Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Electrochemical Properties of LiMn2O4-LiNi1/3Mn1/3Co1/3O2 Cathode Materials in Lithium Secondary Batteries

리튬이차전지 양극활물질용 LiMn2O4-LiNi1/3Mn1/3Co1/3O2의 전기화학적 특성

  • Kong, Ming Zhe (Department of Electrical Engineering, Chonnam National University) ;
  • Nguyen, Van Hiep (Research Institute of Wonkwang Electric Power Corporation) ;
  • Gu, Hal-Bon (Department of Electrical Engineering, Chonnam National University)
  • 공명철 (전남대학교 전기공학과) ;
  • ;
  • 구할본 (전남대학교 전기공학과)
  • Received : 2016.03.12
  • Accepted : 2016.04.07
  • Published : 2016.05.01
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Abstract

In this work, $LiMn_2O_4$ and $LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ cathode materials are mixed by some specific ratios to enhance the practical capacity, energy density and cycle performance of battery. At present, the most used cathode material in lithium ion batteries for EVs is spinel structure-type $LiMn_2O_4$. $LiMn_2O_4$ has advantages of high average voltage, excellent safety, environmental friendliness, and low cost. However, due to the low rechargeable capacity (120 mAh/g), it can not meet the requirement of high energy density for the EVs, resulting in limiting its development. The battery of $LiMn_2O_4-LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ (50:50 wt%) mixed cathode delivers a energy density of 483.5 mWh/g at a current rate of 1.0 C. The accumulated capacity from $1^{st}$ to 150th cycles was 18.1 Ah/g when the battery is cycled at a current rate of 1.0 C in voltage range of 3.2~4.3 V.

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