화학공학소재연구정보센터
Electrochimica Acta, Vol.142, 34-42, 2014
Effect of temperature on the dissolution of solid electrolyte interface on mesocarbon microbeads electrodes in propylene carbonate-based electrolytes
The effects of temperature on the dissolution of solid electrolyte interface (SEI) films in the propylene carbonate (PC)-based electrolyte are investigated. The SEI films on the mesocarbon microbeads (MCMB) electrode of the Li vertical bar 1.0 M LiPF6-PC/DEC (= 7/3, v/v)vertical bar MCMB cell are characterized by cyclic voltammetry, scanning electron microscopy (SEM), AC impedance, X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The SEM and electrochemical results show that the MCMB electrode cannot undergo the lithiation and delithiation process at 30 degrees C due to the co-intercalation of PC and the exfoliation of MCMB. By contrast, the Li parallel to MCMB cell can be successfully discharged and charged at 0 degrees C because a PC-based SEI film forms on MCMB. The energy capacity of the MCMB electrode is 2813 mAh g(-1) at 0.2 C. However, the SEI film dissolves in the PC-based electrolyte as the temperature is increased to 30 degrees C. The results of Raman spectroscopy and XPS also confirm that the composition of the PC-based SEI formed at 0 degrees C consists of LiF, LixPFy, LixPOyFz, ROLi, and ROCO2Li. (C) 2014 Elsevier Ltd. All rights reserved.