摘要
研究了以氢氧化锂和醋酸锰为原料 ,用溶胶—凝胶法制备作为锂离子二次电池的正极材料的Liy Crx Mn2 -x O4 ( x=0 .0 5,0 .0 8,0 .1 2 ;y=1 .0 0 ,1 .0 5,1 .1 0 )。用 X射线衍射法对样品进行分析 ,证实其结构仍然是尖晶石结构。实验结果显示 ,对于尖晶石 Li1.0 5Cr0 .0 5Mn1.95O4 的最佳热合成温度是750℃ ,而合成 Liy Crx Mn2 -x O4 样品的晶体学参数和电化学性能在很大程度上受锂和铬的含量的影响。综合考虑循环寿命和容量密度 ,Li1.0 5Cr0 .0 5Mn1.95O4 的性能最好。循环性能的改善主要是因为掺杂后结构更稳定。
Li yCr xMn 2-x O 4(x=0 05,0 08,0 12;y=1 00,1 05,1 10)samples were prepared by sol—gel reaction from LiOH and Mn(CH 3COO) 2·4H 2O X—ray diffraction patterns of the prepared samples are identified as the spinel structure. The results indicated that the optimum sintering temperature in air was 750℃ The crystallographic parameter and electrochemical performance of the Li yCr xMn 2-x O 4 are influenced by the amount of lithium and chrome. Considering both cycle life and capacity density, Li 1 05 Cr 0 05 Mn 1 95 O 4 showed good performance. The improvement in cycling performance is attributed to the stabilization in the spinel structure.
出处
《湖南冶金》
2001年第2期8-11,共4页
Hunan Metallurgy
基金
高等学校骨干教师基金!资助
湖南省自然科学基金!资助项目 ( 99JJY2 0 0 4 7)
