期刊
ENERGY TECHNOLOGY
卷 4, 期 9, 页码 1047-1052出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201600056
关键词
batteries; carbon; electrodes; lithium; nanostructures
资金
- Changsha Research Institute of Mining and Metallurgy, Co. Ltd
- National Natural Science Foundation of China [51274106, 51474113, 51474037]
- Science and Technology Support Program of Jiangsu Province of China [BE2014850]
- Natural Science Research Program of Jiangsu Province Higher Education of China [14KJB430010]
- Jiangsu Province's Postgraduate Cultivation and Innovation Project of China [SJZZ15-0131]
- Jiangsu Overseas Research & Training Program for University Young & Middle-Aged Teachers and Presidents
Flexible lithium vanadium phosphate/carbon nanofiber (i.e., Li3V2(PO4)(3)/C) were fabricated by an electrospinning process combined with hot-pressed sintering, and are used in lithium-ion batteries as selfstanding, binderfree and flexible cathodes. The microstructure and crystalline phase of the as-prepared films are characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffractometry. The electrochemical properties of the Li3V2(PO4)(3)/C nanofiber films were analyzed by cyclic voltammetry and galvanostatic charge/discharge tests. When the nanofiber precursor was sintered at 850 degrees C for 20h, the resulting film displays high flexibility and crystallinity. This selfstanding Li3V2(PO4)(3)/C film exhibits a superior rate performance even at 20C and good cycle ability, with a retention capacity of 112mAhg(-1) at a current density of 1C after 1000 cycles and 71mAhg(-1) at 5C after 800 cycles. These features are attributed to the special composite structure formed by the Li3V2(PO4)(3) and the carbon support, and the 3D long-range conductive networks.
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