Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrochemical Properties of LiMn1.92Co0.08O4 and LiNi0.7Co0.3O2 Mixtures Prepared by a Simplified Combustion Method

단순화한 연소법에 의해 합성한 LiMn1.92Co0.08O4와 LiNi0.7Co0.3O2 혼합물의 전기화학적 특성

  • Song, Myoungyoup (Division of Advanced Materials Engineering, Research Center of Advanced Materials Development. Engineering Research Institute, Chonbuk National University) ;
  • Kwon, IkHyun (Division of Advanced Materials Engineering, Research Center of Advanced Materials Development. Engineering Research Institute, Chonbuk National University) ;
  • Kim, Hunuk (Division of Advanced Materials Engineering, Research Center of Advanced Materials Development. Engineering Research Institute, Chonbuk National University)
  • 송명엽 (전북대학교 신소재공학부 공학연구원 신소재개발연구센터) ;
  • 권익현 (전북대학교 신소재공학부 공학연구원 신소재개발연구센터) ;
  • 김훈욱 (전북대학교 신소재공학부 공학연구원 신소재개발연구센터)
  • Published : 2004.10.01
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Abstract

$LiMn_{1.92}Co_{0.08}O_4$ and $LiNi_{0.7}Co_{0.3}O_2$ synthesized by a simplified combustion method had good electrochemical properties. Mixtures $LiMn_{1.92}Co_{0.08}O_4$-x wt$\%$ $LiNi_{0.7}Co_{0.3}O_2$ (x=9, 23, 33, 41, and 47) were prepared by milling for 30 min and their electrochemical properties were investigated. The electrode with x=9 had a relatively large first discharge capacity (109.9 mAh/g at 0.1 C) and good cycling performance. The decrease in the discharge capacity of the mixture electrodes with cycling is considered to result mainly from the degradation of $LiNi_{0.7}Co_{0.3}O_2$, caused by coating of $LiNi_{0.7}Co_{0.3}O_2$ with Mn dissolved from $LiMn_{1.92}Co_{0.08}O_4$.

단순화한 연소법에 의해 합성한 $LiMn_{1.92}Co_{0.08}O_4$와 $LiNi_{0.7}Co_{0.3}O_2$의 혼합물의 전기화학적 성질을 알아보기 위하여, 30분 동안 milling하여 $LiMn_{1.92}Co_{0.08}O_4$-x wt$\%$ $LiNi_{0.7}Co_{0.3}O_2$ (x=9, 23, 33, 41, and 47) 조성의 혼합물을 제조하였다. x=9 조성의 전극이 비교적 큰 초기방전용량(109.9mAh/g at 0.1C)과 좋은 싸이클 성능을 가지고 있었다. 싸이클링에 따른 혼합물 전극의 방전용량 감소는 주로 $LiNi_{0.7}Co_{0.3}O_2$의 퇴화에 기인한다고 생각된다. $LiNi_{0.7}Co_{0.3}O_2$의 퇴화는 $LiMn_{1.92}Co_{0.08}O_4$로부터 용해된 Mn이 $LiNi_{0.7}Co_{0.3}O_2$ 입자를 둘러싸서(coating) 일어나는 것으로 판단된다.

Keywords

References

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