Asymmetry in anodic and cathodic polarization profile for LiFePO4 positive electrode in rechargeable Li ion battery

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  • NAKAYAMA Masanobu
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
  • IIZUKA Kaede
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
  • SHIIBA Hiromasa
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
  • BABA Shinji
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
  • NOGAMI Masayuki
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology

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Asymmetric kinetics in the electrochemical charge–discharge reaction has been investigated in the two-phase coexistence system at LiFePO4 positive electrodes for rechargeable Li ion batteries. The analyses of the electrochemical polarization profiles obtained by galvanostatic-pulse cycles reveals that nucleation and mass-transport is rate determining process for anodic and cathodic (charge and discharge) reaction, respectively, at high-rate conditions. We suggest that present two-phase system of LiFePO4–FePO4 forms core–shell type construction in each particle or agglomerate of particles, where LiFePO4 prefer to reside at outer shell-region of particles maybe due to smaller interfacial energy with electrolytes.

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