Chemical and Physical Deterioration of Lithium-ion Battery

抄録

The life cycle assessment of lithium-ion (Li-ion) rechargeable battery was evaluated by charge and discharge processing. The influence of the temperature was studied during several hundred cycles of charge/discharge process of Li-ion battery. The charging capacity was observed to be decreased with increased number of cycle, especially at higher temperature of the environment of 60 °C. The cathode of Li-ion battery was found to be affected by heat stress and charge/discharge cycles by XRD analysis. The GC-FID and GC-MS studies revealed that the diethylfluorophosphate (DEFP) is a degraded product of electrolyte. Though the decomposition of ethylene carbonate (EC), a major component of the electrolyte in the Li-ion battery was not clearly found, the relative area of DEFP to that of EC was found to be increased with increased charge /discharge cycle number at 60 °C.