Cycling stability of commercial Li-ion batteries (LIBs) at elevated temperature is investigated in thepresent study. Galvanostatic discharge/charge cycling demonstrates that LIB shows a much fastercapacity fading at 60 °C with a low capacity retention rate of 47% after 100 cycles, in contrast to thevalue of 97% at 25 °C. Electrochemical impedance spectroscopy indicates that the internal resistanceshows a much faster increase at 60 °C than at 25 °C. Further scanning electron microscopy observationsuggests that the increase of resistance is mainly originated from the thickening of the solid electrolyteinterface on the anode surface. These results indicate that temperature has a significant effect on theperformance of LIBs, and operation of LIBs at elevated temperature should be provented.
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