Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Properties of LiMPO4(M = Fe, Mn) Synthesized by Sol-Gel Method

졸-겔법에 의해 제조된 LiMPO4(M = Fe, Mn) 양극 활물질의 전기화학적 특성

  • Kim, Jae-Kwang (Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University) ;
  • Baek, Dong-Ho (Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University) ;
  • Shin, Yong-Jo (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) ;
  • Seo, Yang-Gon (Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University) ;
  • Kim, Chi-Su (VK-EIG) ;
  • Yoon, Seok-Jun (VK-EIG) ;
  • Cho, Myung-Hun (VK-EIG)
  • 김재광 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 백동호 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 신용조 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 안주현 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 서양곤 (경상대학교 생명화학공학과 및 공학연구원) ;
  • 김지수 (브이케이이아이지주식회사) ;
  • 윤석준 (브이케이이아이지주식회사) ;
  • 조명훈 (브이케이이아이지주식회사)
  • Published : 2008.05.31
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Abstract

Carbon-coated $LiFePO_4$ and $LiMn_{0.4}Fe_{0.6}PO_4$ cathode materials for lithium batteries were synthesized by a sol-gel method. X-ray diffraction and scanning electron microscopy data showed that the cathode materials are pure crystalline and are surrounded by porous carbon. The initial discharge capacities of $LiFePO_4$ and $LiMn_{0.4}Fe_{0.6}PO_4$ with the liquid electrolyte of 1M $LiPF_6$ in EC/DMC are 132 mAh/g and 145 mAh/g, respectively, at current density of 0.1 C-rate. $LiFePO_4$ and $LiMn_{0.4}Fe_{0.6}PO_4$ with an electrospun polymer-based electrolyte exhibit initial discharge capacities of 114 and 130 mAh/g at 0.1 C-rate at room temperature, respectively.

리튬이차전지의 양극 활물질로 카본 코팅된 $LiFePO_4$와 $LiMn_{0.4}Fe_{0.6}PO_4$를 졸-겔방법으로 합성하였다. 제조된 양극 활물질을 X-선 회절분석과 주사전자현미경을 통하여 불순물이 존재하지 않으며 기공이 잘 발달되어 있다는 것을 확인하였다. 액체전해질을 사용하여 0.1 C-rate의 전류밀도에서 충방전하였을 경우 $LiFePO_4$는 132 mAH/g, $LiMn_{0.4}Fe_{0.6}PO_4$는 145 mAh/g의 방전용량을 각각 나타내었다. 전기방사에 의해 만들어진 겔 고분자 전해질을 사용하였을 경우에 $LiFePO_4$와 $LiMn_{0.4}Fe_{0.6}PO_4$는 각각 114, 130 mAh/g의 우수한 방전용량을 나타내었다.

Keywords

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