Electrical Characteristics of Cathode Li(<TEX>$Mn_{1-delta}$</TEX><TEX>$M_{delta}$</TEX>)<TEX>$_2$</TEX><TEX>$O_4$</TEX> Substituted by Transition Metals in Li-Ion Secondary Batteries

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J. Korean Ceram. Soc. > Volume 37(5); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(5): 466.

전이금속 치환 리튬이온 이차전지 정극 Li($Mn_{1-delta}$$M_{delta}$)$_2$$O_4$의 전기적 특성

박재홍, 김정식, 유광수

서울시립대학교 재료공학과

Electrical Characteristics of Cathode Li($Mn_{1-delta}$$M_{delta}$)$_2$$O_4$ Substituted by Transition Metals in Li-Ion Secondary Batteries

ABSTRACT

As cathode materials of LiMn2O4-based lithium-ion secondary batteries, Li(Mn1-$delta$M$delta$)2O4 (M=Ni and Co, $delta$=0, 0.05, 0.1 and 0.2) materials which Co and Ni are substituted for Mn, were syntehsized by the solid state reaction at 80$0^{circ}C$ for 48 hours. No second phases were formed in Li(Mn1-$delta$M$delta$)2O4 system with substitution of Co. However, substitution of Ni caued to form a second phase of NiO when its composition exceeded over 0.2 of $delta$ in Li(Mn1-$delta$M$delta$)2O4. As the results of charging-discharging test, the maximum capacity of Li(Mn1-$delta$M$delta$)2O4 appeared in $delta$=0.1 for both Co and Ni. Also, Li(Mn1-$delta$M$delta$)2O4 electrode showed higher capacity and better cycle performance than LiMn2O4.

Key words: Li-ion (secondary) abrreries, ${LiMn_2}{O_4}$, Electrochemical reaction, Charging-discharging test, Jahn-Teller effect