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 / FeS ₂@SnS ₂ / 1D/2D / capacitance behavior

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