Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO4 Materials

Title
Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO4 Materials
Authors
류승호박창규장호신치범조원일
Keywords
LiFePO4; carbon coating; Cr doping; Diffusion coefficient; Fitting discharge curve
Issue Date
2011-03
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 32, NO 3, 852-856
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.
URI
http://pubs.kist.re.kr/handle/201004/39505
ISSN
0253-2964
Appears in Collections:
KIST Publication > Article
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