锂离子电池正极材料锰钴酸锂的表征与分解动力学  

Synthesizing kinetics and characteristics of LiMnCoO_4 using as lithium-ion battery cathode material

作　　者：赵铭姝[1] 汪飞[1] 宋晓平[1] 

机构地区：[1]西安交通大学理学院,西安710049

出　　处：《中国有色金属学报》2005年第9期1396-1402,共7页The Chinese Journal of Nonferrous Metals

基　　金：西安交通大学引进人才基金资助项目(090071181)

摘　　要：结合不同升温速率的差热分析,研究了氧气气氛中锰钴酸锂分解的反应动力学。利用Doyle-Ozawa法和Kissinger法计算各反应阶段的表观活化能,分别为93.905,138.012,158.148和891.496 kJ/mol。用Kissinger法确定了每个反应阶段的反应级数、频率因子和动力学方程。X射线衍射、场发射电镜、透射电镜以及电化学检测表明,采用固相分段法制备的LiMn2O4型正极材料晶粒分布均匀,形貌规整,晶型发育完善,电化学性能良好。从结构化学的角度探讨了添加的钴元素对纯相LiMn2O4的Jahn-Teller效应的影响。The discomposing kinetics of lithium manganese cobalt oxides in dynamical oxygen atmosphere was studied by means of differential temperature analysis （DTA） with different heating rates, and it could be applied as an important theoretical principle for preparing LiMn2O4 derivants. The active energies of four reaction process are 93. 905, 138. 012, 158. 148 and 891. 496 kJ/mol, respectively. Reaction orders, frequency factors and kinetic equations of each reaction were determined by using Kissinger method. X-ray diffractrometry, field emission microscopy, transmitting electron microscopy, and electrochemistry analysis show that the LiMnCoO4 synthesized with solidstep-sintering method has a pure phase, well-distributed particle, regular appearance and good electro-chemistry properties. The influence of element of cobalt on Jahn-Teller of LiMn2O4 was discussed in the viewpoint of structural chemistry.

关 键 词：锂离子电池 锰钴酸锂 合成动力学 微观表征 分解动力学 正极材料 钴酸锂 锂离子电池 Kissinger法 JAHN-TELLER效应 反应动力学 LiMn2O4 表征 

分 类 号：O631.22[理学—高分子化学] TM912.2[理学—化学]