Bimetallic sulfide FeS₂@SnS₂ as high-performance anodes for sodium-ion batteries

Abstract

A novel hierarchical structure of bimetal sulfide FeS₂@SnS₂ with the 1D/2D heterostructure was developed for high-performance sodium-ion batteries (SIBs). The FeS₂@SnS₂ was synthesized through a hydrothermal reaction and a sulphuration process. The exquisite 1D/2D heterostructure is featured with 2D SnS₂ nanoflakes anchoring on the 1D FeS₂ nanorod. This well-designed FeS₂@SnS₂ provides shortened ion diffusion pathway and adequate surface area, which facilitates the Na⁺ transport and capacitive Na⁺ storage. Besides, the FeS₂@SnS₂ integrates the 1D/2D synthetic structural advantages and synthetic hybrid active material. Consequently, the FeS₂@SnS₂ anode exhibits high initial specific capacity of 765.5 mAh·g⁻¹ at 1 A·g⁻¹ and outstanding reversibility (506.0 mAh·g⁻¹ at 1 A·g⁻¹ after 200 cycles, 262.5 mAh·g⁻¹ at 5 A·g⁻¹ after 1400 cycles). Moreover, the kinetic analysis reveals that the FeS₂@SnS₂ anode displays significant capacitive behavior which boosts the rate capacity.

Graphical abstract

Keywords

sodium-ion battery / FeS₂@SnS₂ / 1D/2D / capacitance behavior

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 21501101 and 52004100), the Natural Science Foundation of Henan Province (Grant No. 182300410226), and Nanyang Normal University (Grant No. 2022ZX007).

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