Tin-based alloy anodes exhibit high theoretical capacity for lithium-ion batteries but suffer from substantial volume expansion, structural degradation, and sluggish kinetics. However, the large volume expansion, crushed structure, and slow electron transport rate of the metal anode are the main obstacles to its further application. In this study, we adopt a strategy to alleviate the above problems by using Sn-MOF as a precursor and prepare S, Se codoped hollow porous carbon microspheres coated with heterojunction-structured SnS2/SnSe@HCMs through one-step sulfurization and selenization. The SnS2/SnSe@HCMs heterojunction creates a built-in electric field that enhances carrier separation and conductivity. Simultaneously, the Sn-MOF-derived hollow carbon microspheres provide conductive networks and buffer spaces, synergistically boosting electrochemical performance. Thanks to these advantages, the obtained SnS2/SnSe@HCMs electrode has an impressive initial discharge capacity (2012.5 mA h g–1 at 0.1 A g–1), and after 500 cycles, the SnS2/SnSe@HCMs electrode maintains a reversible capacity of 854.6 mA h g–1, demonstrating excellent long-term cycling stability. The present work provides a feasible solution for the rational design of heterostructures of sulfides and promotes the development of other electrochemical applications.
Zhou et al. (2025) studied this question.