RGO-InVO_4纳米复合材料的制备及作为锂离子电池负极材料的应用  

Preparation of RGO-InVO_4 Nanocomposite as Anode Materials for Lithium Ion Batteries

作　　者：罗冬明[1] 刘金龙[1] 王群峰[1] 袁惠敏[1] 钱东[1] 

机构地区：[1]中南大学化学化工学院,中国长沙410083

出　　处：《湖南师范大学自然科学学报》2013年第4期43-48,共6页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金资助项目(21171174)

摘　　要：采用改进的Hummers法合成了氧化石墨(GO),再通过水热法合成了还原氧化石墨(RGO)-InVO4纳米复合材料.采用X射线衍射(XRD)、透射电镜(TEM)和高分辨透射电镜(HRTEM)等手段对样品的组成和形貌进行了表征.分别考察了RGO-InVO4和InVO4作为锂离子电池负极材料在不同电流密度下的充放电和循环稳定性能.结果表明:RGO-InVO4电极的首次放电和充电比容量分别为1 047.5和599 mAh·g-1,而InVO4电极的首次放电和充电比容量分别为994.2和482 mAh·g-1;在不同电流密度下经过50次循环后,RGO-InVO4的放电和充电比容量分别为472.4和456.7 mAh·g-1,而InVO4的放电和充电比容量则分别为138.4和132.9 mAh·g-1.可见,RGO的引入能极大地改善InVO4的电化学性能,尤其是循环稳定性.Graphite oxide （GO） was synthesized by the modified Hummers method, followed by a hydrothermal route to form reduced graphite oxide （RGO）InVO4 nanocomposite, of which composition and morphology were characterized by Xray diffraction （XRD）, transmission electron microscope （TEM） and high resolution transmission electron microscope （HRTEM）. Chargedischarge properties and cyclic stability of RGO-InVO4 and InVO4 as anode materials for lithium batteries were tested under different current densities, respectively. The results show that the first discharge and charge specific capacities of the RGO-InVO4 electrode are 1 047.5 and 599 mAh·g^-1, while the first discharge and charge specific capacities of the InVO4 electrode are 994.2 and 482 mAh·g^-1, respectively. After 50 cycles under different current densities, the discharge and charge specific capacities of the RGO-InVO4 electrode are 472.4 and 456.7 mAh·g^-1, while the InVO4 electrode are 138.4 and 132.9 mAh·g^-1, respectively. The introduction of RGO can pronouncedly improve the electrochemical properties of InVO4, especially for cyclic stability.

关 键 词：RGO—InVO4纳米复合材料 锂离子电池 负极材料 放电比容量 

分 类 号：TQ152[化学工程—电化学工业]