DINITRILE-BASED LIQUID ELECTROLYTES

摘要

A liquid electrolyte having liquid dinitrile (e.g. succinonitrile (SCN)) and an ionic salt may be used in an electrochemical device. The liquid electrolyte may comprise one or more ionic salts dissolved in the dinitrile such that the melting point of the dinitrile is depressed to below the operating temperature. Alternatively, the liquid electrolyte may comprise one or more ionic salts dissolved in a mixture of dinitrile and a co-solvent. Electrochemical devices have a cathode, an anode, and a liquid electrolyte having liquid dinitrile and an ionic salt. Such devices have good ionic conductivities, a stable electrolyte interface and good thermal stability over a broad potential window combined with high energy density delivery capacity and higher flash points than conventional liquid electrolytes.