Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Synthesis and Rietveld Refinement of the Cathode Material $LiFePO_4/C$ for Rechargeable Lithium Batteries

리튬 2차전지용 양극소재 $LiFePO_4/C$의 합성 및 리트벨트 구조분석

  • 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)
  • 황길찬 (경상대학교 지구환경과학과 및 경상대학교 기초과학연구소) ;
  • 최진범 (경상대학교 지구환경과학과 및 경상대학교 기초과학연구소) ;
  • 김재광 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 안주현 (경상대학교 생명화학공학과 및 공학연구원)
  • Published : 2009.03.31
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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.

개량된 MA법으로 합성된 $LiFe(PO_4)/C$에 대해 X-선 회절분석을 실시하여 리트벨트법에 의해 결정학적 연구를 수행하였다. 리트벨트 계산 결과 리트벨트 R 지수 값은 $R_p=8.14%,\;R_{wp}=11.1%,\;R_{exp}=9.09%,\;R_B=3.88%$, S (GofF, Goodness of fit) = 1.2으로 계산이 잘 이루어졌음을 알 수 있다. $LiFePO_4/C$는 공간군 Pnma를 가지며, 격자상수 값은 a = 10.3229(3)${\AA}$, b = 6.0052(2) ${\AA}$, c = 4.6939(1) ${\AA}$이고 체적값은 V = 290.98(1) ${\AA}^3$으로 기존 다른 합성법의 연구결과와 잘 일치한다. 분말 입자는 고순도를 가지고 나노 크기($65{\sim}90nm$)로 기존 MA법보다 상대적으로 미세하고 균질도가 향상되었다. 따라서 개량된 MA법은 상업용 리튬 2차 전지의 양극물질 생산을 위한 우수한 제조법으로 판단된다.

Keywords

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