Synthesis of Layered-Structure LiMn1–xCrxO2 by the Pechini Method

Authors

Z. P. Guo, University of WollongongFollow
S. Zhong, University of Wollongong
G. X. Wang, University of WollongongFollow
G. W. Walter, University of Wollongong
Hua-Kun Liu, University of WollongongFollow
S. X. Dou, University of WollongongFollow

RIS ID

8029

Publication Details

This articles was originally published as Guo, ZP, Zhong, S, Wang, GX et al, Synthesis of Layered-Structure LiMn1–xCrxO2 by the Pechini Method and Characterization as a Cathode for Rechargeable Li/LiMnO2 Cells, Journal of the Electrochemical Society, 149(6), 2002, A792-A795. Copyright The Electrochemical Society. Original journal available here.

Abstract

LiMn_1-xCr_xO₂ compounds with an α-NaFeO₂ layer-type crystal structure have been prepared by the Pechini method. The effects of ethylene glycol (EG) content and calcination temperature on powder characteristics and electrochemical performance are evaluated. It is found that the homogeneity of the powder is increased by increasing the molar ratio of EG to citric acid, and a trace of MnO can be detected in the powder calcined below 800°C for 4 h. Compared with the ss-LiMn_1-xCr_xO₂ powder (made by the solid-state reaction), the p-LiMn_1-xCr_xO₂ compound (made by the Pechini method) yielded higher specific capacity for both charge and discharge, and the rate capability has been improved due to the smaller particle size and good homogeneity. The evolution of discharge curves with cycling shows that less additional spinel-type tetrahedral sites for Li formed during cycling of the p-LiMn_1-xCr_xO₂ compound.