Study of LiFePO[sub 4] by Cyclic Voltammetry
| Autor: | Denis Y. W. Yu, Shin Fujitani, Christopher Fietzek, Kazunori Donoue, Wolfgang Weydanz, Takao Inoue, Hiroshi Kurokawa |
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| Rok vydání: | 2007 |
| Předmět: |
Horizontal scan rate
Renewable Energy Sustainability and the Environment Diffusion Diethyl carbonate Analytical chemistry Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Dielectric spectroscopy chemistry.chemical_compound Surface coating chemistry Electrode Materials Chemistry Electrochemistry Cyclic voltammetry Ethylene carbonate |
| Zdroj: | Journal of The Electrochemical Society. 154:A253 |
| ISSN: | 0013-4651 |
| DOI: | 10.1149/1.2434687 |
| Popis: | A systematic study of LiFePO 4 with cyclic voltammetry (CV) was conducted using thin electrodes with a loading of 4 mg/cm 2 . Peak current of the CV profile was proportional to the square root of scan rate under 0.2 mV/s. 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 X 10 -14 cm 2 /s were obtained at 25°C for charging and discharging LiFePO 4 electrodes in 1 M LiPF 6 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. |
| Databáze: | OpenAIRE |
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