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High N-doped hierarchical porous carbon networks with expanded interlayers for efficient sodium storage

有为有效的钠存储的扩展夹层的高做 N 的层次多孔的碳网络

作     者:Dongqin Su Man Huang Junhao Zhang Xingmei Guo Jiale Chen Yanchun Xue Aihua Yuan Qinghong Kong Dongqin Su;Man Huang;Junhao Zhang;Xingmei Guo;Jiale Chen;Yanchun Xue;Aihua Yuan;Qinghong Kong

作者机构:School of Envronmental and Chemical EngineeringJiangsu University of Science and TechnologyZhenjiang 212003China School of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013China 

出 版 物:《Nano Research》 (纳米研究(英文版))

年 卷 期:2020年第13卷第10期

页      面:2862-2868页

核心收录:

学科分类:0808[工学-电气工程] 08[工学] 

基  金:The work was financially supported by the National Natural Science of Foundation of China(No.51672114) the Natural Science Foundation of Jiangsu Province(No.BK20181469) the Zhenjiang Key Research and Development Project(Social Development)(No.SSH20190140049) 

主  题:hierarchical porous carbon networks high N doping expanded interlayer spacing anode sodium-ion batteries 

摘      要:Sodium-ion batteries (SIBs) have been attracting considerable attention as a promising candidate for large-scale energy storage because of the abundance and low-cost of sodium resources. However, lack of appropriate anode materials impedes further applications. Herein, a novel self-template strategy is designed to synthesize uniform flowerlike N-doped hierarchical porous carbon networks (NHPCN) with high content of N (15.31 at.%) assembled by ultrathin nanosheets via a self-synthesized single precursor and subsequent thermal annealing. Relying on the synergetic coordination of benzimidazole and 2-methylimidazole with metal ions to produce a flowerlike network, a self-formed single precursor can be harvested. Due to the structural and compositional advantages, including the high N doping, the expanded interlayer spacing, the ultrathin two-dimensional nano-sized subunits, and the three-dimensional porous network structure, these unique NHPCN flowers deliver ultrahigh reversible capacities of 453.7 mAh·g^−1 at 0.1 A·g^−1 and 242.5 mAh·g^−1 at 1 A·g^−1 for 2,500 cycles with exceptional rate capability of 5 A·g^−1 with reversible capacities of 201.2 mAh·g^−1. The greatly improved sodium storage performance of NHPCN confirms the importance of reasonable engineering and synthesis of hierarchical carbon with unique structures.

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