Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Effect of Calcination Temperatures on the Structure and Electrochemical Characterization of Li(Ni0.5Mn0.3Co0.2)O2 as Cathode Material by Supercritical Hydrothermal Synthesis Method

초임계 수열법으로 합성한 Li(Ni0.5Mn0.3Co0.2)O2 양극 활물질의 소성 온도영향에 따른 구조 및 전기화학적 특성

  • Choo, Soyeon (Graduate School of Green Energy Technology, Chungnam National University) ;
  • Beom, YunGyeong (Department of Fine Chemical Engineering & Applied Chemistry, Chungnam National University) ;
  • Kim, Sungsu (Graduate School of Green Energy Technology, Chungnam National University) ;
  • Han, Kyooseung (Graduate School of Green Energy Technology, Chungnam National University)
  • 추소연 (충남대학교 녹색에너지기술전문대학원) ;
  • 범윤경 (충남대학교 정밀응용화학과) ;
  • 김성수 (충남대학교 녹색에너지기술전문대학원) ;
  • 한규승 (충남대학교 녹색에너지기술전문대학원)
  • Received : 2013.07.16
  • Accepted : 2013.08.09
  • Published : 2013.08.31
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Abstract

As the cathode material for li-ion battery, $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$ were synthesized by supercritical hydrothermal method and calcined $850^{\circ}C$ and $900^{\circ}C$ for 10hrs in air. The effect of temperature in the heat treatment on the powder and its performance were studied of xray diffraction pattern, SEM-image, physical properties and electrochemical behaviors. As a result, calcined at $900^{\circ}C$ material particle size more increase than calcined at $850^{\circ}C$ material, especially shows excellent electrochemical performance with initial reversible specific capacity of 163.84 mAh/g (0.1C/2.0-4.3V), 186.87 mAh/g (0.1C/2.0-4.5V) and good capacity retention of 91.49% (0.2C/2.0-4.3V) and 90.36% (0.2C/2.0-4.5V) after 50th charge/discharge cycle.

리튬이온 전지의 양극물질로써, 초임계 수열합성법을 이용해 만들어진 분말은 각각 $850^{\circ}C$와 $900^{\circ}C$ 공기 분위기에서 10시간씩 소성하여 $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$를 합성하였다. 온도를 조절함에 따라 합성된 분말은 어떠한 영향을 받는지 x-ray pattern, SEM-image, 물리적 특성과 전기화학적 거동을 관찰해 연구하였다. 그 결과, $900^{\circ}C$에서 열처리된 물질의 입자크기가 $850^{\circ}C$에서 열처리된 물질에 비해 더 큰 것으로 나타났고, 특히 초기 가역용량 163.84 mAh/g (0.1 C/2.0-4.3 V), 186.87 mAh/g (0.1 C/2.0-4.5 V)의 가역용량을 나타내면서 훌륭한 전기화학적 거동을 보였으며, 50th cycle에서도 91.49%(0.2 C/2.0-4.3 V)와 90.36%(0.2 C/2.0-4.5 V)의 높은 용량 유지율을 보였다.

Keywords

References

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