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

A solid-state battery, positive electrode technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve problems such as poor rate performance, poor mechanical strength, and increased battery internal resistance

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 use of a solid electrolyte leads to an increase in the thickness of the pole piece, thereby increasing the migration path of lithium ions, resulting in an increase in the internal resistance of the battery, which in turn reduces the cycle performance and rate performance of the battery.
[0006] The above scheme has the problem of poor rate performance or poor mechanical strength. Therefore, it is urgent to develop a positive electrode sheet for solid-state batteries with good rate performance and high mechanical strength.

Method used

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

Examples

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Effect test

Embodiment 1

[0055] 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:

[0056] (1) Take NCM811@Li 2 ZrO 3 The mass ratio of :LSPS:SP:PVDF21216 is 75:7:9:9 for later use, and then THF is used to dissolve PVDF21216. The solid content of the glue is 6%. After stirring and homogenizing the glue with other components, the solid content is obtained. The first slurry is 73%, and the first slurry is coated on a carbon-coated aluminum foil and dried at 80° C. and hot-rolled to obtain a first active layer with a thickness of 20 μm;

[0057] (2) Take NCM811@Li 2 ZrO 3 :LSPCl:(SP:VGCF):SBS mass ratio is 60%: 35%: 2% (SP:CNT=3:7): 3% for later use, then use anisole to dissolve SBS, the solid content of the glue is 7% After stirring, mixing and homogenizing the glue solution with the materials of oth...

Embodiment 2

[0060] 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:

[0061] (1) Take NCM811@Li 2 NbO 3 :LSPCl:(SP:CNT):PVDF-LBG mass ratio is 85:5:5(SP:CNT=9:1):5 for later use, then use cyclohexanone to dissolve PVDF-LBG, the solid content of the glue is 4.5% , after mixing and homogenizing the glue solution with the materials of other components, the first slurry with a solid content of 75% is obtained, and the first slurry is 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 25 μm;

[0062] (2) Take NCM811@Li 2 NbO 3 :LGPS:(SP:VGCF):SEBS mass ratio is 50%: 45%: 2% (SP:CNT=4:6): 3% for standby, then use anisole to dissolve SEBS, the solid content of the glue is 6.5% After stirring, mixing and homog...

Embodiment 3

[0065] 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:

[0066] (1) Take NCM811@LiPO3: LSPS: (SP: VGCF): PVDF-HVS900 with a mass ratio of 89:4:4 (SP: VGCF=9:1):3 for later use, and then use cyclohexanone to dissolve PVDF-HVS900, The solid content of the glue solution is 5%. After the glue solution is stirred, mixed and homogenized with the materials of other components, the first slurry with a solid content of 71% is obtained, and the first slurry is coated on a carbon-coated aluminum foil at 80°C After drying and hot rolling, the thickness of the first active layer is 10 μm;

[0067] (2) Take NCM811@Li 2 NbO 3 :LSPCl:(AB:VGCF:graphene): PVDF-LBG mass ratio is 68%: 29%: 2% (AB:VGCF:graphene=3:5:2): 1% for standby, then use tetrahydrofuran to dissolve PVDF -LBG, the solid c...

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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 current collector with first slurry, drying, and then rolling to form a first active layer on the current collector to obtain a first precursor; and (2) coating the first active layer of the first precursor with a second slurry, drying, rolling to obtain a second active layer, and carrying out warm isostatic pressing treatment 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. According to the preparation method, the rate capability and the mechanical strength of the positive plate for the solid-state battery can be improved, 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] 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. Sulfide electrolytes mainly include thio-LISICON, Li 10 GeP 2 S 12 , Li 6 P.S. 5 Cl, Li 10 SnP 2 S 12 , Li 2 S-P 2 S 5 , Li 2 S-SiS 2 , Li 2 S-B 2 S 3 etc., the ionic conductivity at room temperature can reach 10 -3 ~10 -2 S / cm, which is close to or even exceeds the organic electrolyte, and has the characteristics of high thermal stability, good safety performance, and wide electrochemical stability window (up to 5V or more). It has outstanding advantages in high power and high and low te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/04H01M4/131H01M10/0525
CPCH01M4/1391H01M4/0404H01M4/0435H01M4/131H01M10/0525Y02E60/10
Inventor 王磊黄海强李瑞杰陈少杰周龙捷
Owner SVOLT ENERGY TECH (WUXI) CO LTD
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