Construction of Sb2S3@SnS@C Tubular Heterostructures as High-Performance Anode Materials for Sodium-Ion Batteries

SnS has been studied widely and deeply as a promising anode material for sodium-ion batteries. However, the large volume expansion, the great structural pulverization, and the slow electronic transmission have been the foremost obstacles to their further applications. Here, Sb2S3@SnS@C nanocomposites with a hollow-tube-heterostructure were constructured to mitigate the above problems. As the anode materials, the Sb2S3@SnS@C nanocomposites can deliver a high capacity of 442 mA h g(-1) after 200 cycles at 1 A g(-1) and excellent rate capacity of 448 mA h g(-1) at 5.0 A g(-1). Besides, a capacity of 200 mA h g(-1) could be detected with a superior cycling performance of 1300 cycles at 5.0 A g(-1). The outstanding cycle stability could be ascribed to the inner hollow tube structure and the protection of the outer carbon layer, which together maintain the stability of the structure jointly. Moreover, the internal electric field generated by the heterojunction of Sb2S3 and SnS promotes the electronic transmission and ion diffusion, resulting in good electrochemical performances.

Automated summary

The Sb2S3@SnS@C nanocomposites with a hollow-tube-heterostructure show improved performance for sodium-ion batteries, including cycling stability and rate capacity.