Preparation and electrochemical performance of hollow-spherical polypyrrole/V_2O_5 composite  

空心聚吡咯/V_2O_5复合材料的制备及其电化学性能(英文)

作　　者：王远洪[1] 刘恒[1] 朱丁[1] 郭再萍 刘华坤 窦诗学 

机构地区：[1]四川大学材料科学与工程学院,成都610065 [2]Institute for Superconducting and Electronic Mater ials,University of Wollongong

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第6期1303-1308,共6页中国有色金属学报（英文版）

基　　金：Project(50574063)supported by the National Natural Science Foundation of China

摘　　要：In order to improve the lower practical capacity and bad cyclability of crystalline V2O5（c-V2O5）,the vanadium oxide（V2O5） and polypyrrole（PPy） hybrid with hollow-spherical（HS） structure was studied.HS nanocomposite comprised of conductive polypyrrole and vanadium pentoxide（PPy/V2O5） was synthesized by polymerization of pyrrole monomer（Py） in the hollow-microspherical V2O5 host.This novel hybrid was characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and tested as the cathode material for lithium-ion batteries（LIB） by galvanostatic cell cycling and electrochemical impedance spectroscopy（EIS）.The hollow-spherical polypyrrole/vanadium oxide（HS-PPy/V2O5） composites,in which PPy molecules are intercalated between the layers of V2O5,exhibit slight reduced capacity and substantially improve cyclability and electrochemical activity compared with the pure HS-V2O5.为改善晶态V2O5(c-V2O5)正极材料实际容量较低、循环性能较差等问题,制备了空心球聚吡咯/V2O5复合材料。利用导电吡咯单体(Py)在中空型V2O5层间发生原位氧化聚合反应制备聚吡咯(PPy)/中空型V2O5复合材料(HS-PPy/V2O5)。采用X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)对样品进行表征,采用恒流充放电测试和电化学阻抗(EIS)测试样品的电化学性能。结果表明,Py单体已插入中空型V2O5层间,与纯中空型V2O5相比,制备的HS-PPY/V2O5复合材料比容量虽然有所减小,但是循环稳定性有较大的提高。

关 键 词：V2O5 hollow microspheres CATHODE lithium-ion batteries 

分 类 号：TB33[一般工业技术—材料科学与工程]