Influence of different morphologies on electrochemical performance of spinel LiMn2O4

A controlled crystallization method was adopted to synthesize spherical MnCO3, then it was mixed uniformly with Li2CO3 in agate mortar, followed by calcinations at 600 degrees C and 800 degrees C for 10 and 24 h respectively, and as a result the spherical or sphere-like spinel LiMn2O4 Was formed. The electrochemical performances of LiMn2O4 prepared by normal solid-state reaction and controlled crystallization method respectively were compared. It showed that the stoichiometric spherical LiMn2O4 had obviously excellent electrochemical performance, whose initial reversible capacity was 129.40 mAh/g with the high capacity retention of 95.28% after 100 cycles, than those of the polyhedral LiMn2O4 synthesized by the solid-state reaction, whose initial reversible capacity was 129.12 mAh/g with the capacity retention of 77.38% after 100 cycles. (C) 2008 Elsevier B.V. All rights reserved.