Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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The Studies of Structural Stability of LiNi0.5Mn1.5O4 Spinel

스피넬 LiNi0.5Mn1.5O4 양극 활물질의 구조 안정성 연구

  • Park, Sung-Bin (Dept. of Materials Science & Engineering College of Engineering, Korea University) ;
  • Kim, Yool-Koo (Dept. of Materials Science & Engineering College of Engineering, Korea University) ;
  • Lee, Wan-Gyu (Dept. of Materials Science & Engineering College of Engineering, Korea University) ;
  • Cho, Won-Il (Eco-Nano Research Center, Korea Institute of Science and Technology) ;
  • Jang, Ho (Dept. of Materials Science & Engineering College of Engineering, Korea University)
  • 박성빈 (고려대학교 신소재공학부) ;
  • 김율구 (고려대학교 신소재공학부) ;
  • 이완규 (고려대학교 신소재공학부) ;
  • 조원일 (한국과학기술 연구원) ;
  • 장호 (고려대학교 신소재공학부)
  • Received : 2007.10.17
  • Published : 2008.03.22
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Abstract

The stability of the cathode materials for Li secondary battery is an important factor for its cyclability. The present paper focuses on the structural stability of $LiNi_{0.5}Mn_{1.5}O_4$ during lithiation/delithiation of Li ions and compared to that of $LiMn_{2}O_4$. $LiMn_{2}O_4$ and $LiNi_{0.5}Mn_{1.5}O_4$ powders are synthesized using a solgel method and their structural and electrochemical properties are investigated by XRD, SEM, and charge-discharge tests. $Li_xMn_2O_4$ and $Li_xNi_{0.5}Mn_{1.5}O_4$(x = 0.9,0.5,0.1) specimens are obtained after charge/discharge tests by controlling the cut-off voltage for XRD and TEM investigation. The charge-discharge tests shows that initial capacity of $LiNi_{0.5}Mn_{1.5}O_4$ is 125 mAh/g and that of LiMn2O4 is around 100 mAh/g. The capacity of $LiNi_{0.5}Mn_{1.5}O_4$ is maintained 95% of its initial capacity whereas the capacity of $LiMn_{2}O_4$ is maintained 65% of its initial capacity.

Keywords

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