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Synthesis and Rietveld Refinement of the Cathode Material $LiFePO_4/C$ for Rechargeable Lithium Batteries  

Hwang, Gil-Chan (Department of Earth and Environmental Sciences and Research Institute of Natural Sciences, Gyeongsang National University)
Choi, Jin-Beom (Department of Earth and Environmental Sciences and Research Institute of Natural Sciences, Gyeongsang National University)
Kim, Jae-Kwang (Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University)
Ahn, Jou-Hyeon (Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.22, no.1, 2009 , pp. 63-72 More about this Journal
Abstract
Carbon-coated lithium iron phosphate ($LiFePO_4/C$) composites are synthesized by the modified mechanical activation method (modified MA process) and studied by the Rietveld structural refinement. Rietveld indices of $LiFePO_4/C$ indicate good fitting with $R_p=8.14%,\;R_{wp}=11.1%,\;R_{exp}=9.09%,\;R_B=3.88%$, and S (GofF, Goodness of fit) = 1.2, respectively. $LiFePO_4/C$ with a space group Pnma shows a = 10.3229(3)${\AA}$, b = 6.0052(2) ${\AA}$, c = 4.6939(1) ${\AA}$, and V = 290.98(1) ${\AA}^3$ in dimension, indicating good agreements with those of previous works. Synthetic powders are nano-sized ($65{\sim}90nm$) homogeneous particles with high purity. Thus the modified MA method will be an efficient process to get a high quality cathode material for commercial lithium batteries.
Keywords
$LiFePO_4/C$; lithium rechargeable battery; Rietveld refinement; modified MA method;
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