铬基金属氧化物电池宽温域电解液研究

Study on wide temperature range electrolytes for chromium-based metal oxide batteries

锂铬基金属氧化物电池选用了具有强氧化性的Cr8O21作为正极和强还原性的金属锂作为负极,所以该体系电池对使用的电解液要求很高。通过溶剂与金属锂的高温稳定性试验和电解液的高温稳定性试验,总结出宽温域电解液应尽量减少醚类和羧酸脂类溶剂的使用,并且需在电解液中添加成膜剂来改善界面稳定性;除此之外,通过引入高DN值(donor number)溶剂二甲基亚砜(DMSO)和小分子结构乙醚也可进一步改善电解液的低温性能。

The lithium-chromium-based metal oxide battery uses the highly oxidizing Cr8O21 as the positive electrode and the strongly reducing metallic lithium as the negative electrode,so the electrolyte used in this battery system has high requirements.This article summarized that widetemperature-range electrolytes should minimize the use of ether and carboxylic ester solvents based on experiments on the high-temperature stability of solvents and metallic lithium,as well as the hightemperature stability of the electrolyte.Additionally,the low-temperature performance of the electrolyte can be further improved by introducing high donor number(DN)solvents such as dimethyl sulfoxide(DMSO)and small molecule ethers.