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http://dx.doi.org/10.4191/KCERS.2006.43.2.121

The Effect of Synthesis Conditions on the Electrochemical Properties of LiFePO4 for Cathode Material of Secondary Lithium Ion Batteries  

Kim, Do-Gyun (Department of Inorganic Materials Engineering, Kyungpook National University)
Park, Hyun-Min (New Materials Evaluation Center, Korea Research Institute of Standard and Science)
Jeong, Yeon-Uk (Department of Inorganic Materials Engineering, Kyungpook National University)
Lee, Joon-Hyung (Department of Inorganic Materials Engineering, Kyungpook National University)
Kim, Jeong-Joo (Department of Inorganic Materials Engineering, Kyungpook National University)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.2, 2006 , pp. 121-125 More about this Journal
Abstract
[ $LiFePO_4$ ] is one of the promising materials for cathode material of secondary lithium batteries due to its high energy density, low cost, environmental friendliness and safety. $LiFePO_4$ was synthesized by the solid-state reaction method at 500 - 800°C. The crystal structure of $LiFePO_4$ was analyzed by X-ray powder diffraction. The samples synthesized at 600 and $700^{\circ}C$ showed a single phase of a olivine structure. The particle sizes were increased and the specific surface areas were decreased with heating temperatures. The electrochemical performance was investigated by coin cell test. The discharge capacities at 0.1 C-rate were 118 mAh/g and 112 mAh/g at $600^{\circ}C,\;700^{\circ}C$, respectively. In an attempt to improve the electrical conductivity of cathode materials, $LiFePO_4/graphite$ composite was prepared with various graphite contents. The electrical conductivity and discharge capacity were increased with increasing the graphite contents in composite samples. The rate capabilities at high current densities were also improved.
Keywords
Li-ion batteries; Surface area; Electronic conductivity;
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