镁掺杂对锰酸锂结构和性能的影响  

Effects of Mg doping on structure and performance of lithium manganate

作　　者：付春明[1] 叶学海[1] 张晓波[1] 于晓微[1] 夏继平[1] 

机构地区：[1]中海油天津化工研究设计院,天津300131

出　　处：《无机盐工业》2013年第12期57-59,共3页Inorganic Chemicals Industry

摘　　要：采用高温固相法合成不同镁元素掺杂量的尖晶石型锰酸锂。X射线衍射(XRD)表征结果表明,样品都具有尖晶石结构,无杂质相。扫描电镜(SEM)表征结果显示,掺杂前后所有样品的颗粒大小和形貌差别不大。对样品进行电化学性能测试,结果表明:当LiMg x Mn2-x O4中镁的掺杂量x=0.09时,样品具有较佳的电化学性能,首次放电比容量为110.5 mA·h/g,在55℃1 C充放电循环50次后容量保持率为91.22%。Spinel lithium manganate samples modified with different proportions of magnesium element were prepared by high temperature solid state reaction.The X-ray diffraction（XRD） analysis indicated that the samples were all spinel structure without impurity phase.The Scanning electron microscopy （SEM） results showed that the size and morphology of all the samples before and after doping made little difference.The results of charge-discharge test showed that the sample had better electrochemical properties when x=0.09 in LiMgxMn2-xO4 .The initial discharge specific capacity was 110.5 mA .h/g, and the specific capacity retention was 91.22% after 50 cycles at 1C rate and 55℃.

关 键 词：锰酸锂 镁 掺杂 电化学性能 

分 类 号：TQ131.11[化学工程—无机化工]