Preparation and li storage properties of hierarchical porous carbon fibers derived from alginic acid.
Preparation and li storage properties of hierarchical porous carbon fibers derived from alginic acid.
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DOI：
10.1002/cssc.201000035
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发表时间：
2010-06
期刊：
影响因子：
8.4
通讯作者：
Xing-Long Wu;Li-Li Chen-Li;Sen Xin;Ya‐Xia Yin;Yu‐Guo Guo;Qingshan Kong;Yanlin Xia
中科院分区：
文献类型：
--
作者：
Xing-Long Wu;Li-Li Chen-Li;Sen Xin;Ya‐Xia Yin;Yu‐Guo Guo;Qingshan Kong;Yanlin Xia
采用控制碳化法制备了一维多孔炭纤维，并用扫描电子显微镜、透射电子显微镜、X射线衍射仪、X射线光电子能谱、拉曼光谱、氮气吸附-脱附等温线和电化学测试等手段对其进行了表征。所得到的HPCF由直径小于10 nm的纳米碳颗粒组成的三维网络组成，并呈现出由微孔和中孔组成的分级多孔结构。电化学测试表明，与商用石墨相比，HPCF作为锂离子电池负极材料具有优异的倍率性能和容量保持率。在45℃的充放电倍率下，HPCF在1500次循环后的可逆容量仍高达80 mA h g(-1)，约为商品石墨负极的5倍。HPCF电化学性能的提高主要归功于纳米级的构筑块、层次化的多孔结构和一维形貌。
One-dimensional (1D) hierarchical porous carbon fibers (HPCFs) have been prepared by controlled carbonization of alginic acid fibers and investigated with scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, nitrogen adsorption-desorption isotherms, and electrochemical tests toward lithium storage. The as-obtained HPCFs consist of a 3D network of nanosized carbon particles with diameters less than 10 nm and exhibit a hierarchical porous architecture composed of both micropores and mesopores. Electrochemical measurements show that HPCFs exhibit excellent rate capability and capacity retention compared with commercial graphite when employed as anode materials for lithium-ion batteries. At the discharge/charge rate of 45 C, the reversible capacity of HPCFs is still as high as 80 mA h g(-1) even after 1500 cycles, which is about five times larger than that of commercial graphite anode. The much improved electrochemical performances could be attributed to the nanosized building blocks, the hierarchical porous structure, and the 1D morphology of HPCFs.