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Effect of MgF2 Surface Modification for LiNi0.8Co0.15Al0.05O2 Cathode Material on Improving Electrochemical Characteristics

LiNi0.8Co0.15Al0.05O2 양극활물질의 전기화학적 특성 향상을 위한 MgF2 표면처리 효과

  • Jin, Su-Jin (Department of Chemical Engineering, Chungbuk National University) ;
  • Seo, Jin-Seong (Department of Chemical Engineering, Chungbuk National University) ;
  • Na, Byung-Ki (Department of Chemical Engineering, Chungbuk National University)
  • 진수진 (충북대학교 화학공학과) ;
  • 서진성 (충북대학교 화학공학과) ;
  • 나병기 (충북대학교 화학공학과)

Abstract

Electrochemical characterization and thermal stability were investigated for $MgF_2$ coated $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2$ cathode. The ratio of $MgF_2$ 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 $MgF_2$ coated $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2$ were decreased at 0.1C-rate compared to pristine $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2$. But the rate capability and cycle life of $MgF_2$ coated $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2$ were improved at 2C-rate. In DSC analysis result, the exothermic temperature of $MgF_2$ coated $LiNi_{0.8}Co_{0.15}Al_{0.05}O_2$ was increased and peak height was decreased.