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Novel electrode slice and preparation method thereof, and solid-state battery equipped with the same

An electrode sheet, a new type of technology, 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: 2019-05-03
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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  • Novel electrode slice and preparation method thereof, and solid-state battery equipped with the same
  • Novel electrode slice and preparation method thereof, and solid-state battery equipped with the same
  • Novel electrode slice and preparation method thereof, and solid-state battery equipped with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of a novel negative plate, comprising the following steps:

[0035] Step 1, preparation of coating 1 and 2 slurry:

[0036]Weigh the powder CMC and SBR of negative electrode active material natural graphite, conductivity agent SuperP, binder, wherein, mass ratio 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 carry out vacuum degassing for 4 hours to complete the coating-2 slurry preparation of

[0037] Step 2, preparation of coating 2 and 3 slurry:

[0038] a. mix NMP and DMP with mass ratio m(NMP):m(DMF)=1:1, thereby complete the preparation of mixed solvent one;

[0039] 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 m(mixed solvent 1):m(...

Embodiment 2

[0055] A method for preparing a novel positive electrode sheet, comprising the following steps:

[0056] Step 1, preparation of coating-slurry:

[0057] Weigh the powder cellulose acetate butyrate and cyanoethyl sucrose of positive electrode active material NCM, conductivity agent KS-15, binding agent, wherein, 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;

[0058] Step 2, preparation of coating 2 slurry:

[0059] a. mix DMAc and acetone with mass ratio m (DMAc): m (acetone)=1: 1, thereby complete the preparation of mixed solvent one;

[0060] b. Stir the mixed solvent 1 at a speed of ...

Embodiment 3

[0066] A preparation method of a novel negative plate, comprising the following steps:

[0067] Step 1, preparation of coating-slurry:

[0068] Weigh the powder PMMA and PVA of silicon-carbon material, conductivity agent Ketjen black, binder, wherein, mass ratio 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;

[0069] Step 2, preparation of coating 3 slurry:

[0070] (1), in an environment with a dew point less than -20°C, mix DMAc and tetrahydrofuran with a mass ratio of m(tetrahydrofuran):m(DMAc)=1:1, thereby completing the preparation of the mixed solvent two;

[0071] (2), according to the mass ratio m ...

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Abstract

The invention discloses a novel electrode slice, which relates to the field of a lithium ion solid state battery. The electrode slice mainly comprises a current collector and a coating layer I appliedto both side surfaces of the current collector; the outer side of the coating layer I is coated with one or two of a coating layer II or a coating layer III; the coating layer I contains an electrodeactive material, a binder and a conductive agent; the coating layer II contains a lithium ion conducting material, inert powder, and the binder; and the coating layer III contains a lithium salt andthe binder. The coating II and the coating III can synchronously expand and contract with the coating I, and so, the probability of breakage is reduced, and the coating II and the coating III can actas a diaphragm, thereby reducing danger brought by fragmentation of the diaphragm, and the service life of the solid-state battery is also guaranteed. In addition, the preparation method is also relatively simple and is suitable for scale performing, and a cell of the solid-state battery prepared by the method is strong in safety and in service life.

Description

technical field [0001] The invention relates to the field of lithium-ion solid-state batteries, more specifically, it relates to a novel 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 ambie...

Claims

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Application Information

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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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