Electrospinning fabrication and electrochemical properties of LiFePO4/C composite nanofibers |
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| Authors: | Dongqun Shao Jinxian Wang Xiangting Dong Wensheng Yu Guixia Liu Feifei Zhang Limin Wang |
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| Affiliation: | 1. Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun, 130022, China
2. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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| Abstract: | LiFePO4/C composite nanofibers were synthesized by calcination of the [LiOH + Fe(NO3)3 + H3PO4]/PVP electrospun nanofibers. Polyvinyl pyrrolidone (PVP) was used as the electrospinning template and carbon source. During the calcination [LiOH + Fe(NO3)3 + H3PO4] were transformed to LiFePO4 and PVP was decomposed into carbon. The morphology and properties of the as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller (BET) specific surface area analysis, electrochemical impedance spectroscopy and galvanostatic charge–discharge measurements. The results indicate that the mean diameter of as-prepared LiFePO4/C composite nanofibers is 179.08 ± 29.66 nm and the BET specific surface area is 66.59 m2 g?1. The addition of carbon does not affect the structure of LiFePO4, but improves its electrochemical performances. At the current density of 0.2 C, the initial discharge capacity of LiFePO4/C electrode is 133.6 mAh g?1 and there is no obvious capacity fading after 100 cycles. The formation mechanism of the LiFePO4/C composite nanofibers was also proposed. |
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