Li₃V₂(PO₄)₃/C nanofibers composite as a high performance cathode material for?lithium-ion battery

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• 作者：Quanqi Chen^a ; ^b ; ^{quanqi.chen@yahoo.com} ; ^{quanqi.chen@glut.edu.cn} ; Tingting Zhang^b ; Xiaochang Qiao^b ; Diquan Li^c ; ^{lidiquan@126.com} ; Jianwen Yang^a
• 关键词：Nanofibers ; Lithium vanadium phosphate ; Electrospinning method ; Lithium-ion batteries ; Composite
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 July, 2013
• 年：2013
• 卷：234
• 期：Complete
• 页码：197-200
• 全文大小：821 K

文摘

A novel Li₃V₂(PO₄)₃/C nanofibers composite has been first prepared by a facile and environmentally friendly electrospinning method using NH₄VO₃, CH₃COOLi, poly (4-vinyl) pyridine (PVP) and citric acid aqueous solution as raw materials. The composite is investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and electrochemical tests. The Li₃V₂(PO₄)₃/C nanofibers composite exhibits excellent cycle performance and good rate capability in the voltage range of 3.0-4.8?V. The composite displays a high discharge capacity of 190?mAh?g^?1 (close to theoretical capacity of 197?mAh?g^?1) at 0.1?C (19.7?mA?g^?1). Even at a high-rate of 20?C, the composite presents the discharge capacity of 132?mAh?g^?1 and good cycle performance. The outstanding electrochemical performance is attributed to the particular morphology and microstructure of Li₃V₂(PO₄)₃/C nanofibers composite that dispersive Li₃V₂(PO₄)₃ nanofibers and carbon nanofibers aggregate to form nanofibers composite with mesopores and large surface area.