Two-dimensional fence-like Co-doped NiSe2/C nanosheets as an anode for half/full sodium-ion batteries,Inorganic Chemistry Frontiers

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Two-dimensional fence-like Co-doped NiSe2/C nanosheets as an anode for half/full sodium-ion batteries
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-10-26 , DOI: 10.1039/d0qi01172j
Siwei Fan _{1,

2,

3,

4} , Guangda Li _{1,

2,

3,

4} , Jianyu Liu _{1,

2,

3,

4}

Affiliation

Two-dimensional fence-like Co-doped NiSe₂/C (Co-NiSe₂/C) nanosheets are fabricated via a facile solvothermal method followed by a selenization strategy. The Co-NiSe₂/C nanosheets are composed of interlaced nanorods, which are made up of small nanoparticles with a size of 20 nm. The surfaces of these small nanoparticles are covered in thin carbon layers. The material displays excellent long-term cycle life (306.1 mA h g⁻¹ after 5000 cycles at 5 A g⁻¹), rate capability (260.1 mA h g⁻¹ at 10 A g⁻¹), and full cell performance (269.1 mA h g⁻¹ after 100 cycles at 0.5 A g⁻¹) as an anode for SIBs. Furthermore, the Na storage mechanism and the reaction kinetics are discussed based on ex situ X-ray diffraction analysis, cyclic voltammetry measurements, a galvanostatic intermittent titration technique, and electrochemical impedance spectra. It is demonstrated that Na⁺ diffusion in Co-NiSe₂/C is a dynamic change process and is accompanied by a phase transition during the discharge/charge processes.

中文翻译：

二维栅栏状共掺杂NiSe2 / C纳米片作为半/全钠离子电池的阳极

二维栅栏状共掺杂NiSe ₂ / C（Co-NiSe ₂ / C）纳米片是通过一种容易的溶剂热方法，然后采用硒化策略制备的。Co-NiSe ₂ / C纳米片由交错的纳米棒组成，它们由尺寸为20 nm的小纳米粒子组成。这些小的纳米颗粒的表面覆盖着薄碳层。该材料显示优异的长期循环寿命（306.1毫安汞柱^-1 5000次循环后，在5 A G ^-1），倍率性能（260.1毫安汞柱^-1以10 A G ^-1），和全电池性能（269.1毫安汞柱^-1在0.5 A克100次循环后^-1）作为SIB的阳极。此外，基于异位X射线衍射分析，循环伏安法测量，恒电流间歇滴定技术和电化学阻抗谱，讨论了Na的储存机理和反应动力学。已经证明，Na ⁺在Co-NiSe ₂ / C中的扩散是一个动态变化过程，并且在放电/充电过程中伴随有相变。

更新日期：2020-11-06

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