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Composite positive electrode slurry, positive electrode plate and solid-state battery

A technology of composite positive electrode and positive electrode sheet, which is applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor electrochemical performance of batteries and large impedance of solid-state batteries, so as to improve ionic conductivity and reduce interface impedance. , the effect of avoiding the formation of harmful substances

Inactive Publication Date: 2021-01-29
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application discloses a composite positive electrode slurry, positive electrode sheet, and solid-state battery, which are used to solve the problems of high impedance and poor electrochemical performance of the existing solid-state battery

Method used

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preparation example Construction

[0024] In the first aspect, the present application proposes a composite positive electrode slurry, and the preparation method of the composite positive electrode slurry comprises the following steps:

[0025] Mix the positive electrode active material with lithium carbon boron oxide and sinter at 660-700°C to obtain a prefabricated sintered material;

[0026] The obtained prefabricated sintered material, solid electrolyte, conductive agent, adhesive and lithium salt are dissolved in a solvent and mixed to obtain the composite cathode slurry.

[0027] In the preparation process of the composite positive electrode slurry provided by this application, the positive electrode active material is mixed with lithium carbon boron oxide and sintered at 660-700°C. During the sintering process, the sintering temperature can make lithium carbon boron form a molten state, It is made to wrap the surface of the positive electrode active material particles, and at the same time, the sintering...

Embodiment 1

[0048] Preparation of positive electrode sheet:

[0049] Step S11) Weigh lithium cobalt oxide, lithium carbon boron oxide and LAGP respectively according to the mass ratio of 55:10:35, first mix lithium cobalt oxide and lithium carbon boron oxide evenly, and then calcinate at 660°C for 1 hour to obtain the expected sintered material ;

[0050] Step S12) The obtained prefabricated sintered material is fully ball-milled with LAGP to obtain a prefabricated mixture;

[0051] Step S13) Mix the prefabricated mixture, conductive agent, and adhesive in NMP at a mass ratio of 8:1.5:0.5, and then add lithium salt to obtain a composite positive electrode slurry; wherein, the mass ratio of lithium salt to adhesive is 1:5 ;

[0052] Step S14) Coating the obtained composite positive electrode slurry on the positive electrode current collector, and drying by blowing air to obtain the positive electrode sheet, wherein the baking temperature is 95°C.

Embodiment 2

[0054] Preparation of positive electrode sheet:

[0055] Step S11) Weigh lithium cobalt oxide, lithium carbon boron oxide and LAGP respectively according to the mass ratio of 58:12:30, first mix lithium cobalt oxide and lithium carbon boron oxide evenly, and then calcinate at 660°C for 1 hour to obtain the expected sintered material ;

[0056] Step S12) The obtained prefabricated sintered material is fully ball-milled with LAGP to obtain a prefabricated mixture;

[0057] Step S13) Mix the prefabricated mixture, conductive agent, and adhesive in NMP at a mass ratio of 8:1.5:0.5, and then add lithium salt to obtain a composite positive electrode slurry; wherein, the mass ratio of lithium salt to adhesive is 1:5 ;

[0058] Step S14) Coating the obtained composite positive electrode slurry on the positive electrode current collector, and drying by blowing air to obtain the positive electrode sheet, wherein the baking temperature is 95°C.

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Abstract

The invention relates to the field of batteries, and discloses composite positive electrode slurry, a positive electrode plate and a solid-state battery. A preparation method of the composite positiveelectrode slurry comprises the following steps: mixing a positive electrode active material with lithium carbon boron oxide, and sintering at 660-700 DEG C to obtain a prefabricated sintering material; and dissolving the obtained prefabricated sintering material, a solid electrolyte, a conductive agent, an adhesive and a lithium salt in a solvent, and mixing to obtain the composite positive electrode slurry. The problems that an existing solid-state battery is large in impedance and poor in electrochemical performance are solved.

Description

technical field [0001] The present application relates to the field of batteries, in particular to a composite positive electrode slurry, positive electrode sheet, and solid state battery for solid secondary batteries. Background technique [0002] In recent years, safety accidents caused by organic electrolytes with low boiling point, low flash point, and flammability and volatility have increased with the increase in the application scale of lithium batteries, which has greatly restricted the development of high specific energy lithium secondary batteries. . All-solid-state batteries that use solid-state electrolytes instead of traditional organic liquid electrolytes are expected to fundamentally solve the problem of battery safety and are ideal chemical power sources for electric vehicles and large-scale energy storage devices. For the development of all-solid-state batteries, in order to build a stable interface, improve ionic conductivity, and reduce interface impedanc...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/131H01M4/136H01M10/052
CPCH01M4/131H01M4/136H01M4/362H01M4/62H01M10/052Y02E60/10
Inventor 周兰廖文俊耿振李斯剑
Owner SHANGHAI ELECTRICGROUP CORP
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