Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A study on the Spinel phase cathode materials with high capacity for lithium secondary batteries

리튬 2차 전지용 고용량 스피넬계 양극물질 연구

  • Hong, Ki-Joo (Department of applied chemistry, Hanyang university) ;
  • Sun, Yang-Kook (Department of applied chemistry, Hanyang university)
  • 홍기주 (한양대학교 응용화학공학부) ;
  • 선양국 (한양대학교 응용화학공학부)
  • Published : 2001.11.16
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Abstract

As 3V cathode material, a new doping spinel material, LiMn1.6Se0.4O4 powder with a phase-pure polycrystalline was synthesized by a sol-gel method. In spite of Jahn-teller distortion in 3V region($2.4{\sim}3.5V$), the LiMn1.6Se0.4O4 electrode shows no capacity loss. The material in the 3V region initially delivers a discharge capacity of 100mAh/g which increase with cycling to reach 105mAh/g after 90cycles. And 5V cathode material LiNi0.5-xMxMn1.5O4(M=Cr, V, Fe) compounds have been synthesized by sol-gel method. a series of electroactive spinel compounds, LiNi0.5-xMxMn1.5O4(M=Cr, V, Fe) has been studied by crystallographic and electrochemical methods. The material presents only one plateau at around 4.5 V vs. Li/Li+ with a large discharge capacity of 152mAh/g and fairly good cyclability.

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