector, rolling after drying, and forming a second active layer on the second current collector, Obtain the second precursor; (3) paste the first active layer of the first precursor obtained in step (1) and the second active layer of the second precursor, remove the second current collector after warm isostatic pressing transfer, The positive electrode sheet for the solid-state battery is obtained; both the first active layer and the second active layer contain an inorganic solid electrolyte. The positive electrode sheet for solid-state batteries prepared by the preparation method has high rate performance and mechanical strength, effectively controls the layered distribution of binders and conductive agents, and is conducive to promoting the commercial application of all-solid-state batteries.

Description

technical field [0001] The invention belongs to the field of solid-state batteries, and relates to a positive electrode sheet for a solid-state battery and a preparation method and application thereof. Background technique [0002] The solid-state battery replaces the flammable organic liquid electrolyte with a non-flammable solid electrolyte, which greatly improves the safety of the battery system and achieves a simultaneous increase in energy density. Among all kinds of new battery systems, solid-state batteries are the next-generation technology closest to industrialization, which has become the consensus of the industry and the scientific community. Among them, the sulfide electrolyte has relatively high lithium ion conductivity. [0003] However, when using a sulfide solid electrolyte to prepare an all-solid-state battery system, since there is no electrolyte infiltration like a liquid battery in the system, the ion migration depends entirely on the solid electrolyte, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/04H01M4/131H01M10/052
CPCH01M4/1391H01M4/0404H01M4/0435H01M4/131H01M10/052Y02E60/10
Inventor 王磊李瑞杰黄海强陈少杰周龙捷
Owner SVOLT ENERGY TECH (WUXI) CO LTD
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