Characterization of Ether Electrolytes for Rechargeable Lithium Cells

Abstract

2normalMethyl‐normaltetrahydrofuranfalse(2normalMe‐THFfalse)/LiAsF6 and several diethyl ether false(DEEfalse)/LiAsF6‐normalbased electrolytes have been characterized for their usefulness in rechargeable normalLi/TiS2 cells. This characterization has involved extended room temperature cell cycling at various depths of discharge, evaluation of rate/capacity behavior of cells at 25° and −10°C, and storage of cells at 50°C for up to one month with subsequent cycling. The thermal stability of the electrolytes at 71°C was evaluated by storage experiments in sealed tubes, followed by product analysis. The performance of 2normalMe‐THF/LiAsF6 cells far surpassed the others. The present data further substantiate previous reports from this laboratory of the superior behavior of 2normalMe‐THF/LiAsF6 solutions in rechargeable Li cells. The DEE/LiAsF6‐normalbased electrolytes are too unstable thermally to be of practical use.

RETRACTED ARTICLE: Polymer electrolytes: characteristics and peculiarities

“…In the late 1970s, lithium hexafluoroarsenate (LiAsF 6 ) was found to be superior to LiClO 4 salt as an electrolyte solute for lithium batteries [52]. For a long period, the combination of LiAsF 6 with various ethers became the most popular system under investigation [53][54][55][56][57].…”

A single-ion gel polymer electrolyte based on polymeric lithium tartaric acid borate and its superior battery performance

“…However, LiPF 6 is known to be extremely sensitive to moisture and thermally decompose at about 60°C. Its decomposition components consist of high toxic and corrosive HF, PF 5 and POF 3 , where HF can dissolve cathode active materials, PF 5 can react with electrolyte solvents and consequently bring about thermal runaway [22][23][24]. In the last few years, a kind of lithium borate salts, for example, lithium bis(oxalato) borate (LiBOB) has attracted great interest to researchers because of superior thermal stability, considerable ionic conductivity and fair dissociation constant [25][26][27].…”

Electrolytes for Lithium and Lithium-Ion Batteries

“…Oligomeric linear ethers with repeating ethylene glycol units (−CH 2 CH 2 O−) such as dimethoxyethane, diglyme, triglyme, tetraglyme [26,65,103], and cyclic ethers such as tetrahydrofuran (THF) and 2-methyltetrahydrofuran (Me-THF) [2,54] were investigated as the electrolyte components for Li metal batteries. However, aliphatic ethers suffer from low oxidation potentials [79], making them inappropriate for the majority of the SOA Li-ion chemistries.…”