Poplar flower-like nitrogen-doped carbon nanotube@VS4 composites with excellent sodium storage performance,Inorganic Chemistry Frontiers

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Poplar flower-like nitrogen-doped carbon nanotube@VS4 composites with excellent sodium storage performance
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-10-13 , DOI: 10.1039/d0qi00985g
Fei Yang _{1,

2,

3,

4} , Wen Zhong _{1,

2,

3,

4} , Manman Ren _{1,

2,

3,

4,

5} , Weiliang Liu _{1,

2,

3,

4} , Mei Li _{1,

2,

3,

4} , Guangda Li _{1,

2,

3,

4} , Liwei Su _{4,

6,

7,

8,

9}

Affiliation

As a new anode material for sodium-ion batteries (SIBs), VS₄ shows impressive energy storage potential due to its unique one-dimensional parallel chain structure, large chain spacing and high sulfur content. Here, poplar flower-like nitrogen-doped carbon nanotube@VS₄ composites (NCNt@VS₄) with a three-dimensional structure were successfully synthesized via a solvothermal reaction using nitrogen-doped carbon nanotube (NCNt) as a template. The unique three-dimensional structure can enhance the transmission of electrons and sodium ions, conducive to wetting of the electrolyte and buffering the huge volume change. Therefore, NCNt@VS₄ delivers excellent sodium storage performance. It presents a reversible capacity of 430 mA h g⁻¹ after 2000 cycles at 1 A g⁻¹, and demonstrates a high initial coulombic efficiency (81.6%). At the same time, the electrode exhibits superior rate-performance (460 mA h g⁻¹ at 5 A g⁻¹) and high ability to tolerate current changes. This work develops a reliable method for the preparation of other 3D NCNt@transition metal sulfide composites, which exhibit great potential as an anode for SIBs.

中文翻译：

杨树花状氮掺杂碳纳米管@ VS4复合材料，具有优异的钠存储性能

作为钠离子电池（SIB）的新阳极材料，VS ₄由于其独特的一维平行链结构，大链间距和高硫含量而显示出令人印象深刻的储能潜力。在此，以氮掺杂碳纳米管（NCNt）为模板，通过溶剂热反应成功合成了三维结构的杨花状氮掺杂碳纳米管VS ₄复合材料（NCNt @ VS ₄）。独特的三维结构可以增强电子和钠离子的传输，有利于电解质的润湿并缓冲巨大的体积变化。因此，NCNt @ VS ₄具有出色的钠存储性能。它提出430毫安Hg的可逆容量^-1 1个A G在2000次循环之后^-1，并演示了高的初始库仑效率（81.6％）。同时，电极具有优异的速率性能（460毫安汞柱^-1在5 A G ^-1）和耐受电流变化的高的能力。这项工作为制备其他3D NCNt @过渡金属硫化物复合材料提供了一种可靠的方法，该复合材料具有作为SIB阳极的巨大潜力。

更新日期：2020-11-03

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