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 polyvinylpyrro...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.展开更多
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)
文摘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.
