锂(药物)
阳极
材料科学
介电谱
X射线光电子能谱
循环伏安法
拉曼光谱
扫描电子显微镜
碳纤维
电化学
透射电子显微镜
碳化
化学工程
分析化学(期刊)
纳米技术
电极
化学
复合材料
有机化学
复合数
物理化学
内分泌学
工程类
物理
光学
医学
作者
Xiaojie Zhang,Guang Zhu,Miao Wang,Jiabao Li,Ting Lu,Likun Pan
出处
期刊:Carbon
[Elsevier]
日期:2017-02-20
卷期号:116: 686-694
被引量:283
标识
DOI:10.1016/j.carbon.2017.02.057
摘要
Abstract N-doped porous carbon materials (NPCs) were prepared by the carbonization of covalent-organic frameworks as precursors and used as anodes for lithium and sodium ion batteries (LIBs and SIBs) for the first time. The morphology, structure and electrochemical performance were characterized and evaluated by field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction, nitrogen adsorption and desorption isotherms, galvanostatic charge/discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy, respectively. The NPCs not only show high maximum reversible charge capacities of 488 mAh g−1 at 100 mA g−1 (LIBs) and 237.7 mAh g−1 at 50 mA g−1 (SIBs) after 100 cycles, but also deliver high reversible charge capacities of 143 mAh g−1 at 5 A g−1 (LIBs) and 88.8 mAh g−1 at 2.5 A g−1 (SIBs) and excellent rate performance. Moreover, superior long-life cycling stability is observed for 5000 cycles even at a very high current density of 5 A g−1 for LIBs and 2.5 A g−1 for SIBs. The excellent electrochemical performance of NPCs with superior reversible capacity, good rate performance, and long-life cycling stability is attributed to their N doping, high specific surface area and porous structure with large interlayer distance.
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