Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
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Asymmetry in anodic and cathodic polarization profile for LiFePO4 positive electrode in rechargeable Li ion battery
Masanobu NAKAYAMAKaede IIZUKAHiromasa SHIIBAShinji BABAMasayuki NOGAMI
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Volume 119 (2011) Issue 1393 Pages 692-696

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Abstract

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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© 2011 The Ceramic Society of Japan
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