用于高性能锂离子电池的氮自掺杂壳聚糖衍生碳的简便可控合成方法

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY Carbon Letters Pub Date : 2023-10-02 DOI:10.1007/s42823-023-00612-1

Wentao Xia, Miao Cheng, Jing Hu, Qianqian Liu, Tao Wei, Ruirui Wang, Wanfei Li, Bo Liu

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引用次数: 0

摘要

N掺杂含量和构型对碳阳极的电化学性能有重要影响。在此，我们提出了一种简单的方法，通过在前驱体中引入 2ZnCO3-3Zn(OH)2 来合成具有可控 N 掺杂类型的高 N 自掺杂壳聚糖衍生碳。与 NC-CS 电极相比，合成的 NC-CS/2ZnCO3-3Zn(OH)2 电极显示出两倍以上的可逆容量（在 200 mA g-1 下循环 100 次后为 518 mAh g-1）、优异的速率性能和出色的循环稳定性。这一明显改善主要归功于 N 掺杂含量的增加（尤其是吡咯烷酮-N 的含量），它提供了更多的活性位点并有利于 Li+ 扩散动力学。本研究开发了一种经济高效、简便易行的合成路线，用于制备具有可调掺杂位点的高性能 N 自掺杂碳，并将其应用于可充电电池。

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Facile and controllable synthesis of nitrogen self-doped chitosan-derived carbon for high-performance Li-ion batteries

N-doping content and configurations have a significant effect on the electrochemical performance of carbon anodes. Herein, we proposed a simple method to synthesize highly N self-doped chitosan-derived carbon with controllable N-doping types by introducing 2ZnCO₃·3Zn(OH)₂ into the precursor. The as-synthesized NC-CS/2ZnCO₃·3Zn(OH)₂ electrode exhibited more than twice the reversible capacity (518 mAh g⁻¹ after 100 cycles at 200 mA g⁻¹) compared to the NC-CS electrode, superior rate performance and outstanding cycling stability. The remarkable improvement should be mainly attributed to the increase of N-doping content (particularly the pyrrolic-N content), which provided more active sites and favored Li⁺ diffusion kinetics. This study develops a cost-effective and facile synthesis route to fabricate high-performance N self-doped carbon with tunable doping sites for rechargeable battery applications.

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.