Co_2SnO_4/Graphene复合材料的制备与电化学性能研究  

Preparation and electrochemical properties of Co_2SnO_4/graphene composites

作　　者：陈畅[1,2] 汝强[1,2] 胡社军[1,2] 安柏楠 宋雄[1,2] 

机构地区：[1]广东省量子调控工程与材料重点实验室,华南师范大学物理与电信工程学院,广州510006 [2]电化学储能材料与技术教育部工程研究中心,广州510006

出　　处：《物理学报》2014年第19期350-357,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51101062;51171065);广州市科技计划项目(批准号:2011J4100075);广东高校优秀青年创新人才培育项目(批准号:LYM09052);广东省自然科学基金重点项目(批准号:S2012020010937;10351063101000001);华南师范大学研究生科研创新基金(批准号:2013KYJJ039)资助的课题~~

摘　　要：实验首先采用改进的Hummers法制备氧化石墨,然后以氧化石墨烯为前驱体,通过水热法将锡酸钴纳米颗粒均匀镶嵌在石墨烯薄膜基片上,最终获得Co2SnO4/Graphene镶嵌复合材料.采用X射线衍射(XRD)、扫描电子显微镜(SEM)对材料的结构和形貌进行表征,通过恒电流充放电(CC)、循环伏安法(CV)与交流阻抗法(EIS)测试了材料的电化学性能.实验结果表明,石墨烯良好的分散性及较高的电子导电率,可以提高锡酸钴材料的电化学性能,材料首次可逆容量达到1415.2 mA·h/g,50次循环后仍能保持469.7 mA·h/g的放电比容量.Co2SnO4/graphene composite has been prepared by multi-step synthetic process. Firstly, the formation of Co2SnO4 and the reduction of graphene oxide（GO） occur simultaneously during the hydrothermal process and the Co2SnO4 particles are uniformly embedded in the film-like graphene to form a mosaic structure. To characterize the phase and morphology of the composite material, X-ray diffraction（XRD）, scanning electron microscope（SEM） are used. The constant current charge and discharge（CC）, cyclic voltammetry（CV） and electrochemical impedance spectroscopy（EIS）are also used to test the electrochemical performance of Co2SnO4/graphene composite. Results show that graphene can effectively improve the electrochemical performance of Co2SnO4/graphene composite by its good dispersibility and high electrical conductivity. The composite material exhibits a first discharge specific capacity of 1415.2 mA·h/g with the specific capacity still higher than 469.7 mA·h/g after 50 cycles.

关 键 词：Co2SnO4 石墨烯 电化学性能 锂离子电池 

分 类 号：TB332[一般工业技术—材料科学与工程]