A kind of microcrystalline solid electrolyte and preparation method thereof

Abstract

The invention discloses a microcrystalline solid electrolyte, which comprises the following components in parts by weight: 10-22 parts of lithium oxide, 8-12 parts of lanthanum oxide, 10-18 parts of zirconium oxide or hafnium dioxide, 18-35 parts of boron oxide, 20-35 parts of silicon dioxide, 0.1-10 parts of tungsten trioxide and 0.01-3 parts of antimony trioxide. The preparation method of the microcrystalline solid electrolyte is also provided. The invention utilizes the phase separation of borosilicate glass, the support of large-radius ions and the coordination of unequal ions to improve the room temperature ionic conductivity of the oxide glass solid electrolyte of lithium ion batteries, and improve the room temperature ionic conductivity of the oxide glass electrolyte. conductivity.

Description

technical field [0001] The invention relates to the technical field of solid electrolytes, in particular to a microcrystalline solid electrolyte and a preparation method thereof. Background technique [0002] The solid electrolytes of lithium batteries are divided into single crystal solid electrolytes, polycrystalline solid electrolytes, microcrystalline solid electrolytes, amorphous solid electrolytes, etc. according to the material composition and structure. The preparation process of single crystal solid electrolytes is complicated, and the process control is difficult. The electrolyte is usually obtained by sintering, and it is difficult to eliminate defects such as pores. The amorphous solid electrolyte is obtained by melting and cooling, which can reduce the influence of pores, but the ionic conductivity is still not high, but after microcrystallization treatment, it can be obtained A large number of nanoscale crystallite regions can effectively enhance ion migration ...

AI Technical Summary

Problems solved by technology

The conductivity of the sulfide glass electrolyte is higher than that of the oxide glass electrolyte (~10 -2 S cm -1 ), but the chemical stability of the sulfide glass electrolyte is poor, and it is easy to absorb water and release hydrogen sulfide gas

The glassy lithium oxide solid electrolyte has good stability, and only lithium ions can migrate in its network structure. However, the ionic conductivity of the current oxide glass electrolyte is generally very small, and the room temperature conductivity is only 10. -7 ~10 -8 S cm -1 , which has become the biggest limitation for its commercial development and application in solid-state lithium-ion batteries. After microcrystallization treatment, its room temperature conductivity can be greatly improved