锰基锂正极半导体材料禁带特性研究  

Study on the band gap character of Mn-base lithium anode material

作　　者：吴汉杰 梁兴华[1] 黄美红[1] 宋清清 刘浩[1] 

机构地区：[1]广西汽车零部件与整车技术重点实验室(广西科技大学),广西柳州545006

出　　处：《广西科技大学学报》2015年第3期69-72,77,共5页Journal of Guangxi University of Science and Technology

基　　金：广西重点实验室建设项目(13-051-38);广西重点实验室开发基金项目(2012KFMS04);广西车辆动力与新能源研发中心建设项目(2013KFMS01)资助

摘　　要：采用高温合成法对掺杂Ni和Fe固体物质锰基锂正极材料进行研究,制备出锰基锂正极半导体材料Li Ni0.5Mn1.5O4,Li Ni0.5Mn1.5Fe0.1O4和Li Ni0.5Mn1.5Fe0.2O4,利用X射线衍射仪分析该产物的晶体结构,运用紫外可见光纤光谱仪测试该材料的光谱特征,采用高精度电池测试仪测试半电池的充放电特性.测试结果表明:锰基锂正极半导体材料为立方尖晶石结构,其晶体结构是立方晶系,Fd3m空间群.Li Ni0.5Mn1.5O4,Li Ni0.5Mn1.5Fe0.1O4和Li Ni0.5Mn1.5Fe0.2O4的紫外可见光吸收系数分别处于0.830,0.839和0.857时,禁带宽度分别为0.989 e V,0.966 e V和0.922 e V.半电池电特性测试表明:充放电电压范围处于3.45 V^4.8 V区间,充放电出现了2个平台.For doping Ni and Fe solid material, studying on Mn-base lithium anode material by using high temperature synthesis method, the preparation of the Mn-Base lithium anode semiconductor material LiNi0.5Mn1.5O4,LiNi0.5Mn1.5Fe0.1O4 and LiNi0.5Mn1.5Fe0.2O4. The crystal structure of the sample was analyzed and collected through X- ray diffraetometry （XRD）, It also tested spectrum features of the material by using ultraviolet visible spectrophotometer, The character of charge-discharge were showed by high precision electrical tester. Testing results showed that Mn-base lithium anode semiconducting material was diamond structure, crystal structure was space group of Fd3m and the cubic crystal system. When absorption coefficient of ultraviolet visible light of LiNi0.5Mn1.5O4,LiNi0.5Mn1.5Fe0.1O4 and LiNi0.5Mn1.5Fe0.2O4 were respectively 0.830, 0.839 and 0.857, the width of the band gap were respectively 2.24e V, 2.22eV, 1.85eV. Electrical characteristics tests indicated that there were two charge - discharge platforms and between 3.45 V and 4.8 V in the semi-finished products of the battery.

关 键 词：锰基锂 正极材料 禁带特性 

分 类 号：TM911[电气工程—电力电子与电力传动]