Study on capacity fading of 18650 type LiCoO2-based lithium ion batteries during storage

Autor: Hai-Bin Liu, Liu-Qun Zheng, Miao Yanyue, Hai-Jun Lin, Deng-Feng Zhang, Li Shujun, Chen Shouwei
Rok vydání: 2015
Předmět:
Zdroj: Russian Journal of Physical Chemistry A. 89:894-897
ISSN: 1531-863X
0036-0244
DOI: 10.1134/s0036024415050246
Popis: The capacity fading of LiCoO2-based lithium ion batteries during storage was studied. The discharging capacity fading is attributed to the decreasing in the charging capacity at the constant current stage. After 300 cycles, the ratio of the charging capacity of batteries at the constant current stage to the total charging capacity decreases from 87.2 to 71.2%. The bounce-back voltage is closely related to the internal resistance when the battery is discharged to the cut-off voltage of 3.0 V. Batteries were disassembled in the fully discharged state, and then a assembled again in order to deeply understand the causes of the capacity fading of the cathode and anode. The results shows that the SEI film thickness increasing, breaking or repairing process at the anode could be responsible for the high bounce-back voltage, the increase of the internal resistance and the capacity fading during storage.
Databáze: OpenAIRE
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