Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Stabilization of LiMn2O4 Electrode for Lithium Secondary Battery(I) - Electrode Characteristics on the Substitution of Metal Oxides in LiMn2O4 Cathode Material -

리튬이차전지용 정극활물질 LiMn2O4의 안정화(I) - LiMn2O4에 대한 금속산화물의 치환에 따른 전극 특성 -

  • Lee, Jin-Sik (Department of Chemical Engineering, College of Engineering, Dankook University) ;
  • Lee, Chul-Tae (Department of Chemical Engineering, College of Engineering, Dankook University)
  • 이진식 (단국대학교 공과대학 화학공학과) ;
  • 이철태 (단국대학교 공과대학 화학공학과)
  • Received : 1998.07.20
  • Accepted : 1998.09.12
  • Published : 1998.10.10
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Abstract

For the stabilization of the spinel structured $LiMn_2O_4$, a fraction of manganese was substituted with various metals such as Mg, Fe, V, W, Cr, Mo with Mn that had a similar ionic radii ($LiM_xMn_{2-x}O_4(0.05{\leq}x{\leq}0.02)$). The $LiM_xMn_{2-x}O_4$ showed a substantial improvement as lower capacity loss than that of the spinel structured $LiMn_2O_4$ when it was used as a cathode material. And with the partial substitution, the chemical diffusion coefficient for $LiMg_{0.05}Mn_{1.9}O_4$ and $LiCr_{0.1}Mn_{1.9}O_4$ was increased by and order of magnitude compared to that of the $LiMn_2O_4$ with spinel structure. The results showed that significant improvement can be made on the electrochemical characteristics as the structure of the $LiMn_2O_4$ electrode material was stabilized by the partial substitution.

스피넬 구조인 $LiMn_2O_4$의 안정성을 향상시키기 위해서 망간과 비슷한 이온반경을 갖는 여러 가지 금속원소, Mg, Fe, V, W, Cr, Mo들을 일부 치환하였으며 ($LiM_xMn_{2-x}O_4(0.05{\leq}x{\leq}0.02)$), 이 결과 $LiM_xMn_{2-x}O_4$ 정극은 정극물질로 사용할 경우 $LiMn_2O_4$보다 낮은 용량감소를 나타냈다. 그리고 화학확산계수의 측정 결과 $LiMg_{0.05}Mn_{1.9}O_4$와 $LiCr_{0.1}Mn_{1.9}O_4$의 화학확산계수는 $LiMn_2O_4$보다 약 10배 이상 크게 나타났다. 이러한 결과를 볼 때 $LiMn_2O_4$에 여러 가지 금속원소를 치환시킴으로 구조적인 안정화로 인한 전기화학적 성능을 향상시킬 수 있었다.

Keywords

Acknowledgement

Supported by : 단국대학교

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