以Mn_3O_4为前驱体制备尖晶石型LiMn_2O_4及其性能  

Preparation process and performance of spinel LiMn_2O_4 using Mn_3O_4 as precursor

作　　者：王英平[1] 王先友[1] 隗小山 魏启亮[1] 杨秀康[1] 杨顺毅[1] 舒洪波[1] 白艳松[1] 吴强[1] 

机构地区：[1]湘潭大学化学学院环境友好化学与应用教育部重点实验室,湘潭411105 [2]湖南石油化工职业技术学院,岳阳414012

出　　处：《中国有色金属学报》2012年第8期2276-2282,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(20871101);科技部科技计划项目(2009GJD20021);湖南省科技厅计划项目(2010WK4007);湖南省科技计划项目(2010TC2004);湖南省自然科学市州联合基金重点资助项目(09JJ8001)

摘　　要：采用改进的固相反应法合成了高性能的锂离子电池正极材料LiMn2O4。首先,以廉价的MnSO4为原料,通过水解氧化法制备纳米级Mn3O4前驱体;然后,将Mn3O4和Li2CO3混合均匀,在750℃固相反应20 h,得到尖晶石型LiMn2O4。用X射线衍射（XRD）和扫描电镜（SEM）对Mn3O4前驱体和LiMn2O4样品进行表征,用充放电测试和循环伏安技术对LiMn2O4样品进行电化学性能研究。结果表明：所制备的LiMn2O4具有完整的尖晶石型结构,且晶体粒子分布均匀。所制备的LiMn2O4材料在3.0~4.4 V之间,室温（25℃）下,在0.2C倍率下首次放电比容量为130.6 mA.h/g;在0.5C倍率下首次放电比容量为127.1 mA.h/g,30次循环后,容量仍有109.5 mA.h/g,且样品具有较好的高温性能。LiMn2O4 with high-performance for the application of lithium-ion batteries was successfully synthesized by a modified solid phase reaction route. First, the precursor Mn3O4 was prepared by a hydrolyzation -oxidation method using cheap MnSO4 as Mn source. Then, the as-prepared precursor Mn3O4 and Li2CO3 were mixed homogeneously and calcined at 750 ℃ for 20 h to obtain spinel LiMn2O4. The properties of samples were characterized by XRD and SEM, charge-discharge tests and cyclic voltammetry. The results show that the as-prepared LiMn2O4 has spine structure and exhibits uniform particle size distribution. The initial discharge capacities of the as-prepared LiMnEO4 are as high as 130.9 mA.h/g at 0.2C and 127.1 mA.h/g at 0.5C in the voltage range of 3.0-4.4 V at 25 ℃, especially, the discharge capacity at 30th cycle still keep to be 109.5 mA.h/g at 0.5C. Besides, the as-prepared LiMn2O4 presents good high temperature performance.

关 键 词：锂离子电池 正极材料 尖晶石LIMN2O4 水解氧化法 Mn3O4前驱体 

分 类 号：TM912[电气工程—电力电子与电力传动]