Electrochemical properties of a natural graphite anode in ionic liquid and organic electrolytes was comparatively investigated. The results reveal that the organic cation reversibly inserted into and deinserted from graphene interlayer. The addition of chloroethylenene carbonate(Cl-EC) resulted in significant electrochemical enhancement. The mechanisms responsible for the electrochemical enhancement were discussed through ac impedance, SEM, and FTIR measurements.
1 Results Propylene carbonate (PC) is well known having a series of excellent properties including low melting point,wide liquid-phase range and wide electrochemical window.In addition,PC is well compatible with different cathode materials.However,the poor compatibility of PC with graphite anode limits the utilization of PC solvent into lithium ion batteries.It is generally accepted that PC molecules co-intercalate into graphite interlayer with solvated Li ions and cause exfoliation of graphite structur...
Honghe Zheng, Qunting Qu (Department of Chemistry, Henan Normal University, Xinxiang 453007, China)
