过渡金属铁酸盐纳米球的电化学性能  

Electrochemical properties of transition metal ferrite nanospheres

作　　者：冯慧芬[1] 卢周广[1,2] 杨幼平[1] 古映莹[1] 胡菁[1] 周科朝[2] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2014年第5期1411-1419,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(21001117);中国博士后科学基金资助项目(2011M501286);中南大学大学生创新创业启航行动项目(2011-24)

摘　　要：采用溶剂热法制备系列过渡金属铁酸盐复合氧化物MFe2O4（M=Fe,Zn,Co,Mg）纳米球,用XRD,SEM,Raman以及充放电测试等方法对其结构、形貌、碳包覆效果以及电化学性能进行表征。为了提高铁酸盐的循环性能,对ZnFe2O4和CoFe2O4进行碳包覆。研究结果表明：制备的纳米球为尖晶石结构,其粒径为350~500 nm。充放电曲线较为平缓,充放电平台较长。与其他几种铁氧体相比,MgFe2O4具有最高的可逆比容量（950 mA·h/g,0.05C）,最高的首次库仑效率（73.1%）和最好的循环稳定性以及高倍率性能。碳包覆以后电极材料的比容量及容量保持率都有很大的提高,有望作为锂离子电池的新型负极材料。Transition metal ferrite MFe2O4（M=Fe, Zn, Co, Mg） nanospheres were prepared in a solvothermal process. The structure, morphology, effect of carbon-coated and electrochemical properties of the samples were investigated by XRD, SEM, Raman and discharge-charge cycle. In order to improve cycling performance of the transition metal ferrite, ZnFe2O4 and CoFe2O4 were coated with conductive carbon. The results show that the particle sizes of the prepared spinel nanospheres are in the range of 350-500 nm. The discharge-charge curves are relatively flat and the charge-discharge platforms are longer. Among the MFe2O4（M=Fe, Zn, Co, Mg） nanospheres, the MgFe2O4 demonstrates relatively the highest reversible capacity with a value of 950 mA·h/g, the highest columbic efficiency（73.1%）, and the best cycling stability and high rate capability at the current density of 0.05C. The capacity and capacity retention of the carbon-coated electrode materials are greatly improved, indicating their promising application as anode materials for Li-ion batteries.

关 键 词：锂离子电池 负极材料 纳米球 铁酸盐 复合氧化物 溶剂热 

分 类 号：TQ174[化学工程—陶瓷工业]