In situ analysis of interfacial reactions between negative MCMB,lithium electrodes,and gel polymer electrolyte |
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Authors: | Yan Cheng Guan Wang Manming Yan Zhiyu Jiang |
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Institution: | (1) Department of Chemistry, Fudan University, Shanghai 200433, People’s Republic of China;(2) Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People’s Republic of China |
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Abstract: | The interfacial properties of mesocarbon-microbeads (MCMB) and lithium electrodes during charge process in poly (vinylidenefluoride-co-hexafluoropropylene)-based gel electrolyte were investigated by in situ Raman microscopy, in situ Fourier transform-infrared (FTIR) spectroscopic methods, and charge–discharge, electrochemical impedance spectroscopy techniques. For MCMB electrode, the series phase transitions from initial formation of the dilute stage 1 graphite intercalation compound (GIC) to a stage 4 GIC, then through a stage 3 to stage 2, and finally to stage 1 GIC was proved by in situ Raman spectroscopic measurement. The formation of solid electrolyte interface (SEI) films formed on MCMB and metal lithium electrode was studied by in situ reflectance FTIR spectroscopic method. At MCMB electrode surface, the solvent (mostly ethylene carbonate) decomposed during charging process and ROCO2Li may be the product. ROCO2Li, ROLi, and Li2CO3 were the main composites of SEI film formed on lithium electrode, not on electrodeposited lithium electrode or lithium foil electrode. |
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Keywords: | In situ Raman spectroscopy In situ FTIR spectroscopy Solid electrolyte interface Gel electrolyte Mesocarbon microbeads |
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