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A LiFePO4 regeneration method based on PVAc alcoholysis reaction

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  • Guan, Lingyu
  • Liu, Meihua
  • Yu, Fan
  • Qiu, Tao
  • Zhou, Tangbangguo
  • Lin, Xu

Abstract

Regeneration of LiFePO4 from spent LiFePO4 cathode material has been proposed by using a new carbon source in the mixture system of methanol and ammonia water. Adding appropriate Li2CO3, FeC2O4, and NH4H2PO4, the spent LiFePO4 materials were regenerated through high-temperature solid-state reaction with the different amounts of PVAc. Compared with traditional regeneration methods, the addition of carbon sources was greatly reduced in this work. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), Raman spectra, X-ray photoelectron spectroscopy (XPS), and electrochemical measurement. According to these results, the regenerated sample with 2.5 wt% PVAc displayed the best morphology, structure, and electrochemical performance. It delivered a high initial capacity of 163.2 mA h g−1 at the rate of 0.1 C, and a high capacity retention of 97.08% at a rate of 0.5 C after 100 cycles, which could meet the commercial requirements of regenerated LiFePO4 batteries to a certain extent. The optimum amount of PVAc still needs further study.

Suggested Citation

  • Guan, Lingyu & Liu, Meihua & Yu, Fan & Qiu, Tao & Zhou, Tangbangguo & Lin, Xu, 2021. "A LiFePO4 regeneration method based on PVAc alcoholysis reaction," Renewable Energy, Elsevier, vol. 175(C), pages 559-567.
    • Handle: RePEc:eee:renene:v:175:y:2021:i:c:p:559-567
    DOI: 10.1016/j.renene.2021.04.129
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    Cited by:

    1. Shin, Youngjun & Kim, Seoa & Park, Sanghyuk & Lee, Jimin & Bae, Jihyeon & Kim, Dongwoo & Joo, Hyeoncheol & Ban, Sungho & Lee, Haeun & Kim, Yonghoon & Kwon, Kyungjung, 2023. "A comprehensive review on the recovery of cathode active materials via direct recycling from spent Li-ion batteries," Renewable and Sustainable Energy Reviews, Elsevier, vol. 187(C).
    2. Dmitry Agafonov & Aleksandr Bobyl & Aleksandr Kamzin & Alexey Nashchekin & Evgeniy Ershenko & Arseniy Ushakov & Igor Kasatkin & Vladimir Levitskii & Mikhail Trenikhin & Evgeniy Terukov, 2023. "Phase-Homogeneous LiFePO 4 Powders with Crystallites Protected by Ferric-Graphite-Graphene Composite," Energies, MDPI, vol. 16(3), pages 1-28, February.

    More about this item

    Keywords

    Li-ion battery; LiFePO4; Regeneration; PVAc; Alcoholysis;
    All these keywords.

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