An electrode sheet, its preparation method, and a solid-state battery with the electrode sheet

A technology of electrode sheet and conductive agent, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as easy to break, cannot change the diaphragm, and has no protective effect, so as to reduce the probability of spontaneous combustion and improve safety. Effect

Active Publication Date: 2022-04-05
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most common way to improve safety is to use ceramic diaphragms. Ceramic diaphragms can improve the thermal shrinkage performance of the diaphragm to a certain extent, but they cannot change the nature of the diaphragm shrinking when heated.
Moreover, when the ambient temperature is higher than 180°C, the ceramic diaphragm has reached the limit of shrinkage, and then it is prone to breakage. Therefore, in this case, the protective effect of the ceramic diaphragm does not exist.

Method used

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  • An electrode sheet, its preparation method, and a solid-state battery with the electrode sheet
  • An electrode sheet, its preparation method, and a solid-state battery with the electrode sheet
  • An electrode sheet, its preparation method, and a solid-state battery with the electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a negative electrode sheet, comprising the following steps:

[0036] Step 1, preparation of coating 1 and 2 slurry:

[0037]Weigh the negative electrode active material natural graphite, the conductivity agent SuperP, and the powder CMC and SBR of the binder. Among them, the mass ratio of natural graphite:SP:CMC:SBR=94:1:1:1, first dissolve CMC with deionized water, Then add natural graphite and SP respectively, and finally add SBR. When these components are completely dispersed, add deionized water to adjust the solid content of the slurry to 40%, and finally perform vacuum degassing for 4 hours to complete the coating-2 slurry preparation of

[0038] Step 2, preparation of coating 2 and 3 slurry:

[0039] a. mix NMP and DMP with mass ratio m(NMP):m(DMF)=1:1, thereby complete the preparation of mixed solvent one;

[0040] b. Stir the mixed solvent 1 at a speed of 500~1000rpm, and add PVDF powder at a constant speed according to the mass ratio ...

Embodiment 2

[0056] A method for preparing a positive electrode sheet, comprising the following steps:

[0057] Step 1, preparation of coating-slurry:

[0058] Weigh the positive electrode active material NCM, conductivity agent KS-15, powder cellulose acetate butyrate and cyanoethyl sucrose as binder, wherein, the mass ratio NCM: KS-15: cellulose acetate butyrate: cyanoethyl sucrose = 48:1:1:1, first dissolve cyanoethyl sucrose with deionized water, then add NCM and KS-15 respectively, and finally add cellulose acetate butyrate, when these components are completely dispersed, add deionized water, Adjust the solid content of the slurry to 50%, and finally perform vacuum degassing for 4 hours, thereby completing the preparation of the coating-slurry;

[0059] Step 2, preparation of coating 2 slurry:

[0060] a. mix DMAc and acetone with mass ratio m(DMAc):m(acetone)=1:1, thus complete the preparation of mixed solvent one;

[0061] b. Stir the mixed solvent 1 at a speed of 500~1000rpm, an...

Embodiment 3

[0067] A method for preparing a negative electrode sheet, comprising the following steps:

[0068] Step 1, preparation of coating-slurry:

[0069] Weigh the negative electrode active material silicon carbon material, conductivity agent Ketjen black, and binder powder PMMA and PVA. Among them, the mass ratio of silicon carbon material: Ketjen black: PMMA:PVA=95:1.5:1.5:1.5, first use Dissolve PVA in deionized water, then add silicon carbon material and Ketjen black respectively, and finally add PMMA, when these components are completely dispersed, add deionized water, adjust the solid content of the slurry to 45%, and finally perform vacuum degassing for 4 hours , thereby completing the preparation of the coating-slurry;

[0070] Step 2, preparation of coating 3 slurry:

[0071] (1) In an environment with a dew point less than -20°C, mix DMAc and THF at a mass ratio of m(tetrahydrofuran):m(DMAc)=1:1 to complete the preparation of mixed solvent II;

[0072] (2) Weigh LiBOB po...

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Abstract

The invention discloses an electrode sheet, which relates to the field of lithium-ion solid-state batteries, and mainly includes a current collector and a coating one coated on both sides of the current collector. The outer side of the coating one is coated with a coating two or a coating One or two of the three, the first coating contains electrode active material, binder and conductive agent, the second coating contains lithium ion conductor material, inert powder and binder, the coating Layer three contains lithium salt and binder. Among them, coating 2 and coating 3 can expand and contract synchronously with coating 1, so the probability of damage is reduced, and coating 2 and coating 3 can act as a diaphragm, thereby reducing the danger caused by diaphragm breakage , but also ensure the service life of the solid-state battery. In addition, its preparation method is relatively simple and suitable for large-scale implementation, and the cells of solid-state batteries made of it have relatively strong safety and service life.

Description

technical field [0001] The invention relates to the field of lithium-ion solid-state batteries, more specifically, it relates to an electrode sheet, a preparation method thereof and a solid-state battery with the electrode sheet. Background technique [0002] Lithium-ion secondary battery is a clean and high-performance energy source, which has the advantages of no memory effect, long cycle life, high energy density, high working voltage, small self-discharge, light weight, etc., so it is more and more widely used. At present, more and more automobile companies have begun to release and produce electric vehicles, and the safety performance of batteries is becoming more and more important. [0003] At present, the most common way to improve safety is to use ceramic diaphragms. Ceramic diaphragms can improve the thermal shrinkage performance of the diaphragm to a certain extent, but cannot change the nature of the diaphragm shrinking when heated. Moreover, when the ambient te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/0525
CPCY02E60/10
Inventor 林久徐忠伟许晓雄夏旭东
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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