Boosting the stable sodium-ion storage performance by tailoring the 1D TiO2@ReS2 core-shell heterostructures
Boosting the stable sodium-ion storage performance by tailoring the 1D TiO2@ReS2 core-shell heterostructures
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通过定制一维TiO2@ReS2核壳异质结构提高稳定的钠离子存储性能
DOI：
10.1016/j.electacta.2020.135695
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发表时间：
2020-04
影响因子：
6.6
通讯作者：
Fang He
中科院分区：
文献类型：
--
作者：
Xinqian Wang;Biao Chen;Jing Mao;Junwei Sha;Liying Ma;Naiqin Zhao;Fang He
ReS 2被认为是一种新兴的钠离子电池过渡金属二硫属化物（TMD）材料。然而，在深充放电过程中，其结构聚集和损伤严重限制了其电化学性能。在这里，一个新的一维TiO2@ReS2核壳结构的报道，以提高稳定的性能，因为TiO 2具有持久的结构稳定性。表面粗糙、比表面积大的一维TiO 2纳米管有利于在其表面生长少层（≤4层）的ReS 2纳米片。在所获得的1D TiO 2 nanotube@ReS2 nanosheet（1D TiO 2-NT@ReS2-NS）核壳异质结构中，暴露的ReS 2 nanosheet为快速Na+扩散提供了高接触面积，而TiO 2 nanotube@ReS2 nanosheet作为鲁棒的骨架用于适应体积变化和应变。此外，TiO 2和ReS 2之间的化学界面相互作用产生了有利的协同效应，导致增强的电导率，Na+扩散动力学，和结构稳定性在电极和材料水平。这些发现可以支持各种表征技术，如X射线光电子能谱和高分辨率透射电子显微镜。结果，1D TiO 2-NT@ReS2-NS电极在钠离子电池中1000次循环后显示出118 mAh g− 1（1 A g− 1）的理想长寿命循环性能。本工作不仅报道了一种稳定的SIB负极材料，而且为碱金属离子电池电极材料的设计和制备提供了基础知识。
ReS2has been considered as an emerging transition metal dichalcogenides (TMDs) material for sodium-ion batteries (SIBs). However, its electrochemical performance is severely limited by the structural aggregation and damage during deep charge-discharge. Here, a new 1D TiO2@ReS2core-shell structure is reported for boosting the stable performance as the TiO2has durable structural stability. The 1D TiO2nanotubes with rough surface and large surface area are helpful to grow few-layer (≤4 layers) ReS2nanosheets onto their surface. In the obtained 1D TiO2nanotube@ReS2nanosheet (1D TiO2-NT@ReS2-NS) core-shell heterostructures, the exposed ultrathin ReS2nanosheets offer high contact area for rapid Na+diffusion, whilst the TiO2nanotubes work as robust backbone for accommodating volume change and strain. Moreover, the chemical interfacial interaction between TiO2and ReS2gives rise to favorable synergistic effect, leading to enhanced electrical conductivity, Na+diffusion kinetics, and structural stability at both electrode and materials levels. These findings can be supported by various characterization technologies such as X-ray photoelectron spectrum and high-resolution transmission electron microscopy. As a result, the 1D TiO2-NT@ReS2-NS electrode displays a desirable long-life span cycling performance of 118 mAh g−1at 1 A g−1after 1000 cycles in sodium-ion batteries. This work not only reports a stable SIBs anode material, but also provides fundamental understanding for designing and fabricating electrode materials for alkali metal ion batteries.
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