Electrical Characteristics of Li(Mn<TEX>$_{1-}$</TEX><TEX>$delta$</TEX>Nb<TEX>$delta$</TEX>)<TEX>$_2$</TEX>O<TEX>$_4$</TEX> Cathode Materials for Li-Ion Secondary Batteries

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J. Korean Ceram. Soc. > Volume 35(9); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(9): 995.

리튬 이온 이차전지 Cathode용 Li(Mn$_{1-}$$delta$Nb$delta$)$_2$O$_4$의 전기적 특성

오용주, 유광수

서울시립대학교 공과대학 재료공학과

Electrical Characteristics of Li(Mn$_{1-}$$delta$Nb$delta$)$_2$O$_4$ Cathode Materials for Li-Ion Secondary Batteries

ABSTRACT

As a basic study for cathode materials of {{{{ { {LiMn }_{2 }O }_{4 } }}-based lithium-ion secondary batteries Li({{{{ { { { {Mn }_{1-$delta$ }Nb }_{$delta$} )}_{2 }O }_{4 } }} ($delta$=0.05, 0.1, 0.2) materials which Nb is substituted for Mn were synthesized by the solid state reaction at 80$0^{circ}C$ and 110$0^{circ}C$ respectively. The second phase {{{{ { LiNbO}_{3 } }} appeared above $delta$=0.1 As the result of im-pedance analysis as the amount of substituted Nb increased the resistivity of grain boundary increased greatly. Compared to undoped-{{{{ { {LiMn }_{2 }O }_{4 } }} the electrical conductivity of Li({{{{ { { { {Mn }_{1-$delta$ }Nb }_{$delta$} )}_{2 }O }_{4 } }} decreased slightly but is charging capacity and potential plateau increased.

Key words: Secondary batteries, Impedance, LiMn$_2$O$_4$