Solid electrolyte and lithium battery cell with same, and lithium battery

Abstract

The invention relates to the field of lithium batteries, in particular to a solid electrolyte and a lithium battery cell with the solid electrolyte, and a lithium battery. The solid electrolyte includes LiMF<x>H<12-x>, wherein M is B, Ga, Al or a combination thereof. Compared with the existing solid electrolyte, a compound with F atoms has larger molecular volume, and thus can provide largerspace for the Li+ and improve the migration capability of lithium ions. Furthermore, the M-F bond can form a stable structure, so that the solid electrolyte can have high electrochemical window and flexibility, and the structural stability and cycle performance can be improved when lithium ions migrate rapidly. Based on the structural characteristics, the solid electrolyte can have higher shear modulus and Young's modulus.

Description

【Technical field】

[0001] The invention relates to the field of lithium batteries, in particular to a solid electrolyte, a lithium battery cell, and a lithium battery. 【Background technique】

[0002] Compared with traditional liquid electrolytes, all-solid electrolytes have the advantages of high mechanical strength and good safety. However, except for sulfide, the existing solid-state electrolyte systems have low lithium ion conductivity, and generally the ion conductivity at room temperature is less than 10. -3 S / cm, therefore, sulfide solid electrolyte materials have always been a research hotspot. However, the sulfide solid electrolyte is very sensitive to water and air, and the solid electrolyte material in the prior art has a large interface resistance after contacting the positive and negative electrode materials, resulting in a short cycle life.

[0003] Generally, the inorganic powder or thin film materials used in solid electrolyte materials are polycrystalline ma...

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