Preparation of S/N-codoped carbon nanosheets with tunable interlayer distance for high-rate sodium-ion batteries,Green Chemistry

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Preparation of S/N-codoped carbon nanosheets with tunable interlayer distance for high-rate sodium-ion batteries
Green Chemistry ( IF 9.3 ) Pub Date : 2017-08-17 00:00:00 , DOI: 10.1039/c7gc01942d
Guoqiang Zou _{1,

2,

3,

4} , Hongshuai Hou _{1,

2,

3,

4} , Ganggang Zhao _{1,

2,

3,

4} , Zhaodong Huang _{1,

2,

3,

4} , Peng Ge _{1,

2,

3,

4} , Xiaobo Ji _{1,

2,

3,

4}

Affiliation

The conventional strategies for obtaining S/N-codoped carbon materials suffer from a series of problems caused by their complicated experimental procedures. Here, S,N-codoped carbon nanosheets were firstly prepared by a solvent-free one-pot method, displaying an ultra-thin sheet-like structure, a tunable interlayer distance ranging from 0.37 nm to 0.41 nm, and a large surface area up to 809 m² g⁻¹. When they were used as an anode for sodium-ion batteries (SIBs), an outstanding sodium-ion storage performance of 380 mA h g⁻¹ was acquired at 100 mA g⁻¹, which can be attributed to the expanded interlayer distance caused by the introduction of the large covalent radius-sulfur. The initial coulombic efficiency improved to 60.9%, which may benefit from N-doping. Most importantly, an excellent rate capability of ∼178 mA h g⁻¹ was observed at a current density of 5 A g⁻¹ after 5000 cycles, which is among best of the state-of-the-art carbon-based SIBs. Interestingly, the morphology of the obtained carbon materials can be tuned from bulk to flake by adjusting the sulfur content or temperature. Given this, this work provides a new method to construct co-doped carbon (especially tri-doped and multi-doped carbon) and shows that the strategy of co-doping of heteroatoms can effectively optimize the nano/microstructure and enhance the rate capability of the carbon materials.

中文翻译：

具有可调层间距离的S / N掺杂碳纳米片的制备用于高速率钠离子电池

获得S / N掺杂的碳材料的常规策略由于其复杂的实验程序而遭受一系列问题。在这里，首先通过无溶剂一锅法制备S，N掺杂的碳纳米片，显示出超薄的片状结构，可调节的层间距离为0.37 nm至0.41 nm，并且表面积较大至809 m ² g ^-1。当它们用作钠离子电池（SIB）的阳极时，在100 mA g ^-1时可获得380 mA hg ^-1的出色钠离子存储性能，这可以归因于大共价半径硫的引入引起的层间距离的扩大。初始库仑效率提高到60.9％，这可能会受益于N掺杂。最重要的是，在5 A g ^-1的电流密度下，观察到出色的〜178 mA hg ^-1的速率能力经过5000次循环，这是最先进的碳基SIB之一。有趣的是，可以通过调节硫含量或温度将获得的碳材料的形态从松散调整为薄片状。鉴于此，这项工作提供了一种构造共掺杂碳（尤其是三掺杂和多掺杂碳）的新方法，并表明共掺杂杂原子的策略可以有效地优化纳米/微结构并提高其速率能力。碳材料。

更新日期：2017-09-04

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