Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Structure and Electrochemical Characterization of LiNi0.5Mn0.3Co0.2O2 as the Cathode Material Synthesized by Simple-combustion Method

단순 연소법으로 합성한 LiNi0.5Mn0.3Co0.2O2 양극 활물질의 구조 분석 및 전기화학적 특성 연구

  • Received : 2010.10.07
  • Accepted : 2010.10.25
  • Published : 2010.11.30
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Abstract

$LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$ active material was prepared by simple-combustion method and investigated as the cathode material for li-ion battery. The structural characterization was analyzed by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), respectively. The XRD patterns of $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$ sample was indicated a phase of layered hexagonal structure. The size of particles has not uniform diameters ranging from 100 to 300 nm. The electrochemical performance of the $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$ was measured by Cyclic Voltammetry and galvanostatics. The $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$ shows the discharge capacity of ~162 mAh/g in the range of 2.8 to 4.3 V at the first cycle.

$LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$의 리튬이온 이차전지 양극 물질로의 특성을 연구하기 위해서 단순 연소합성법을 이용하여 합성했다. 합성된 물질의 구조적 특징을 분석하기 위하여 X-선 회절분석(XRD)과 주사전자현미경 (FE-SEM)을 측정하였다. X-선 회절분석을 통하여 합성된 $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$시료가 육방정계 층상구조가 형성된 것을 확인하였다. FE-SEM을 통해 측정한 결과 $LiNi_{0.5}Mn_{0.3}Co_{0.2}O_2$ 입자는 일정한 형태를 가지지 않았으며 크기는 대략 100~300 nm의 크기임을 확인할 수 있었다. 그리고 전기화학적 특성을 측정하기 위하여 충 방전 용량 측정과 CV(Cyclic Voltammetry)를 측정하였다. 2.8 V에서 4.3 V까지 충 방전 용량을 측정한 결과 ~162 mAh/g의 초기 방전 용량을 가졌다.

Keywords

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