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镁掺杂对锰酸锂结构和性能的影响
引用本文:付春明,叶学海,张晓波,于晓微,夏继平. 镁掺杂对锰酸锂结构和性能的影响[J]. 无机盐工业, 2013, 45(12): 57-59
作者姓名:付春明  叶学海  张晓波  于晓微  夏继平
作者单位:中海油天津化工研究设计院,天津 300131
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LiMgxMn2-xO4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%。

关 键 词:锰酸锂    掺杂  电化学性能  

Effects of Mg doping on structure and performance of lithium manganate
Fu Chunming;Ye Xuehai;Zhang Xiaobo;Yu Xiaowei;Xia Jiping. Effects of Mg doping on structure and performance of lithium manganate[J]. Inorganic Chemicals Industry, 2013, 45(12): 57-59
Authors:Fu Chunming  Ye Xuehai  Zhang Xiaobo  Yu Xiaowei  Xia Jiping
Affiliation:CNOOC Tianjin Chemical Research & Design Institute,Tianjin 300131,China
Abstract: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 spinelstructure without impurity phase.The Scanning electron microscopy(SEM) results showed that the size and morphologyof all the samples before and after doping made little difference.The results of charge-discharge test showed that the samplehad 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 ℃.
Keywords:lithium manganate  magnesium  doping  electrochemical properties  
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