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Search / Korean Journal of Chemical Engineering
Korean Chemical Engineering Research,
Vol.58, No.1, 52-58, 2020
LiNi0.8Co0.15Al0.05O2 양극활물질의 전기화학적 특성 향상을 위한 MgF2 표면처리 효과
Effect of MgF2 Surface Modification for LiNi0.8Co0.15Al0.05O2 Cathode Material on Improving Electrochemical Characteristics
진수진, 서진성, 나병기
본 연구에서는 MgF2를 이용하여 LiNi0.8Co0.15Al0.05O2 양극활물질의 표면을 코팅하여 전기화학적 특성과 열적 안정성을 평가하였다. 코팅된 MgF2의 비율은 0.5, 1, 3 wt%로 조절하였다. 전기화학적 특성은 CV, 충·방전 프로파일, 출력특성, 수명특성을 분석하였고, 열적 안정성은 DSC 분석을 통하여 이루어졌다. 전기화학적 특성 분석 결과 0.1C에서 초기 방전 용량은 MgF2 코팅이 되었을 때 감소하였지만, 2C까지 출력을 향상 시켰을 때는 약간 향상된 방전 용량을 얻을 수 있었고, 수명특성 또한 향상되었다. 또한 DSC 분석 결과 코팅이 되었을 때 발열 온도가 증가하였고, 발열 피크의 세기 또한 감소하였다.
Electrochemical characterization and thermal stability were investigated for MgF2 coated LiNi0.8Co0.15Al0.05O2 cathode. The ratio of MgF2 was controlled by 0.5, 1, 3 wt%. Cyclic voltammetry, charge-discharge profiles, rate capability, cycle life were measured for electrochemical properties. DSC analysis was measured for thermal stability. The first discharge capacities of MgF2 coated LiNi0.8Co0.15Al0.05O2 were decreased at 0.1C-rate compared to pristine LiNi0.8Co0.15Al0.05O2. But the rate capability and cycle life of MgF2 coated LiNi0.8Co0.15Al0.05O2 were improved at 2C-rate. In DSC analysis result, the exothermic temperature of MgF2 coated LiNi0.8Co0.15Al0.05O2 was increased and peak height was decreased.
Keywords: Lithium secondary battery; Cathode material; LiNi0.8Co0.15Al0.05O2; MgF2 coating; Thermal stability
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