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Unlocking the energy capabilities of micron-sized LiFePO4

Author

Listed:
  • Limin Guo

    (State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yelong Zhang

    (State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jiawei Wang

    (State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences)

  • Lipo Ma

    (State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences)

  • Shunchao Ma

    (State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yantao Zhang

    (State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Erkang Wang

    (State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences)

  • Yujing Bi

    (Ningbo Institute of Materials Technology and Engineering, Chinese Academy of science)

  • Deyu Wang

    (Ningbo Institute of Materials Technology and Engineering, Chinese Academy of science)

  • William C. McKee

    (Louisiana State University)

  • Ye Xu

    (Louisiana State University)

  • Jitao Chen

    (Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University)

  • Qinghua Zhang

    (School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University)

  • Cewen Nan

    (School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University)

  • Lin Gu

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Peter G. Bruce

    (University of Oxford)

  • Zhangquan Peng

    (State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences)

Abstract

Utilization of LiFePO4 as a cathode material for Li-ion batteries often requires size nanonization coupled with calcination-based carbon coating to improve its electrochemical performance, which, however, is usually at the expense of tap density and may be environmentally problematic. Here we report the utilization of micron-sized LiFePO4, which has a higher tap density than its nano-sized siblings, by forming a conducting polymer coating on its surface with a greener diazonium chemistry. Specifically, micron-sized LiFePO4 particles have been uniformly coated with a thin polyphenylene film via the spontaneous reaction between LiFePO4 and an aromatic diazonium salt of benzenediazonium tetrafluoroborate. The coated micron-sized LiFePO4, compared with its pristine counterpart, has shown improved electrical conductivity, high rate capability and excellent cyclability when used as a ‘carbon additive free’ cathode material for rechargeable Li-ion batteries. The bonding mechanism of polyphenylene to LiFePO4/FePO4 has been understood with density functional theory calculations.

Suggested Citation

  • Limin Guo & Yelong Zhang & Jiawei Wang & Lipo Ma & Shunchao Ma & Yantao Zhang & Erkang Wang & Yujing Bi & Deyu Wang & William C. McKee & Ye Xu & Jitao Chen & Qinghua Zhang & Cewen Nan & Lin Gu & Peter, 2015. "Unlocking the energy capabilities of micron-sized LiFePO4," Nature Communications, Nature, vol. 6(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8898
    DOI: 10.1038/ncomms8898
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