報告題目：Carbon Nanofibers with Controlled Nanostructures for LiB Electrodes by Electrospinning
報告人：Yiu-Wing Mai (Centre for Advanced Materials Technology, The University of Sydney)
報告時間：2015年7月22日上午10:00
報告地點：9-506
主辦單位：航空宇航學院、機械結構力學及控制國家重點實驗室、國際交流合作處
Abstract: In recent years, much attention has been paid to rechargeable lithium ion batteries (LIBs) due to their high energy density and long cycle lifetime. Most research activities are concerned with developing novel electrode materials with sufficiently high energy and power density for applications of LIBs in high-power devices, such as electric vehicles (EV) and hybrid electric vehicles (HEV). In our previous studies, we have successfully prepared amorphous carbon nanofibers and carbon nanotubes decorated with hollow graphitic carbon nanospheres by electrospinning. A hollow-tunnel structure in electrospun carbon/Ni nanofibres was also produced by diffusing Ni nanoparticlesfrom the graphitic carbon spheres into the amorphous carbon nanofibres, which turns amorphous carbon into graphitic carbon. The resultant materials were further treated by chemical activation and acid treatment to develop activated N-doped hollow-tunneled graphitic carbon nanofibers. We demonstrated that these N-doped nanofibers are excellent anode materials for LIBs, displaying a superhigh reversible specific capacity of over ~1560 mAh g-1 and a remarkable volumetric capacity of ~1.8 Ah cm-3 at a current density of 0.1 A g-1 with outstanding rate capability and good cycling stability. Our results point to a new path for fabrication of polymer-based graphitic carbon nanofibers with a favorable nanostructure comprising N-doping, a high surface area, and a porous structure.
