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原位掺杂碳的 Mo(Se0.85 S0.15 )2 分级纳米管作为高性能钠离子电池的稳定阳极。

In Situ Carbon-Doped Mo(Se0.85 S0.15 )2 Hierarchical Nanotubes as Stable Anodes for High-Performance Sodium-Ion Batteries.

机构信息

School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, 230009, P. R. China.

Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, P. R. China.

出版信息

Small. 2015 Nov 11;11(42):5667-74. doi: 10.1002/smll.201501360. Epub 2015 Sep 9.

Abstract

Sodium-ion batteries (SIBs) are promising energy storage devices, but suffer from poor cycling stability and low rate capability. In this work, carbon doped Mo(Se0.85 S0.15 )2 (i.e., Mo(Se0.85 S0.15 )2 :C) hierarchical nanotubes have been synthesized for the first time and serve as a robust and high-performance anode material. The hierarchical nanotubes with diameters of 300 nm and wall thicknesses of 50 nm consist of numerous 2D layered nanosheets, and can act as a robust host for sodiation/desodiation cycling. The Mo(Se0.85 S0.15 )2 :C hierarchical nanotubes deliver a discharge capacity of 360 mAh g(-1) at a high current density of 2000 mA g(-1) and keep a 81.8% capacity retention compared to that at a current density of 50 mA g(-1) , showing superior rate capability. Comparing with the second cycle discharge capacities, the nanotube anode can maintain capacities of 102.2%, 101.9%, and 97.8% after 100 cycles at current densities of 200, 500, and 1000 mA g(-1) , respectively. This work demonstrates the best cycling performance and high-rate sodium storage capabilities of MoSe2 for SIBs to date. The hollow interior, hierarchical organization, layered structure, and carbon doping are beneficial for fast Na(+) -ion and electron kinetics and are responsible for the stable cycling performance and high rate capabilities.

摘要

钠离子电池(SIBs)是很有前途的储能设备,但存在循环稳定性差和倍率性能低的问题。在这项工作中,首次合成了掺碳 Mo(Se0.85 S0.15 )2 (即 Mo(Se0.85 S0.15 )2 :C)分级纳米管,用作一种稳定而高性能的阳极材料。这种具有 300nm 直径和 50nm 壁厚的分级纳米管由许多二维层状纳米片组成,可以作为一个稳定的主体来进行钠化/去钠化循环。Mo(Se0.85 S0.15 )2 :C 分级纳米管在 2000mA g-1 的高电流密度下的放电容量为 360mAh g-1 ,与 50mA g-1 的电流密度相比,容量保持率为 81.8%,表现出优异的倍率性能。与第二循环的放电容量相比,纳米管阳极在 200、500 和 1000mA g-1 的电流密度下循环 100 次后,容量分别保持为 102.2%、101.9%和 97.8%。这项工作展示了 MoSe2 作为 SIBs 迄今为止最好的循环性能和高倍率钠存储能力。空心内部、分级组织、层状结构和碳掺杂有利于快速的 Na(+) -离子和电子动力学,这是稳定的循环性能和高倍率能力的原因。

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