Physical, Chemical, and Electrochemical Properties of 3-Ethyl-4-propylsydnone

Sydnones are known as typical mesoionic compounds, which can be represented by the resonance hybrid of different polarized ionic structures. We have newly synthesized 3-ethyl-4-propylsydnone (EPSD) and investigated its physical, chemical, and electrochemical properties. The electron-pair donability for EPSD was higher than that for propylene carbonate (PC), though the electron-pair acceptability for EPSD was lower. The addition of EPSD to an ethylene carbonate (EC)-diethyl carbonate (DEC) equimolar binary mixture at the molar ratio of 1:1:0.05 was effective for an increase in cycling efficiency of a lithium anode.