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| Effect of Heat Treatment on Structure and Lithium Ion Storage Properties of N-Rich Carbon Nanofibers |
| Author Name | Affiliation | E-mail | | WANG Jing-Jing | The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China | | | ZAHNG Jiang | The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China | zhangjiang@wust.edu.cn | | WANG Jin-Yue | The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China | | | WANG Lu | Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China | | | LI Xuan-Ke | The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China | |
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| Abstract: Carbon nanofibers (CNFs) were prepared from polyacrylonitrile (PAN) via electrospinning followed by stabilization and carbonization. The morphology and structure of the carbon nanofibers were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray photo-electron spectroscopy (XPS). The electrochemical properties were investigated as anode material in lithium ion batteries (LIBs). A systematic study was made to confirm the effect of the nitrogen species on the performance of lithium ion storage and the capacities of anodes in LIBs. It is noticed that the structure change has a great influence on the storage position of lithium ion in CNFs electrode. The results showed that lithium ions can be stored not only between the graphitized carbon layers, but also in the defects caused by the functionalization of nitrogen, the latter was mainly because the improvement of the electrochemical performance of LIBs due to the N-doping of carbon materials. There is a strong correlation between the atomic structure, with lithium ion storage behavior and electrochemical properties of anode materials. It is revealed that thermal annealing had an important effect on the atomic structure and morphology of CNFs. A high temperature treatment promoted graphitization and improved electrical conductivity through the growth of aromatic groups. During the transition from amorphous carbon to graphite structure at high temperature, defects and heteroatoms were removed with the decrease of nitrogen contents. Therefore, CNFs obtained at high carbonization temperature may have high lithium ion storage capacity between graphene layers, but it failed to provide attractive capacity due to low nitrogen content. An optimized carbonization temperature of 600℃ was identified, the electrode gave rise to a sufficiently high nitrogen content and thus a high capacity about 560 mAh·g-1 after 200 cycles at the current density of 0.1 A·g-1, the specific capacity at the high current density of 1 A·g-1 even still remained 200 mAh·g-1 after 1 000 cycles. |
| Keywords: anode materials carbon nanofiber electrospinning PAN N-doping |
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| WANG Jing-Jing,ZAHNG Jiang,WANG Jin-Yue,WANG Lu,LI Xuan-Ke.Effect of Heat Treatment on Structure and Lithium Ion Storage Properties of N-Rich Carbon Nanofibers[J].Chinese Journal of Inorganic Chemistry,2020,36(1):31-39. |
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