Thermal and spectroscopic studies of LiCoO_2 in li-ion rechargeable batteries

摘要

Cathode from Li-ion rechargeable batteries was studied using both infrared spectroscopy and thermal gravimetric analysis. Correlation between cycle performance with infrared spectral fetures and TGA thermograms was found to be attributed to: (1) electrolyte/solvent uptake on cathode during cycles that permanently consumes electrolyte/solvent; and (2) incomplete discharge/charge conversion that results in irreversible capacity loss and short cycle life. FTIR and MS were also used to identify off-gases durign TGA data acquisition.