Co3V2O8/石墨烯复合负极材料的合成及其储锂性能  

Preparation and Electrochemical Properties of Co3V2O8/graphene Composite of Anode Material for Lithium Storage

作　　者：郑浩[1] 金佳幸 程劲松[1] 赵荣飞[1] 李琳[1,2] ZHENG Hao;JIN Jia-Xin;CHENG Jing-Song;ZHAO Rong-Fei;LI Lin(Key Laboratory of Functional Materials and Chemistry for Performance and Resource of Guizhou Education Department,Anshun University,Anshun,Guizhou 561000,China;School of Chemical Engineering,Guizhou University of Engineering Science,Bijie,Guizhou 551700,China)

机构地区：[1]安顺学院功能材料与资源化学重点实验室,安顺561000 [2]贵州工程应用技术学院化学工程学院,毕节551700

出　　处：《无机化学学报》2020年第1期62-68,共7页Chinese Journal of Inorganic Chemistry

基　　金：贵州省教育厅创新群体重大研究项目(No.黔教合KY字[2018]031)资助

摘　　要：以石墨烯为基底,CoCl2·2H2O和NH4VO3为原料,采用水热结合热处理方法合成了Co3V2O8/石墨烯复合电极材料;采用XRD、Raman、XPS、SEM、(HR-)TEM和恒电流充放电等对材料进行了结构表征与电化学性能测试。结果表明:Co3V2O8/rGO复合材料表现出优异的放电比容量、优秀的倍率性能和稳定的循环性能(当电流密度为200 mA·g^-1,经过100次循环后,可逆放电比容量为1208 mAh·g^-1);Co3V2O8/rGO电极材料表现出优异的倍率和循环性能可以归因于:独特的石墨烯包覆结构可以有效地提高材料的导电性和增强结构的稳定性、缓解Co3V2O8粒子在循环过程中的聚结和膨胀现象;此外,Co3V2O8纳米颗粒均匀地嵌在石墨烯层间防止了石墨烯片层间的堆叠。We demonstrated the preparation of graphene oxide(GO)decorated Co3V2O8 to form(Co3V2O8/rGO)composite through a facile approach combining hydrothermal synthesis with thermal reduction.The XRD,Raman,XPS,SEM,(HR-)TEM,and electrochemical performance tests were used to study the relationship between the physical character and the electrochemical properties of the electrode material.As the anode material,the Co3V2O8/rGO delivered excellent lithium storage properties,stable cycle performance,and high rate capability(1208 mAh·g^-1 at 200 mA·g^-1 after 100 cycles).It is demonstrated that an enhanced cycle performance can be acquired because graphene can accelerate the electron diffusion among the Co3V2O8 active particles,prevent the aggregation of Co3V2O8 particles,and effectively accommodate the volume variation during the discharge/charge process and offer short pathways for the ions as well as electrons.Meanwhile,the incorporation of the Co3V2O8 particles suppress the stack of graphene layer.

关 键 词：Co3V2O8 石墨烯 复合材料 负极材料 锂离子电池 

分 类 号：O614[理学—无机化学] TB333[理学—化学]