Carbon‐Sheathed MoS2 Nanothorns Epitaxially Grown on CNTs: Electrochemical Application for Highly Stable and Ultrafast Lithium Storage,Advanced Energy Materials

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Carbon‐Sheathed MoS2 Nanothorns Epitaxially Grown on CNTs: Electrochemical Application for Highly Stable and Ultrafast Lithium Storage
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-11-28 , DOI: 10.1002/aenm.201700174
Zijia Zhang ₁ , Hailei Zhao _{1,

2} , Yongqiang Teng ₁ , Xiwang Chang ₁ , Qing Xia ₁ , Zhaolin Li ₁ , Jiejun Fang ₁ , Zhihong Du ₁ , Konrad Świerczek _{3,

4}

Affiliation

Molybdenum disulfide (MoS₂), which possesses a layered structure and exhibits a high theoretical capacity, is currently under intensive research as an anode candidate for next generation of Li‐ion batteries. However, unmodified MoS₂ suffers from a poor cycling stability and an inferior rate capability upon charge/discharge processes. Herein, a unique nanocomposite comprising MoS₂ nanothorns epitaxially grown on the backbone of carbon nanotubes (CNTs) and coated by a layer of amorphous carbon is synthesized via a simple method. The epitaxial growth of MoS₂ on CNTs results in a strong chemical coupling between active nanothorns and carbon substrate via CS bond, providing a high stability as well as a high‐efficiency electron‐conduction/ion‐transportation system on cycling. The outer carbon layer can well‐accommodate the structural strain in the electrode upon lithium‐ion insertion/extraction. When employed as an anode for lithium storage, the prepared material exhibits remarkable electrochemical properties with a high specific capacity of 982 mA h g⁻¹ at 0.1 A g⁻¹, as well as excellent long‐cycling stability (905 mA h g⁻¹ at 1 A g⁻¹ after 500 cycles) and superior rate capability, confirming its potential application in high‐performance Li‐ion batteries.

中文翻译：

在碳纳米管上外延生长的带碳鞘的MoS2纳米刺：高度稳定和超快锂存储的电化学应用

二硫化钼（MoS ₂）具有层状结构并具有较高的理论容量，目前正作为下一代锂离子电池的负极候选材料进行深入研究。但是，未改性的MoS _2的循环稳定性差，并且在充电/放电过程中速率速率能力较差。在此，通过简单的方法合成了独特的纳米复合材料，该复合材料包括外延生长在碳纳米管（CNT）的骨架上并被无定形碳层覆盖的MoS ₂纳米刺。硫化钼的外延生长₂上的CNT的结果通过C活性nanothorns和碳基板之间的强烈化学偶联S键，在循环时提供了高稳定性以及高效的电子传导/离子传输系统。锂离子插入/拔出时，外部碳层可以很好地适应电极中的结构应变。当用作用于锂存储的阳极，与982毫安Hg的高比容量所制备的材料表现出显着的电化学性能^-1 0.1 A G ^-1，以及优异的长期循环稳定性（905毫安汞柱^-1 1 500次循环后的g ^-1）和出色的倍率性能，证实了其在高性能锂离子电池中的潜在应用。

更新日期：2017-11-28

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