단순 연소법으로 합성한 LiNi0.5Mn0.3Co0.2O2 양극 활물질의 구조 분석 및 전기화학적 특성 연구
Structure and Electrochemical Characterization of LiNi0.5Mn0.3Co0.2O2 as the Cathode Material Synthesized by Simple-combustion Method
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초록
LiNi0.5Mn0.3Co0.2O2의 리튬이온 이차전지 양극 물질로의 특성을 연구하기 위해서 단순 연소합성법을 이용하여 합성했다. 합성된 물질의 구조적 특징을 분석하기 위하여 X-선 회절분석(XRD)과주사전자현미경 (FE-SEM)을 측정하였다. X-선 회절분석을 통하여 합성된 LiNi0.5Mn0.3Co0.2O2시료가 육방정계 층상구조가 형성된 것을 확인하였다. FE-SEM을 통해 측정한 결과 LiNi0.5Mn0.3Co0.2O2입자는 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)를측정하였다. 2.8 V에서 4.3 V까지 충·방전 용량을 측정한 결과 ~162 mAh/g의 초기 방전 용량을가졌다.
Abstract
LiNi0.5Mn0.3Co0.2O2active 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 LiNi0.5Mn0.3Co0.2O2sample 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 LiNi0.5Mn0.3Co0.2O2 was measured by Cyclic Voltammetry and galvanostatics. The LiNi0.5Mn0.3Co0.2O2 shows the discharge capacity of ~162 mAh/g in the range of 2.8 to 4.3 V at the first cycle.
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