음이온 치환을 이용한 Li1-xFeO2-yFyMnO2(Mn/(Mn + Fe)=0.8, 0<y<0.15)양극활물질의 합성 및 전기화학적 특성
Synthesis and Electrochemical Properties of Li1-xFeO2-yFyMnO2(Mn/(Mn + Fe)=0.8, 0<y<0.15) Cathode Materials by Anion Substitution
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Abstract
order to investigate the effect of fluorine ion in the Li1-xFeO2-LixMnO2 (Mn/(Mn+Fe) = 0.8) cathodematerial, it was synthesized Li1-xFeO2-yFy-LixMnO2 (Mn/(Mn + Fe) = 0.8, 0.05. y. 0.15) cathode materials at 350oCfor 10 hrs using solid-state method. Li1-xFeO2-yFy-LixMnO2 (Mn/(Mn + Fe) = 0.8, 0.0. y. 0.1) was composed manylarge needle-like particles of about 1-1.5m and small particles of about 50-100 nm, which were distributed amongthe larger particles. However, Li1-xFeO1.85F0.15-LixMnO2 material showed slightly different particle morphology. Theparticles of Li1xFeO1.85F0.15-LixMnO2 were suddenly increased and started to be a spherical type of particle shape.Li/Li1-xFeO1.9F0.1-LixMnO2 cell showed a high initial discharge capacity of 163 mAh/g and a high cycle retention rateof 95% after 50 cycles. The initial discharge capacity of Li/Li1-xFeO2-yFy-LixMnO2 (0.05. y. 0.15) cells increasedaccording to the increase of F content. However, the cycleability of this cell was very rapidly decreased when thesubstituted fluorine content is over 0.1. We suggested that too large amount of F ion fail to substitute into the Li1-xFeO2-LixMnO2 structure, which resulted in the severe decline of battery performance.
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