Electrospun porous carbon nanofibers as lithium ion battery anodes
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Porous carbon nanofibers were fabricated by electrospinning in a precursor solution containing polyacrylonitrile (PAN), polymethyl methacrylate (PMMA), and N,N-dimethylformamide. During thermal treatment, PMMA decomposition caused nanofibers to transform from a solid to a porous structure. Removal of PMMA also decreased the fiber diameter and increased the pore volume of the carbon nanofibers, resulting in a substantial increase in specific surface area. We used these web-type fiber films directly without a binder as an anode for lithium ion batteries. The electrochemical performance of these 5:5 PAN/PMMA-derived carbon nanofibers exhibited a discharge capacity of 446 mAh/g under a current density of 150 mA/g, which was approximately two times that of the neat PAN-derived carbon nanofibers. Additionally, the discharge capacity retention of the 5:5 PAN/PMMA-derived carbon nanofibers was nearly the same as that of the neat PAN-derived carbon nanofibers, indicating favorable cycle stability.
KeywordsLithium ion battery Anode materials Carbon nanofibers Electrospinning
This work is financially supported by the Ministry of Science and Technology in Taiwan under Grant No. 102-2221-E-006-018-MY3 and the Technology Development Program for Academia No. 103-EC-17-A-08-S1-204 by Ministry of Economic Affairs in Taiwan.
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