Electrical Properties and Structures of Spinel Type LiMn<TEX>$_{2-y}$</TEX>M<TEX>$_y$</TEX>O<TEX>$_4$</TEX>(M=Cr<TEX>$^{3+}$</TEX>) Doped with Transition Metal

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J. Korean Ceram. Soc. > Volume 36(9); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(9): 930.

전이금속으로 치환된 Spinel형 LiMn$_{2-y}$M$_y$O$_4$(M=Cr$^{3+}$)의 구조 및 전기적 성질

형경우, 김중헌, 권태윤¹

전주대학교 화학신소재학과
¹전주대학교 자연과학연구소

Electrical Properties and Structures of Spinel Type LiMn$_{2-y}$M$_y$O$_4$(M=Cr$^{3+}$) Doped with Transition Metal

ABSTRACT

For LiMn2O4 based spinel structures the stoichiometric reaction conditions need be considered carefully because the electrical properties depend on the structural stability. In order to obtain the homogeneous compound the Pechini process was chosen which could obtain a stoichiometry phase even low temperature and dependency of the synthetic condition on structural stability and electrochemical performance was investigated. X-ray diffraction studies showed that the compounds doped with transition metal have smaller lattice constants than those un doped. The dc conductivity was evaluated by a four probe method in the low and high temperature region respectively. The variations of basal spacings for the cathode were detected to be dependent on the extent of current flows (under dc)

Key words: Lithium rechargeable battery, LiMn$_{2-y}$M$_y$O$_4$(, Spinel structure, Conductivity, Pechni-process