Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The Sintering Temperature Effect on Electrochemical Properties of LiMn2O4

  • Hwang, Jin-Tae (Department of Materials Science and Engineering, Korea University) ;
  • Park, Sung-Bin (Department of Materials Science and Engineering, Korea University) ;
  • Park, Chang-Kyoo (Department of Materials Science and Engineering, Korea University) ;
  • Jang, Ho (Department of Materials Science and Engineering, Korea University)
  • Received : 2011.07.06
  • Accepted : 2011.09.10
  • Published : 2011.11.20
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Abstract

The effect of sintering temperature on the electrochemical property of $LiMn_2O_4$ was investigated. Results showed that the particle size was increased at higher sintering temperatures while the initial capacity was decreased after high temperature sintering. Capacity fading, on the other hand, was suppressed at lower sintering temperatures since the sintering at higher temperatures (${\geq}800^{\circ}C$) increased the Mn ions with a lower oxidation state ($Mn^{+3}$), which induced structural instability during cycling due to dissolution of Mn ions into the electrolyte. In particular, $LiMn_2O_4$ sintered above $830^{\circ}C$ showed severe capacity fading (capacity loss was 38% of initial capacity) by lower coulombic efficiency due to the abnormally increased particle size.

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