五氧化二钒纳米颗粒的制备及其电化学性能研究  

Preparation and electrochemical performance of V_2O_5 nanoparticles

作　　者：孟琳[1] 翟晶[2] Neil R.Foster 蒲源[1] 

机构地区：[1]北京化工大学化学工程学院超临界流体技术与应用研究中心,北京100029 [2]煤炭科学研究总院,北京100013

出　　处：《北京化工大学学报（自然科学版）》2016年第3期60-65,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金(21306005);国家"863"计划(2013AA032001)

摘　　要：通过共溶剂水热法制备五氧化二钒纳米棒,使用X射线衍射仪(XRD)、扫描电子显微镜(SEM、EDS)、电化学工作站和蓝电测试系统对样品的形貌结构和电化学性能进行分析。结果表明,所得样品均为纯V_2O_5相,结晶度较高;金属离子掺杂后V_2O_5的形貌由棒状变成微球状。CV曲线结果表明,该材料作为锂离子电池正极材料时具有良好的可逆性;掺杂金属铜离子的V_2O_5表现出更好的电化学性能,初始比容量为273.30 m A·h/g,在循环50次后,容量保持率为99.04%;金属铜离子的掺杂可进一步提高材料的电化学性能。A co-solvent hydrothermal process has been used to synthesize nano-structured vanadium oxides. X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,EDS,an electrochemical workstation and a blue electric testing system were employed to analyze the morphology,structure and electrochemical properties of the samples.The results show that pure vanadium pentoxide was successfully prepared. Rod-like nano-V_2O_5 with good crystallinity was obtained. The CV results showed the material has good reversibility. When repeatedly charged-discharged at2- 4 V,the specific capacity of the as-prepared V-Cu was stable at around 273. 30 m A·h / g. The capacity retention ratio was 99. 04% after 50 charge-discharge cycles. The copper ion dopant significantly improved the electrochemical performance of V_2O_5,and the resulting material shows promise for application in lithium ion batteries.

关 键 词：五氧化二钒 纳米棒 共溶剂水热法 金属离子掺杂 正极材料 电化学性能 

分 类 号：TQ152[化学工程—电化学工业]