Abstract: Succinic anhydride（SA） was selected as an additive to improve the charge-discharge efficiency in lithium-ion bat- teries.The base electrolyte is 1 mol/L LiPF6/［ethylene carbonate（EC）+diethyl carbonate（DMC）+ethyl-methyl carbonate （EMC）］（volume ratio of 1∶1∶1）.Constant current charge-discharge test，cyclic voltammeter curves，linear sweep voltammetry （LSV），and electrochemical impedance spectra（EIS） were used to investigate the influence of SA on electrochemical stabi- lity window of electrolytes as well as the compatibility of SA with LiMn2O4 electrode.Results showed the capacity of LiMn2O4/Li cell using electrolyte with 2%（mass fraction） SA was increased，whether it was at room temperature or high temperature. The electrolyte with SA had a lower oxidative stability than base electrolyte and thus decomposed first and reduced the pola- rization of LiMn2O4/Li cell.Meanwhile，SA could also reduce the impedance of the cells in the cycles.

Key words: succinic anhydride, charge-discharge efficiency, electrolyte, impedance