The Electrochemical Characterization of $LiMn_{2-y}M_{y}O_4$ Cathode Material - I. Crystal Structure and AC Impedance Properties of $LiMn_{2-y}Mg_{y}O_4$

$LiMn_{2-y}M_{y}O_4$ 정극 활물질의 전기화학적 특성 - I. $LiMn_{2-y}Mg_{y}O_4$의 결정 구조 및 AC Impedance 특성

  • 정인성 (전남대학교 전기공학과) ;
  • 김종욱 (전북대학교 전자정보 사업단) ;
  • 구할본 (전남대학교 전기공학과) ;
  • 김형곤 (조선이공대학 전기과) ;
  • 손명모 (대구공업대학 세라믹공업과)
  • Published : 2001.04.01

Abstract

Crystallized $LiMn_{2-y}Mg_{y}O_4$ powder was prepared by calcing the mixture of LiOH.$H_2O$, $MnO_2$ and MgO at $800^{\circ}C$ for 36h in an air atmosphere. The structure of $LiMn_{2-y}Mg_{y}O_4$ crystallites was analyzed from powder X-ray diffraction data as a cubic spinel, space group Fd3m. Though all cathode material showed spinel phase based on cubic phase in X-ray diffraction, other peaks gradually exhibited and became intense with increasing y value in $LiMn_{2-y}Mg_{y}O_4$. However, ununiform which calculated by (111) face and (222) face was constant in spite of the increase of y value, except pure $LiMn_2O_4$. AC impedance of Li/$LiMn_{2-y}Mg_{y}O_4$ cells revealed the similar resistance of about $70\Omega$ before cycling. In addition, The impedance of Li/$LiMn_{1.9}Mg_{0.1}O_4$ cell changed during charge and discharge or after cycling.

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