Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrochemical Properties of LiNi1-yMyO2(M=Zn2+, Al3+, and Ti4+ Synthesized by Combustion Method

연소법으로 합성한 LiNi1-yMyO2(M=Zn2+, Al3+, and Ti4+ 전기화학적 특성

  • Kwon, Ikhyun (Division of Advanced Materials Engineering, Research Center of Industrial Technology, Engineering Research Institute, Chonbuk National University) ;
  • Song, Myoungyoup (Division of Advanced Materials Engineering, Research Center of Industrial Technology, Engineering Research Institute, Chonbuk National University)
  • 권익현 (전북대학교 신소재공학부 공학연구원공업기술연구센터) ;
  • 송명엽 (전북대학교 신소재공학부 공학연구원공업기술연구센터)
  • Published : 2005.04.01
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Abstract

$LiNi_{1-y}M_{y}O_{2}(M=Zn^{2+},\;Al^{3+},\;and\;Ti^{4+},\;0.000\{\le}y{\le}0.100)$ were synthesized by the combustion method by calcining in $O_{2}$ stream at $750^{\circ}C$ for 36 h. XRD analyses, observation by FE-SEM and measurement of the variation of discharge capacity with the number of cycles were carried out. The composition $LiNi_{0.99}M_{0.01}O_{2}(M=Zn^{2+},\;Al^{3+},\;and\;Ti^{4+})$ of all the compositions showed relatively good electrochemical properties. $LiNi_{0.99}M_{0.01}O_{2}$ exhibited poor crystallinity and $LiNi_{0.99}M_{0.01}O_{2}$ showed the cation mixing of large fraction. $LiNi_{0.99}M_{0.01}O_{2}$ with improved cycling performance showed good crystallinity and the cation mixing of small fraction.

산소분위기, $750^{\circ}C$서 36 h 동안 하소함으로써 연소법에 의해 $LiNi_{1-y}M_{y}O_{2}(M=Zn^{2+},\;Al^{3+},\;and\;Ti^{4+},\;0.000\{\le}y{\le}0.100)$를 합성하였다. 각 시료에 대해 XRD 분석, FE-SEM 관찰, 싸이클 수에 따른 방전 용량의 변화 조사가 행해졌다. $LiNi_{0.99}M_{0.01}O_{2}$ (M=Zn, Al, and Ti) 조성이 여러 조성 중에서 대체로 우수한 전기화학적 특성을 나타내었다. 결정성과 cation mixing의 평가에서 Zn을 치환한 경우 결정성이 나쁘게 나타났고 Ti를 치환한 경우 cation mixing이 크게 나타났으며, Al을 치환한 경우 결정성이 좋고 cation mixing이 적게 나타났다. Al을 치환한 경우 싸이클 특성이 개선되었다.

Keywords

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