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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 3
BKCSDE 32(3)
March 20, 2011 

 
Title
Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO4 Materials
Author
Seung Ho Yu, Chang Kyoo Park, Ho Jang, Chee Burm Shin, Won Il Cho*
Keywords
LiFePO4, Carbon coating, Cr doping, Diffusion coefficient, Fitting of the discharge curve
Abstract
The lithium ion diffusion coefficients of bare, carbon-coated and Cr-doped LiFePO4 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 LiFePO4 cathode and Li metal anode. The high diffusion coefficient of carbon-coated and Cr-doped LiFePO4 resulted in better performance at the discharge process. The performance at high discharge rate was improved much as diffusion coefficient increased.
Page
852 - 856
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