锰酸锂合成的动力学研究(Ⅰ)──氧气气氛  

Dynamic Study of Spinel LiMn_2O_4 Synthesis at Oxygen Atmosphere

作　　者：张国范[1] 赵铭姝[1] 翟玉春[1] 田彦文[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2001年第4期439-442,共4页Journal of Northeastern University(Natural Science)

基　　金：辽宁省自然科学基金资助项目 ( 9810 30 0 70 2 )

摘　　要：用热分析仪测试不同升温速率下 ,氢氧化锂和二氧化锰在氧气气氛中的差热分析曲线 ,结合Doyle Ozawa法和Kissinger法研究锰酸锂合成的动力学 ;计算各反应阶段的表观活化能 ,依次为 5 9 462kJ·mol-1,92 672kJ·mol-1,1 63 2 71kJ·mol-1和 1 0 7 5 2 4kJ·mol-1·并确定反应级数 ,频率因子 ,速率常数 ,推导出每个反应阶段的动力学方程·为制备尖晶石型锰酸锂提供理论依据 ,进一步优化工艺条件·The differential thermal analyses curves were measured at different heating rates in oxygen atmosphere for synthesis of LiMn 2O 4 with LiOH·H 2O and MnO 2. The kinetics of each reaction processes were studied with both methods of Doyle Ozawa and Kissinger. The reaction active energies for each reaction stage were obtained. They are: 59 462?kJ·mol -1 , 92 672?kJ·mol -1 , 163 271?kJ·mol -1 and 107 524?kJ·mol -1 respectively. The coefficients of reaction order and frequency factor were also determined, and kinetic equations of each reaction were established as well. The research can be considered as a theoretical base for preparing spinel LiMn 2O 4, and optimizing processing conditions further.

关 键 词：锰酸锂 氧气气氛 合成 动力学 锂离子电池 

分 类 号：TM911.4[电气工程—电力电子与电力传动]