CoMoO_4/rGO复合材料的制备及储锂性能研究  

Synthesis of CoMoO_4/rGO Composite and Its Lithium Storage Performance Research

作　　者：常晓璇 李容[1] 张文丽[1] 苟兴龙[1] 

机构地区：[1]西华师范大学化学化工学院,四川南充637000

出　　处：《长江大学学报（自科版）（上旬）》2016年第3期17-21,3-4,共5页JOURNAL OF YANGTZE UNIVERSITY (NATURAL SCIENCE EDITION) SCI ＆ ENG

基　　金：国家自然科学基金项目(21571148);教育部新世纪优秀人才计划(NCET-10-0890)

摘　　要：通过水热和煅烧合成出CoMoO_4微米棒,在其表面包覆氧化石墨烯(GO),经过一步热还原,得到了CoMoO_4/rGO复合材料,并对其形貌和结构进行表征。XRD显示所合成的物质为CoMoO_4,从SEM图可以看出CoMoO_4微米棒很好的被rGO所包覆,由TG曲线可以看出CoMoO_4/rGO复合材料中rGO的含量为26.6%。将CoMoO_4/rGO复合材料作为锂离子电池负极进行了电化学测试,测试结果表明:在200mA/g电流密度下循环200次后,容量可以达到1166mA·h/g;即使在2000mA/g电流密度下,容量仍然可以保持在503mA·h/g;当电流密度重新回到200mA/g时,容量可以恢复到1198mA·h/g,显示出了较好的循环和倍率性能,有望用于下一代可充电锂离子电池负极材料。After being hydrothermaled and calcined,the CoMoO_4 microrods is prepared.Then graphene oxide(GO)is coated on the surface,and it is processed by thermal reduction,the CoMoO_4/rGO composite is obtained and its morphology and structure are characterized.XRD patterns show that the synthetic material is CoMoO_4,it can be seeing from the SEM image that the CoMoO_4 microrods i well coated by rGO,through TG curve the rGO content in the Co-MoO_4/rGO composite is 26.6%.When the CoMoO_4/rGO composite is used as an anode materials for lithium ion batteries constant current charge-discharge tests show that the CoMoO_4/rGO can deliver a reversible capacity of 1166mA·h/g after 200 cycles at a current density of 200mA/g,in rate capacity test,a reversible capacity of 503mA·h/g is retained even at a current density of 2000mA/g;when the current density goes back to 200mA/g,its capacity could be recovered to 1198mA·h/g,which show a preferably cyclicity and rate performance.It can be hopefully used as negative electrode material of lithium ion batteries.

关 键 词：CoMoO4 GO 微米棒 复合材料 锂离子电池 负极 

分 类 号：O646[理学—物理化学]