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Positive plate for solid-state battery, and preparation method and application thereof

A technology for solid-state batteries and positive electrodes, which is applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., and can solve problems such as high porosity of sulfide solid-state batteries, reduced rate performance of electrode sheets, and low conductivity

Active Publication Date: 2021-05-11
SVOLT ENERGY TECH (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Positive plate for solid-state battery, and preparation method and application thereof

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Effect test

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 plate for a solid-state battery, and a preparation method and application thereof. The preparation method comprises the following steps: (1) coating a first current collector with a first slurry, drying and then rolling, and forming a first active layer on the first current collector to obtain a first precursor; (2) coating a second current collector with a second slurry, drying and rolling to form a second active layer on the second current collector to obtain a second precursor; and (3) oppositely adhering the first active layer of the first precursor and the second active layer of the second precursor obtained instep (1), and removing the second current collector after temperature isostatic pressing transfer to obtain the positive plate for the solid-state battery, The first active layer and the second active layer both contain an inorganic solid electrolyte. The positive plate for the solid-state battery prepared by the preparation method has relatively high rate capability and mechanical strength, layered distribution of the binder and the conductive agent is effectively controlled, and commercialized application of the all-solid-state battery is promoted.

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 Applications(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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