Litchi-like Sn-MOF derived SnS2@SC composite as an advanced anode material for Lithium-Ion batteries

Abstract

Tin-based metal materials are promising anode candidates for lithium-ion batteries due to their high theoretical capacity. However, their practical application is constrained by significant volume expansion, structural degradation, and slow electron transfer kinetics. In this study, a lyotropic Sn-MOF was synthesized using tin sulfate and terephthalic acid as the tin source and organic ligand. The lychee-like Sn-MOF was then utilized as a precursor to prepare a hollow porous SnS₂@SC composite containing S-doped carbon through a hydrothermal method. The SnS₂@SC composite features nanoflower-like SnS₂ embedded in a carbon skeleton, which increases the specific surface area, while the hollow structure derived from the Sn-MOF provides an efficient conductive network and buffer space to enhance electrochemical performance. As a result, the SnS₂@SC electrode exhibits an impressive initial discharge capacity of 1062.9 mAh g⁻¹ at 0.1 A g^-1 and excellent long-term cycling stability, retaining 689.5 mAh g⁻¹ at 2.0 A g^-1 after prolonged cycling. This study offers a viable strategy for the rational design of bimetallic sulfide heterostructures and provides insights into the development of advanced electrochemical applications.