应用化学2017，Vol.34Issue(6)：712-722,11.DOI:10.11944/j.issn.1000-0518.2017.06.160357
磷酸钒锂/石墨烯复合正极材料的制备及表征
Synthesis and Properties of Lithium Vanadium Phosphates/Reduced Graphene Oxide Composite as Cathode Materials
摘要
Abstract
Lithium vanadium phosphate(Li3V2(PO4)3)/reduced graphene oxide(rGO) composite has been successfully synthesized by incorporating melamine resin(MR) functionalized GO precursor into the Li3V2(PO4)3 solution and the subsequent heat treatment.The structural and electrochemical properties of Li3V2(PO4)3/rGO were characterized.The results show that Li3V2(PO4)3/rGO composite has monoclinic system, restacking of graphene layers and agglomeration of Li3V2(PO4)3 particles have been greatly inhibited, electrochemical performance of the composite has been improved.The as-obtained Li3V2(PO4)3/rGO was used as the cathode material in lithium ion batteries.The very low degree of polarization in the curve shows that electron and ion transports are facile, thus good rate and cycle behavior are observed.A considerably high lithiation capacity of 86 mA·h/g can be retained even at 20 C in the range of 3.0~4.3 V.After 100 cycles at 0.1 C, a discharge capacity of 119.7 mA·h/g could be delivered with the capacity retention of 94%.When the cells are operated between the voltage limits of 3.0~4.8 V vs.Li+/Li, a lithiation capacity of 80 mA·h/g at 10 C and 145.6 mA·h/g at 0.1 C after 100 cycles could be retained.Good cycling and rate performances, together with low carbon content, will be satisfactory for use as cathode material in lithium ion batteries.关键词
磷酸钒锂/石墨烯/电极材料/电化学性能Key words
lithium vanadium phosphate/graphene/electrode material/electrochemical performance分类
化学化工引用本文复制引用
焦连升,孟玲菊,吴同舜,李风华,牛利..磷酸钒锂/石墨烯复合正极材料的制备及表征[J].应用化学,2017,34(6):712-722,11.基金项目
国家自然科学基金委杰出青年基金项目(21225524)资助 （21225524）
国家自然科学基金委重大科研仪器设备研制专项(21527806)资助 （21527806）
泰山学者建设工程专项经费资助(ts201511058) （ts201511058）
Supported by the National Science Fund for Distinguished Young Scholars NSFC(No.21225524), Fund for Major Research Instruments and Equipment Development NSFC(No.215278106), the Taishan Scholar Project(No.ts201511058). （No.21225524）
