材料期刊网

The spinel compound LiCr(0.1)Ni(0.4)Mn(1.5)O(4) is synthesized by a sol-gel method In this synthesizing process, Li(CH(3)COO)2H(2)O, Ni(CH(3)COO)(2) 4H(2)O, Mn(CH(3)COO)(2) 4H(2)O and Cr(NO(3))(3) 9H(2)O are used as reactants, and malic acid as chelating agent The reaction takes place at 900 degrees C for 8 h. The electrochemical performances of the as-prepared sample are measured at different current rates In the range of 3.5-5.0 V, its discharge capacities are 141, 125 and 95 mAh g(-1) at 0.5, 1 and 5C, respectively. Based on cycle voltammerry results, the diffusion coefficient of Li(+) is calculated as 6.75 x 10(-10) cm(2) s(-1) at 407 V in oxidation process. (C) 2010 Elsevier B V. All rights reserved