Effect of Temperature on the Solubility of PC-Based Solid Electrolyte Interface on Mcmb Electrode for Lithium-Ion Batteries

Wednesday, May 14, 2014
Grand Foyer, Lobby Level (Hilton Orlando Bonnet Creek)
Y. S. Wang (National Sun Yat-sen University), H. W. Hsieh, Y. F. Lin, C. Y. Lin (Advanced Lithium Electrochemistry Co., Ltd.), and J. T. Lee (National Sun Yat-sen University)
The effects of the dissolution of propylene carbonate (PC)-based solid electrolyte interphase (SEI) in the electrolyte on temperature is investigated. The characterizations of the SEI on the anode of the Li|1.0 M LiPF6-PC/DEC (= 7/3, v/v)|MCMB cell are observed by cyclic voltammetry (CV), AC impedance, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The results show that a PC-based SEI forms on MCMB at 0 oC. The Li|MCMB cell at 0 oC can be successfully discharged and charged. The discharge and charge capacities of the MCMB electrode are 307.3 and 281.3 mAh/g, respectively. However, the SEI film is dissolved in the electrolyte as the temperature is increased to 30 oC. The results of Raman spectroscopy and XPS also confirm that the composition of the PC-based SEI consist of LiF, RCHxOLi, and ROCO2Li.