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Overcharge Cycling Effect on the Surface Layers and Crystalline Structure of LiFePO 4 Cathodes of Li-Ion Batteries

Author

Listed:
  • Evgenii V. Beletskii

    (Institute of Chemistry, St. Petersburg State University, St. Petersburg 199034, Russia)

  • Elena V. Alekseeva

    (Institute of Chemistry, St. Petersburg State University, St. Petersburg 199034, Russia)

  • Dar’ya V. Spiridonova

    (Research Park, St. Petersburg State University, St. Petersburg 199034, Russia)

  • Andrei N. Yankin

    (Department of Nanophotonics and Metamaterials, ITMO University, St. Petersburg 197101, Russia)

  • Oleg V. Levin

    (Institute of Chemistry, St. Petersburg State University, St. Petersburg 199034, Russia)

Abstract

Electrochemical cells using LiFePO 4 cathode material are considered one of the safest and most resistant to overcharging among Li-ion batteries. However, if LiFePO 4 -based electrodes are exposed to high potentials, surface and structural changes may occur in the electrode material. In this study Li/LiFePO 4 half-cells were overcharged under different modes with variable cut-off voltages and charge currents. The change in voltage profile, discharge capacity, surface layers composition, and crystalline structure were characterized after overcharge cycles. It was demonstrated that the cathode material is resistant to short-term overcharging up to 5 V, but undergoes irreversible changes with increasing overcharge time or potential. Thus, despite the well-known tolerance of LiFePO 4 -based batteries to overcharge, a long overcharge time or high cut-off voltage leads to destructive changes in the cathode and should be avoided.

Suggested Citation

  • Evgenii V. Beletskii & Elena V. Alekseeva & Dar’ya V. Spiridonova & Andrei N. Yankin & Oleg V. Levin, 2019. "Overcharge Cycling Effect on the Surface Layers and Crystalline Structure of LiFePO 4 Cathodes of Li-Ion Batteries," Energies, MDPI, vol. 12(24), pages 1-15, December.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:24:p:4652-:d:295395
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    References listed on IDEAS

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    1. Yongming Sun & Hyun-Wook Lee & Zhi Wei Seh & Nian Liu & Jie Sun & Yuzhang Li & Yi Cui, 2016. "High-capacity battery cathode prelithiation to offset initial lithium loss," Nature Energy, Nature, vol. 1(1), pages 1-7, January.
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    Cited by:

    1. Lingyu Meng & Guofa Wang & Khay Wai See & Yunpeng Wang & Yong Zhang & Caiyun Zang & Rulin Zhou & Bin Xie, 2022. "Large-Scale Li-Ion Battery Research and Application in Mining Industry," Energies, MDPI, vol. 15(11), pages 1-31, May.

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