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Nitrogen-enriched Carbon Nanofibers with Tunable Semi-ionic C-F bonds as a Stable Long cycle Anode for Sodium-Ion Batteries
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-09-16 , DOI: 10.1016/j.jcis.2020.09.025
Xuemei Yan , Shuaitong Liang , Haiting Shi , Yanli Hu , Liyan Liu , Zhiwei Xu

The quest for getting more efficient carbonous anodes for sodium ion batteries (NIBs) prepared by simple and economical methods continues to be an important endeavor. Herein, a plasma-controlled method is developed for preparing semi-ionic C-F bonds decorating nitrogen-enriched electrospinning carbon nanofibers (NCNFs) as a free-standing anode for NIBs. The semi-ionic C-F bonds are beneficial to the fast ion and electron transfer for a free-standing electrode, which remarkably improves the rate performances of NCNFs as the NIBs anodes. The optimized sample delivers a reversible capacity of 199 mA h g-1 at 0.1 A g−1 and displays excellent long-term stability with reversible specific capacity around 150 mA h g-1 over 2000 cycles at 500 mA g-1 after the rate capability test. Moreover, the presence of semi-ionic C-F bonds on plasma nitrogen-enriched electrospinning carbon nanofibers surfaces can reduce the resistance of the anode, thereby showing a more stable solid electrolyte interphase SEI) after electrochemical cycles.



中文翻译:

具有可调半离子CF键的富氮碳纳米纤维,可作为钠离子电池的稳定长循环阳极

寻求通过简单且经济的方法制备用于钠离子电池(NIB)的碳质阳极的效率更高,仍然是一项重要的工作。在本文中,开发了一种等离子体控制方法来制备半离子CF键,以装饰富氮的静电纺丝碳纳米纤维(NCNF)作为NIB的独立阳极。半离子CF键有利于独立式电极的快速离子和电子转移,这显着提高了NIB作为阳极的NCNF的速率性能。优化的样品提供199毫安Hg的可逆容量-1 0.1 A G -1,并显示优异的长期稳定性与周围150毫安汞柱可逆比容量-1超过2000次循环以500mA克-1经过速率能力测试。此外,在等离子体富氮的电纺碳纳米纤维表面上存在半离子CF键可以降低阳极的电阻,从而在电化学循环后显示出更稳定的固体电解质相间(SEI)。

更新日期:2020-09-16
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