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Capacity fading of LiCr0.1Mn1.9O4/MPCF cells at elevated temperature

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Abstract

Capacity fading of LiCr0.1Mn1.9O4 /MPCF (mesophase pitch-based carbon fiber) cells was investigated at elevated temperature (55 °C). The cells showed very fast capacity fading, keeping only 60% of capacity retention at the 100th cycle at 55 °C. The cycled electrodes and the electrolyte were analyzed using electrochemical test, inductively coupled plasma, and X-ray diffraction. Results of the analyses indicated that LiCr0.1Mn1.9O4 exhibited good effects on restraint of Mn dissolution and stabilization of structure at 55 °C. The cycled LiCr0.1Mn1.9O4 electrode and the cycled MPCF electrode presented good electrochemical performance again with fresh electrolyte. Therefore, it was proposed that the cycling fading of LiCr0.1Mn1.9O4/MPCF cells was mainly caused by decomposition of electrolyte upon LiCr0.1Mn1.9O4 electrode during cycling. It was found that the decomposition of electrolyte led to the formation of a surface layer comprised of Li2CO3, Li x PF y , CH3OCO2Li or (CH2OCO2Li)2, polymeric ether etc. The formation of this film consumed active lithium ions, leading to fast capacity fading of LiCr0.1Mn1.9O4/MPCF cell at elevated temperature.

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Authors and Affiliations

  1. School of Material and Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, People’s Republic of China

    Jiangang Li & Maosong Fan

  2. Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing, 100084, People’s Republic of China

    Jiangang Li, Xiangming He, Chunrong Wan & Changin Jiang

  3. School of Material Science and Engineering, Beihang University, Beijing, 100083, People’s Republic of China

    Shichao Zhang

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  1. Jiangang Li
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  2. Xiangming He
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  3. Maosong Fan
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  5. Changin Jiang
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Correspondence to Xiangming He.

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Li, J., He, X., Fan, M. et al. Capacity fading of LiCr0.1Mn1.9O4/MPCF cells at elevated temperature. Ionics 12, 153–157 (2006). https://doi.org/10.1007/s11581-006-0019-1

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  • DOI: https://doi.org/10.1007/s11581-006-0019-1

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