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

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, RCH_xOLi, and ROCO₂Li.