Stabilization of LiMn2O4 Electrode for Lithium Secondary Bttery (II) -Stability of Substituted LiMn2O4 in Aqueous System-

리튬이차전지용 정극활물질 LiMn2O4의 안정화(II) -수용액계에서 치환형 LiMn2O4의 안정성-

  • Lee, Jin-Sik (Department of Chemical Engineering, Dankook University) ;
  • Lee, Chul-Tae (Department of Chemical Engineering, Dankook University)
  • 이진식 (단국대학교 공과대학 화학공학과) ;
  • 이철태 (단국대학교 공과대학 화학공학과)
  • Received : 1998.11.09
  • Accepted : 1999.09.01
  • Published : 1999.10.10

Abstract

Stability of a cathode material was determined by Tafel plot in 1 M LiOH solution. The stabilized $LiM_xMn_{2-x}O_4$ (x=0.05~0.1) electrode resulted in overpotential of 0.13~0.15 mV at 100 mA. This overpotential was 0.05 mV lower than that of the spinel structured $LiMn_2O_4$ electrode. Conductivity test at various potentials showed that the conductivity of $LiM_xMn_{2-x}O_4$ was higher than that of the spinel structured $LiMn_2O_4$ and the bulk resistance of $LiM_xMn_{2-x}O_4$ due to the dissolution of $Mn^{2+}$ was lowered.

Keywords

tafel plot;overpotential;$Mn^{2+}$ dissolution

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