Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Effect of Synthesis Conditions on the Electrochemical Properties of LiFePO4 for Cathode Material of Secondary Lithium Ion Batteries

리듐 2차 전지용 약극활물질 LiFePO4의 합성 조건에 다른 전기화학적 특성

  • 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)
  • 김도균 (경북대학교 무기재료공학과) ;
  • 박현민 (한국표준과학연구원) ;
  • 정연욱 (경북대학교 무기재료공학과) ;
  • 이준형 (경북대학교 무기재료공학과) ;
  • 김정주 (경북대학교 무기재료공학과)
  • Published : 2006.02.01
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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.

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References

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