Elastic solid electrolyte material and preparation method thereof

Abstract

The invention discloses an elastic solid electrolyte material and a preparation method thereof. The elastic solid electrolyte material comprises a rubber matrix and a metal salt, the metal salt is dispersed in the rubber matrix, the rubber matrix is obtained by reaction of a rubber material and an ionic liquid, the rubber material and the ionic liquid both contain unsaturated chemical bonds, and molecules of the ionic liquid are grafted on a molecular chain of a rubber material through addition reaction of unsaturated chemical bonds to obtain a rubber matrix. On one hand, the characteristic of high elasticity of a rubber material is reserved, and on the other hand, the composite material also has excellent ion conduction performance and is particularly suitable for preparing a flexible or foldable solid-state battery, and the application range of the solid-state battery is greatly expanded.

Description

technical field [0001] The invention belongs to the field of solid-state batteries, and more specifically relates to an elastic solid-state electrolyte material for solid-state batteries and a preparation method thereof. Background technique [0002] A solid-state battery is a battery that uses solid electrodes and a solid electrolyte. In traditional lithium-ion batteries, separators and electrolytes are required, which together account for nearly 40% of the volume and 25% of the mass of the battery. And if they are replaced with solid electrolytes, the distance between the positive and negative electrodes (traditionally filled by diaphragm electrolyte, now filled by solid electrolyte) can be shortened to even only a few to a dozen microns, so that the thickness of the battery can be greatly improved. The ground is reduced - so the all-solid-state battery technology is the only way for the miniaturization and thinning of batteries. After using all-solid-state electrolytes,...

AI Technical Summary

Problems solved by technology

First of all, the solid polymer electrolyte (such as PEO / LiTFSI) used between the electrodes of lithium metal batteries has poor lithium conductivity, and it is difficult to support the battery system to charge and discharge at a high rate at room temperature; secondly, the volume of the metal lithium negative electrode changes during the charge and discharge process The rate is large, resulting in unstable solid-solid contact between the electrode and the solid electrolyte, resulting in short cycle life, low energy density, and low power density of solid-state lithium metal batteries at room temperature; again, existing lithium metal batteries with high lithium-conducting properties Solid-state electrolytes are mainly brittle ceramic materials, whose mechanical properties are difficult to meet the application requirements of flexible ultra-thin solid-state lithium metal batteries

These problems will hinder the further practical application of solid-state lithium metal batteries

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