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LiFePO4 modified Li-1.02(Co0.9Fe0.1)(0.98)PO4 cathodes with improved lithium storage properties

Cited 48 time in Web of Science Cited 49 time in Scopus
Authors
Jang, Il-Chan; Son, C. G.; Yang, S. M. G.; Lee, J. W.; Cho, A. R.; Aravindan, V.; Park, Gumjae; Kang, Kisuk; Kim, W. S.; Cho, Won Il; Lee, Yun-Sung
Issue Date
2011-03
Citation
Journal of Materials Chemistry, Vol.21 No.18, pp.6510-6514
Abstract
LiCoPO4 and Li-1.02(Co0.9Fe0.1)(0.98)PO4 were prepared by conventional solid state reactions. The surface modification of Li-1.02(Co0.9Fe0.1)(0.98)PO4 particulates by LiFePO4 was successfully carried out by a dry coating procedure. TEM analysis confirmed the presence of a LiFePO4 coating layer of about 20 nm on the surface of the Li-1.02(Co0.9Fe0.1)(0.98)PO4 particles. All three cells delivered high initial discharge capacities of 122, 130 and 128 mA h g(-1) for LiCoPO4, Li-1.02(Co0.9Fe0.1)(0.98)PO4, and LiFePO4 modified Li-1.02(Co0.9Fe0.1)(0.98)PO4, respectively. However, these cells presented quite different cycle retention rates after 20 cycles, 21, 22 and 70% for LiCoPO4, Li-1.02(Co0.9Fe0.1)(0.98)PO4, and LiFePO4 modified Li-1.02(Co0.9Fe0.1)(0.98)PO4, respectively. The improved cycle retention of the LiFePO4-modified Li-1.02(Co0.9Fe0.1)(0.98)PO4 resulted from its reduced reactivity towards the electrolyte and the effective prevention of resistive layer formation on the LiCoPO4 surface during high voltage cycling.
ISSN
0959-9428
URI
https://hdl.handle.net/10371/165166
DOI
https://doi.org/10.1039/c1jm10574d
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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