Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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AC Impedance analysis and charge/discharge characteristics of $LiMn_2O_4$ cathode according to conductive agent

도전재 종류에 따른 $LiMn_2O_4$정극의 AC Impedance 측정 및 충방전 특성

  • Jeong, I.S. (Dept. of Electrical Eng. chonnam National Univ) ;
  • Sung, C.H. (Dept. of Electrical Eng. chonnam National Univ) ;
  • Park, B.G. (Dept. of Electrical Eng. chonbuk sanup Univ) ;
  • Gu, H.B. (Dept. of Electrical Eng. chonnam National Univ)
  • 정인성 (전남대학교 전기공학과) ;
  • 성창호 (전남대학교 전기공학과) ;
  • 박복기 (전북산업대학 전기공학과) ;
  • 구할본 (전남대학교 전기공학과)
  • Published : 1997.07.21
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Abstract

$LiMn_2O_4$ is prepared by reacting stoichiometric mixture of LiOH $H_2O$ and $MnO_2$ (mole ratio 1 : 2) and calcinating at $800^{\circ}C$ for 24h, 36h, 48h, 60h and 72h. At X-ray diffraction, cathode active materials calcined at $800^{\circ}C$ for 36h. (111)/(311) peak ratio was 0.37. It was that crystal structure is formed very well. In the result of charge/discharge test, when heated at $800^{\circ}C$ for 36h, charge/discharge characteristics of $LiMn_2O_4$ is the best and Super-s-black sort of conductive agent showed well property. Also, AC impedance creased gradually during cycling and stabilized after 10cycle.

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