TY - JOUR
T1 - Study of LiFePO4 by cyclic voltammetry
AU - Yu, Denis Y. W.
AU - Fietzek, Christopher
AU - Weydanz, Wolfgang
AU - Donoue, Kazunori
AU - Inoue, Takao
AU - Kurokawa, Hiroshi
AU - Fujitani, Shin
PY - 2007
Y1 - 2007
N2 - A systematic study of LiFePO4 with cyclic voltammetry (CV) was conducted using thin electrodes with a loading of 4 mg cm2. Peak current of the CV profile was proportional to the square root of scan rate under 0.2 mVs. Results were analyzed using a reversible reaction model with a resistive behavior. This resistance was consistent with other resistances obtained from electrochemical impedance spectroscopy and charge-discharge curves. Apparent Li diffusion constants of 2.2× 10-14 and 1.4× 10-14 cm2 s were obtained at 25°C for charging and discharging LiFePO4 electrodes in 1 M LiPF6 ethylene carbonate/diethyl carbonate=3:7 by volume, respectively. Activation energies of the apparent diffusion constants and electrode resistance are about 0.4 eV. These parameters are good indicators for assessing the effectiveness of material modifications such as surface coating and doping. © 2007 The Electrochemical Society.
AB - A systematic study of LiFePO4 with cyclic voltammetry (CV) was conducted using thin electrodes with a loading of 4 mg cm2. Peak current of the CV profile was proportional to the square root of scan rate under 0.2 mVs. Results were analyzed using a reversible reaction model with a resistive behavior. This resistance was consistent with other resistances obtained from electrochemical impedance spectroscopy and charge-discharge curves. Apparent Li diffusion constants of 2.2× 10-14 and 1.4× 10-14 cm2 s were obtained at 25°C for charging and discharging LiFePO4 electrodes in 1 M LiPF6 ethylene carbonate/diethyl carbonate=3:7 by volume, respectively. Activation energies of the apparent diffusion constants and electrode resistance are about 0.4 eV. These parameters are good indicators for assessing the effectiveness of material modifications such as surface coating and doping. © 2007 The Electrochemical Society.
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U2 - 10.1149/1.2434687
DO - 10.1149/1.2434687
M3 - RGC 21 - Publication in refereed journal
SN - 0013-4651
VL - 154
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 4
ER -
