水热法合成高容量的纳米级锂离子电池负极材料钴酸盐  

Synthesis of Nano-Size Cobaltite as a High Performance Anode Material for Lithium-Ion Batteries via Hydrothermal Route

作　　者：刘浩文[1] 汪晋[1] 

机构地区：[1]中南民族大学化学与材料科学学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2011年第4期11-15,共5页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：中南民族大学中央高校基本科研业务费专项资金(CZZ10002)

摘　　要：采用水热法制备出了3种不同的纳米级钴酸盐MCo2O4(M=Mn,Zn,Cu).产物的晶型、形貌分别通过X-射线粉末衍射(XRD)和透射电子显微镜(TEM)进行表征.XRD结果表明,3种钴酸盐均属立方晶系,具有尖晶石结构;TEM结果表明3,种钴酸盐均为纳米级颗粒,粒径分别为11～17、16～23和22～26 nm.将其作为锂离子电池负极材料进行了恒电流测试,其初始放电容量分别高达1448、1534和1509 mA.h.g-1.利用循环伏安法对其反应机理做了初步的探讨.充放电结果说明水热法合成出的纳米级钴酸盐有望成为锂离子电池负极材料.Three different kinds of MCo2 O4 （ M = Mn, Zn, Cu） were obtained via hydrothermal route. The crystalline phases and the morphology of the prepared samples were characterized by X-ray diffraction （ XRD ） and transmission electron microscopy （TEM）, respectively. XRD figures showed that the obtained samples have spinel structure. The particles sizes of the resulting samples were in the range of 11-17, 16-23 and 22-26 nm. The electrochemical performance of MCo2 O4 （M = Mn, Zn, Cu） as the anod for lithium ion batteries was tested. It shows that the first discharge capacities of the batteries can reach a very high value of 1448, 1534 and 1509 mA · h · g-1, respectively. The reaction mechanism between lithium and cobaltite was also discussed based on the results of cyclic vohammograms. All the results reveal that the nano-cobaltite particles obtained from the hydrothermal method are expected to be a promising anode material for applications in lithium ion batteries.

关 键 词：锂离子电池 负极材料 水热法 钴酸盐 

分 类 号：O657.63[理学—分析化学]