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 Fe_1−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 toward the next-generation high-performance energy storage devices.

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高速提高金属硫化物基负极材料的循环稳定性对先进的钠离子电池具有重要意义。但是，反应动力学迟缓是高性能钠存储电极发展的一大障碍。在这里，我们通过设计Fe _{1− x} S / MoS ₂合理地设计了异质界面通过一系列的原位和非原位电化学研究证明，这种异质结构具有丰富的“离子库”，使电极具有出色的循环稳定性和倍率性能。密度泛函理论计算进一步揭示，异质界面大大降低了钠离子扩散势垒，并促进了电荷转移动力学。我们目前的发现不仅对结构与性能之间的相关性进行了深入分析，而且还为下一代高性能储能设备的合理异质接口工程设计提供了灵感。

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