CAJ | 학술논문

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／V205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单体己插入中空型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.
위개선정태V2O5 (c-V2O5)정겁재료실제용량교저、순배성능교차등문제,제비료공심구취필각／V205복합재료.이용도전필각단체(Py)재중공형V2O5층간발생원위양화취합반응제비취필각(PPy)/중공형V2O5복합재료( HS-PPy/V2O5).채용X사선연사의(XRD)、소묘전경(SEM)、투사전경(TEM)대양품진행표정,채용항류충방전측시화전화학조항(EIS)측시양품적전화학성능.결과표명,Py단체기삽입중공형V2O5층간,여순중공형V2O5상비,제비적HS-PPY/V2O5복합재료비용량수연유소감소,단시순배은정성유교대적제고.
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.