收稿日期: 2018-12-05
网络出版日期: 2020-12-29
Composite of covalent organic framework-derived nitrogen-doped carbon with carbon nanotubes for lithium-storage
Received date: 2018-12-05
Online published: 2020-12-29
通过常温法设计并合成了钴金属修饰的共价有机骨架 (covalent organicframework, COF) 结构, 然后以此为前驱体,通过修饰的钴金属中心在一步煅烧过程中原位催生碳纳米管 (carbonnanotube, CNT), 从而获得氮掺杂碳/碳纳米管杂化复合材料.氮的掺杂进一步增加了该复合材料的储锂活性位点,并有效提高了材料的电子和离子的电导率. 在作为锂离子电池负极材料时,该氮掺杂的碳/碳纳米管杂化复合材料展现了较高的比容量和较好的循环稳定性,在经过 300 圈的充放电循环后, 其比容量保持在 652 mA·h·g-1.
汤旭旭, 杨秦斯, 杨建伟, 孙炜伟 . 共价有机骨架衍生的氮掺杂碳/碳纳米管杂化结构的储锂性能[J]. 上海大学学报(自然科学版), 2020 , 26(6) : 972 -979 . DOI: 10.12066/j.issn.1007-2861.2111
The covalent organic framework, obtained by the facile room-temperature method, was selected as the precursor for fabricating the nitrogen-doped carbon/carbon nanotube composite (N-C-CNT), in with the nitrogen-doped carbon was derived directly from the covalent organic framework, while the carbon nanotubes were formed in situ from acetylene under catalysis by metallic cobalt. Due to N-doping, the carbon layer provides more active sites for lithium storage; therefore, the N-C-CNT composite exhibits high specific capacity and excellent cycle stability (reversible capacity of 652 mA·h·g-1 after300 cycles) as an anode material for lithium ion batteries.
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