锂和钴元素掺杂对锂锰尖晶石结构和性能的影响  

Effect of lithium and cobalt doping on the Li-Mn spinel structure and performance

作　　者：杜荣斌[1] 刘峥[1] 

机构地区：[1]桂林工学院有色金属材料及其加工新技术省部共建教育部重点实验室,广西桂林541004

出　　处：《电源技术》2006年第9期736-739,共4页Chinese Journal of Power Sources

基　　金：广西自然科学基金项目(0342037)

摘　　要：利用流变相反应法合成了两种化合物LixMn2O4(0.90≤x≤1.2)和LiMn2-xCoxO4(0.05≤x≤0.5),探讨了不同锂含量对尖晶石材料结构和性能的影响,并对掺钴材料LiMn2-xCoxO4的结构和电化学性能作了初步研究。不同Li/2Mn对合成的尖晶石LiMn2O4的结构有很大的影响,对于纯的尖晶石LiMn2O4化合物,其Li/2Mn值应控制在0.95￣1.15之间。Co3+离子掺入到LiMn2O4能稳定尖晶石的骨架结构,并且极大地改善了LiMn2O4在充放电过程中的循环稳定性能。Two compounds of LixMn2O4 （ 0.90 ≤x ≤ 1.2 ）and LiMn2-xCoxO4 （0.05 ≤x ≤0.5） were synthesized by rheological phase reaction, and the effect of different lithium content on spinel structure and performance were discussed. The structure and electrochemical properties of cobalt doped LiMn2-xCOxO4 were studied. Different ratios of Li/2Mn greatly impacted on the structure of synthesized spinel LiMn2O4, as for pure LiMn2O4, its ratio of Li/2Mn should be controlled between 0.95-1.15. Co^3＋ doping into LiMn204 can stabilize the spinel framework, and improve the cyclic stability of LiMn2O4 during the charge-discharge process.

关 键 词：尖晶石结构 流变相反应 掺杂 循环性能 

分 类 号：O646.54[理学—物理化学] TM912.9[理学—化学]