亚微米级LiAl_xMn^(2-x)O_4的制备及其性能研究  

Preparing and electrochemical properties of the submicron LiAl_xMn^(2-x)O_4

作　　者：李胜军 陈猛[1] 杨世伟 陈增 王锦富[1] 杨闯[1] 

机构地区：[1]哈尔滨工程大学材料化学与化学工程学院,哈尔滨150001

出　　处：《黑龙江大学自然科学学报》2007年第5期648-650,657,共4页Journal of Natural Science of Heilongjiang University

摘　　要：以硝酸锂、醋酸锰及廉价的尿素为材料,用燃烧法合成尖晶石型LiMn2O4,XRD研究发现,利用燃烧法制备的前驱体已经具有一定的尖晶石结构,但存在一些杂质峰,煅烧后得到纯净的尖晶石LiAlxMn2-xO4材料,其粒径较小,约为0.5μm,且颗粒分布均匀。在圆柱形实体电池体系中研究了材料的电化学性能。材料的首次放电容量达到了102.42 mA.h.g-1,对材料进行微量Al3+掺杂后,材料的循环性能得到显著提高,经过40次循环后,材料的容量保持率为83.3%。The submicron spinel LiMn2O4 was made by combustion method from LiNO3 , Mn （ CH3 COOH） 2·4H2O and cheap H2NCONH2. XRD pattern showed that the precursor already had spinel structure. But after the sintering, the LiAlxMn2-xO4 had pure spinel structure. The particle size was about 0. 5 μm and distributed evenly. The electrochemical properties of the cathode material was studied in cylindrical lithium ion battery. The initial discharge capacity was 102.42 mA·h·g^-1. After doped by Al^3＋ , the cycle capacity was highly improved and the initial discharge capacity had little decrease. The test battery could remain 83.3% of the discharge capacity after 40 cycles.

关 键 词：锂离子电池 尖晶石LIMN2O4 燃烧法 

分 类 号：TM914.42[电气工程—电力电子与电力传动]