摘要
GeO2–C fibers were successfully synthesized using electrospinning homogeneous sol and subsequent calcination in an inert atmosphere. The spinnable sol was prepared by adding polyacrylonitrile（PAN）and polyvinylpyrrolidone（PVP） in a weight ratio of 1：1 into a mixture with white precipitate produced by dropping GeCl4 into DMF. X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）,thermogravimetric analysis（TGA）, scanning electron microscopy（SEM） and transmission electron microscopy（TEM） were employed to characterize the as-obtained fibers, and electrochemical tests were conducted to measure electrochemical performance of the electrode. The electrospun fibers have uniform diameters of 300 nm. After being calcined at 600 8C for 2 h in Ar, they transform to amorphous GeO2–C fibers with the same morphologies. The Ge O2–C fibers exhibit excellent cycling stability with a high reversible capacity of 838.93 m A h g^-1after 100 cycles at a current density of 50 m A g^-1, indicating the composite fibers could be promising anode candidates for lithium-ion batteries.
GeO2–C fibers were successfully synthesized using electrospinning homogeneous sol and subsequent calcination in an inert atmosphere. The spinnable sol was prepared by adding polyacrylonitrile（PAN）and polyvinylpyrrolidone（PVP） in a weight ratio of 1：1 into a mixture with white precipitate produced by dropping GeCl4 into DMF. X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）,thermogravimetric analysis（TGA）, scanning electron microscopy（SEM） and transmission electron microscopy（TEM） were employed to characterize the as-obtained fibers, and electrochemical tests were conducted to measure electrochemical performance of the electrode. The electrospun fibers have uniform diameters of 300 nm. After being calcined at 600 8C for 2 h in Ar, they transform to amorphous GeO2–C fibers with the same morphologies. The Ge O2–C fibers exhibit excellent cycling stability with a high reversible capacity of 838.93 m A h g^-1after 100 cycles at a current density of 50 m A g^-1, indicating the composite fibers could be promising anode candidates for lithium-ion batteries.
基金
supported by Shanghai Municipal Education Commission(High-energy Beam Intelligent Processing and Green Manufacturing)and Graduate Students Innovation Program of Shanghai University of Engineering Science(No.E1-0903-15-01040)
