14November2019

Nano-Micro Letters

Boosting Sodium Storage of Fe1-xS/MoS2 Composite via Heterointerface Engineering

Song Chen1, 2, Shaozhuan Huang2, Junping Hu2, Shuang Fan1, 2, Yang Shang2, Mei Er Pam2, Xiaoxia Li2, Ye Wang4, Tingting Xu4, Yumeng Shi1, 3, *, Hui Ying Yang2, *

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Nano-Micro Lett. (2019) 11: 80

First Online: 23 September 2019 (Article)

DOI:10.1007/s40820-019-0311-z

*Corresponding author. E-mail: yanghuiying@sutd.edu.sg (Hui Ying Yang); yumeng_shi@163.com (Yumeng Shi)

 

Abstract

 


Toc

Improving the cycling stability of metal sulfide-based anode materials at high rate is of great significance for advanced sodium ion batteries. However, the sluggish reaction kinetics is a big obstacle for the development of high-performance sodium storage electrodes. Herein, we have rationally engineered the heterointerface by designing the Fe1-xS/MoS2 heterostructure with abundant “ion reservoir” to endow the electrode with excellent cycling stability and rate capability, which is proved by a series of in- and ex-situ electrochemical investigations. Density functional theory calculations further reveal that the heterointerface greatly decreases sodium ion diffusion barrier and facilitates charge transfer kinetics. Our present findings not only provide a deep analysis on the correlation between the structure and performance, but also draw inspiration for rational heterointerface engineering towards the next-generation high-performance energy storage devices.


 

Keywords

Heterostucture; Heterointerface; Diffusion barrier; Ion reservoir; Sodium ion battery

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