Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 3 Research Link, Singapore 117602.
ACS Appl Mater Interfaces. 2013 Dec 11;5(23):12275-82. doi: 10.1021/am4043867. Epub 2013 Nov 26.
A novel biomass-based nitrogen-doped free-standing fused carbon fibrous mat was fabricated from lignin-polyethylene oxide (PEO) (90:10) blend via electrospinning followed by carbonization and thermal annealing in the presence of urea. The morphology and structure of the carbon fibers were characterized by field-emission scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and elemental analysis, and their electrochemical properties were investigated for the first time as anode in lithium ion batteries (LIBs). The fused carbon fibers without nitrogen doping exhibited high specific capacity up to 445 mA h g(-1) at a current density of 30 mA g(-1) (comparable to polyacrylonitrile (PAN) derived carbon nanofibers) and good cyclic stability at different current rates. After thermal annealing in the presence of urea, the charge capacity was further improved to as high as 576 mA h g(-1) and still maintained a good capacity of about 200 mAh g(-1) even at a high current rate of 2000 mA g(-1). This research demonstrates the great promise of lignin-derived nanocarbon materials for applications in energy storage systems.
一种新型的生物质基氮掺杂自支撑熔纺碳纤维毡是通过静电纺丝，随后碳化和热退火在尿素存在下制备的，其原料是木质素-聚氧化乙烯（PEO）（90：10）共混物。采用场发射扫描电子显微镜、拉曼光谱、X 射线光电子能谱和元素分析对碳纤维的形貌和结构进行了表征，并首次将其作为锂离子电池（LIBs）的阳极研究了其电化学性能。未经氮掺杂的熔纺碳纤维在 30 mA g-1 的电流密度下表现出高达 445 mA h g-1 的高比容量（与聚丙烯腈（PAN）衍生的碳纳米纤维相当），并且在不同电流速率下具有良好的循环稳定性。在尿素存在下进行热退火后，充电容量进一步提高到 576 mA h g-1，即使在 2000 mA g-1 的高电流速率下，仍保持约 200 mAh g-1 的良好容量。这项研究证明了木质素衍生的纳米碳材料在储能系统中的应用具有很大的潜力。
