Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO 4 Materials

The lithium ion diffusion coefficients of bare, carbon-coated and Cr-doped LiFePO_4 were obtained by fitting the discharge curves of each half cell with Li metal anode. Diffusion losses at discharge curves were acquired with experiment data and fitted to equations. Theoretically fitted equations sho...

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Bibliographic Details
Published in:Bulletin of the Korean Chemical Society 2011, 32(3), , pp.852-856
Main Authors: Yu, Seung-Ho, Park, Chang-Kyoo, Jang, Ho, Shin, Chee-Burm, Cho, Won-Il
Format: Article
Language:English
Subjects:
화학
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Summary:The lithium ion diffusion coefficients of bare, carbon-coated and Cr-doped LiFePO_4 were obtained by fitting the discharge curves of each half cell with Li metal anode. Diffusion losses at discharge curves were acquired with experiment data and fitted to equations. Theoretically fitted equations showed good agreement with experimental results. Moreover, theoretical equations are able to predict lithium diffusion coefficient and discharge curves at various discharge rates. The obtained diffusion coefficients were similar to the true diffusion coefficient of phase transformation electrodes. Lithium ion diffusion is one of main factors that determine voltage drop in a half cell with LiFePO_4 cathode and Li metal anode. The high diffusion coefficient of carbon-coated and Cr-doped LiFePO_4 resulted in better performance at the discharge process. The performance at high discharge rate was improved much as diffusion coefficient increased. KCI Citation Count: 6
ISSN:0253-2964
1229-5949
DOI:10.5012/bkcs.2011.32.3.852