구연산염법을 이용한 LiFePO4 합성 및 전기화학특성에 관한 연구

Synthesis and Electrochemical Properties of LiFePO4 by Citrate Process

  • 김수민 (한국세라믹기술원 이천분원) ;
  • 김상훈 (한국세라믹기술원 이천분원) ;
  • 김진호 (한국세라믹기술원 이천분원) ;
  • 김응수 (한국세라믹기술원 이천분원) ;
  • 황해진 (인하대학교 세라믹공학과) ;
  • 조우석 (한국세라믹기술원 이천분원)
  • Kim, Soo-Min (Korea Institute of Ceramic Engineering & Techology) ;
  • Kim, Sang-Hun (Korea Institute of Ceramic Engineering & Techology) ;
  • Kim, Jin-Ho (Korea Institute of Ceramic Engineering & Techology) ;
  • Kim, Ung-Soo (Korea Institute of Ceramic Engineering & Techology) ;
  • Hwang, Hae-Jin (Department of Ceramic Engineering, In-ha Univ.) ;
  • Cho, Woo-Seok (Korea Institute of Ceramic Engineering & Techology)
  • 투고 : 2011.09.30
  • 심사 : 2011.10.21
  • 발행 : 2011.10.30


$LiFePO_4$ is a promising cathode material for secondary lithium batteries due to its high energy density, low cost and safety. $LiFePO_4$ was synthesized by the citrate process under reductive, neutral, and oxidative, atmospheres and the crystal structure was analyzed by X-ray powder diffraction. The samples synthesized under $N_2$ and $H_2$ atmosphere showed a single phase of a olivine structure, where the samples synthesized under $O_2$ atmosphere exhibited second phase of $Fe2O_3$. All the samples synthesized at 400, 600 and $800^{\circ}C$ under $N_2$ atmosphere presented a single phase of olivine. Residual organic material was observed for the sample synthesized at $400^{\circ}C$. There was nearly no intensity difference between the samples synthesized at $600^{\circ}C$ and $800^{\circ}C$. The electrochemical characteristic of the $LiFePO_4$ synthesized at $600^{\circ}C$ in the $N_2$ atmosphere was analyzed. The result exhibited an high discharge capacity of 160 mAh/g at the first cycle, and 155-160 mAh/g after 45 cycles.


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