Influence of New Aprotic Electrolytes on Negative Electrode Materials for Lithium-ion Batteries

摘要

This paper briefly describes experiments which investigate mutual compatibility of aprotic solventsand negative electrode materials. The work follows the current trend of enhancing fire safety by usingnew kinds of aprotic solvents. Solvents and their mixtures used in this work have a higher flash pointthan solvents commonly used in lithium-ion batteries, e.g. sulfolane. The influence of electrolytes onthe proper operation of negative electrode materials was considered. In these experiments, graphite andlithium titanate oxide, Li4Ti5O12 were used as a negative electrode materials. Various combinations ofaprotic solvents and negative electrode materials were tested. The main objective of these experimentswas to find an aprotic electrolyte with a higher fire safety that can properly operate in a systemcontaining standard negative electrode materials, used in lithium-ion batteries. Also the stability of theSEI layer has been investigated in different electrolytes.