Preparation and electrochemical performances of LiFePO4/C composite nanobelts via facile electrospinning |
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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 nanobelts were synthesized by calcination of the LiOH + Fe(NO3)3 + H3PO4]/polyvinyl pyrrolidone (PVP) electrospun nanobelts. PVP was used as the electrospinning template and carbon source. During the calcination, LiOH + Fe(NO3)3 + H3PO4] were transformed to lithium iron phosphate (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 width of LiFePO4/C composite nanobelts is 2.50 ± 0.33 μm, the average thickness is about 162 nm and the BET specific surface area is 19.4 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 123.38 mAh g?1 and there is no obvious capacity fading after 50 cycles. The formation mechanism of LiFePO4/C composite nanobelts was also proposed. |
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