正尖晶石型LiMn_2O_4的制备及性能  

Preparation and Property of Normal Spinel LiMn_2O_4

作　　者：袁文辉[1] 王婵月[1] 李莉[2] 

机构地区：[1]华南理工大学广东省绿色化学品重点实验室,广东广州510640 [2]华南理工大学环境科学与工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2007年第6期81-85,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省自然科学基金资助项目(04020126)

摘　　要：采用乙二胺四乙酸-柠檬酸(EDTA-CA)络合法,以硝酸锂、硝酸锰为原料制备了正尖晶石型LiMn2O4超细粉末晶体,采用FTIR、TG-DSC、XRD、SEM、TEM和BET等手段对LiMn2O4的前驱体及LiMn2O4粉末进行了表征.结果表明:当Li/Mn摩尔比为0.6、(Mn+Li)/(EDTA+CA)摩尔比为0.5时,在600℃下煅烧4 h,制备出的LiMn2O4粉末为正尖晶石型,其BET比表面积为7.994 8m2/g,粒径小至40 nm,有轻微团聚.LiMn2O4脱嵌后对Li+的最大吸附容量达5.3mmol/g.Super-fine powders of normal spinel LiMn2O4 were synthesized by means of EDTA-citric acid （EDTA- CA） chelating method, with the nitrates of lithium and manganese as the starting materials. The precursor of LiMn2O4 and the synthesized LiMn2O4 powders were then characterized by FTIR, TG-DSC, XRD, SEM, TEM and BET mea-surements. The results show that, when values of nLi： nMn and nMn＋Li： nEDTA＋CA are respectively 0. 6 and 1： 2, normal spinel LiMn2O4 with slight agglomeration can be synthesized after a calcination for 4 h at 600℃, and the BET specific surface area is 7. 9948 m^2/g with diameter being as small as 40 nm. It is also found that the largest lithium adsorption capacity of the leached LiMn2O4 reaches up to 5.3 mmol/g.

关 键 词：Λ-MNO2 LIMN2O4 络合 吸附容量 

分 类 号：TQ131.11[化学工程—无机化工]