Influence of Temperature on the Performance of a Graphite Electrode
- 化学化工－已发表论文 
The first lithiation of a graphite electrode in 1 mol . L-1 LiPF6-EC (ethylene carbonate): DEC (diethyl carbonate): DMC(dimethyl carbonate) electrolyte at 25 and 60 degrees C, and in 1 mol . L-1 LiPF6-EC:DEC:DMC+5%VC (vinylene carbonate) electrolyte at 60 degrees C were investigated by electrochemical impedance spectroscopy (EIS) combined with cyclic voltammetry (CV). It was found that deterioration of the graphite electrode's electrochemical performance was mainly caused by the unstable solid electrolyte interphase (SEI) film on the electrode's surface in 1 mol . L-1 LiPF6-EC:DEC:DMC electrolyte at 60 degrees C. However, the use of VC as an additive to the above electrolyte significantly improved the electrochemical performance of the graphite electrode, which was attributed to an improvement in the stability of the SEI film that formed on the graphite electrode's surface.