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Electrolyte for preventing micro short circuit of solid-state battery, solid-state battery and preparation method

A technology of solid-state battery and electrolyte, which is applied in the field of solid-state battery and preparation, electrolyte and solid-state battery, and electrolyte to prevent micro-short circuit of solid-state battery, and can solve problems such as large self-discharge and unfavorable battery storage.

Active Publication Date: 2021-09-14
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the existing solid-state battery technologies is to coat a layer of LLZTO and PEO composite coating on the positive and negative pole pieces. Due to the absence of a separator and the lack of compactness of the coating, there is a micro-short circuit phenomenon in the battery cell, resulting in a large self-discharge, which is not conducive to the storage of batteries

Method used

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  • Electrolyte for preventing micro short circuit of solid-state battery, solid-state battery and preparation method
  • Electrolyte for preventing micro short circuit of solid-state battery, solid-state battery and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides an electrolyte solution for preventing micro-short circuit of solid-state batteries, including 1 mol / L LiTFSI, DMC:EC mixed solvent with a volume ratio of 3:1 and PVDF-HFP accounting for 3% of the total mass of the electrolyte.

[0031] Through the existing process of preparing solid-state batteries, the negative electrode sheet and the positive electrode sheet are obtained;

[0032] According to LLZTO:PEO:LiTFSI with a mass ratio of 9:1:0.3, add LiTFSI to the solvent to disperse evenly, then add PEO to continue to disperse evenly, add LLZTO in three times, pass through a 160-mesh sieve to obtain a coating slurry after dispersing evenly, and Coating the coating slurry onto the surface of the negative electrode sheet, and rolling after drying to obtain a negative electrode sheet coated with a coating on the surface;

[0033] Laminate the above-mentioned negative electrode sheet and positive electrode sheet, then inject the above-mentioned electro...

Embodiment 2

[0035] This embodiment provides an electrolyte solution for preventing micro-short circuit of solid-state batteries, including 0.9 mol / L LiDFOB, DMC:EC mixed solvent with a volume ratio of 3:1 and PVDF accounting for 4% of the total mass of the electrolyte.

[0036] Through the existing process of preparing solid-state batteries, the negative electrode sheet and the positive electrode sheet are obtained;

[0037] According to LLZTO:PEO:LiTFSI with a mass ratio of 9:1:0.3, add LiTFSI to the solvent to disperse evenly, then add PEO to continue to disperse evenly, add LLZTO in three times, pass through a 160-mesh sieve to obtain a coating slurry after dispersing evenly, and Coating the coating slurry onto the surface of the negative electrode sheet, and rolling after drying to obtain a negative electrode sheet coated with a coating on the surface;

[0038] The above-mentioned negative electrode sheet and positive electrode sheet are stacked, and then the above-mentioned electroly...

Embodiment 3

[0040] This embodiment provides an electrolyte solution for preventing micro-short circuit of solid-state batteries, including 1.2mol / L LiPF 6 , DMC:EC mixed solvent with a volume ratio of 3:1 and PVDF-HFP accounting for 5% of the total mass of the electrolyte.

[0041] Through the existing process of preparing solid-state batteries, the negative electrode sheet and the positive electrode sheet are obtained;

[0042] According to LLZTO:PEO:LiTFSI with a mass ratio of 9:1:0.3, add LiTFSI to the solvent to disperse evenly, then add PEO to continue to disperse evenly, add LLZTO in three times, pass through a 160-mesh sieve to obtain a coating slurry after dispersing evenly, and Coating the coating slurry onto the surface of the negative electrode sheet, and rolling after drying to obtain a negative electrode sheet coated with a coating on the surface;

[0043] Laminate the above-mentioned negative electrode sheet and positive electrode sheet, then inject the above-mentioned elec...

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Abstract

The invention provides an electrolyte for preventing micro short circuit of a solid-state battery, a solid-state battery and a preparation method. after electrolyte is injected, the electrolyte is made to stand still, so that a ceramic coating and an electrode active substance are infiltrated by the electrolyte; and PVDF (or PVDF-HFP and other polyvinylidene fluoride polymers or copolymers) and LLZTO are subjected to a chromogenic reaction to generate PVDF-LLZTO gel, the electrolyte is changed into a gel state, a weak part and a micro-short-circuit part in the ceramic coating are filled, and the lithium salt, the DMC and other solvents in the gel can play a role in conducting lithium ions, so that the weak part and the micro-short-circuit part of the coating are repaired.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and relates to an electrolyte and a solid-state battery, in particular to an electrolyte, a solid-state battery and a preparation method for preventing the micro-short circuit of the solid-state battery. Background technique [0002] With the gradual expansion of the application range of lithium-ion batteries, everyone has put forward higher requirements for the safety performance, service life and energy density of batteries. However, the safety of lithium-ion batteries has always been a concern due to the side reactions of the liquid electrolyte at the electrode interface and the leakage of the electrolyte. The solid-state batteries assembled with solid electrolytes can effectively solve the safety hazards caused by liquid electrolytes. Solid electrolytes are non-volatile and non-flammable, thus improving the safety performance of lithium-ion batteries; and solid electrolytes can ...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0567H01M10/0525
CPCH01M10/0566H01M10/0567H01M10/0525H01M2300/0088Y02E60/10
Inventor 杨东辉刘桃松陈冬屠芳芳
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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