Constructing Three-Dimensional Porous SnS2/RGO as Superior-Rate and Long-Life Anodes for Lithium-Ion Batteries

Tin-based sulfides, possessing a unique layered structure and a high theoretical capacity, stand as highly prospective contenders for anode materials in lithium-ion batteries (LIBs). Nevertheless, the pronounced volume expansion that occurs during lithium storage and poor capacity retention have limited its progress toward commercialization. Herein, we designed and prepared a SnS2/RGO composite with a three-dimensional porous structure by sulfurizing the Sn6O4(OH)4/GO precursor. Through the integration of the structural architecture during the solvent reaction process and the nanomodification during the vulcanization process, the prepared SnS2/RGO composite has a porous structure, and the particle size is optimized at 2-5 nm. This structure is conducive to improving the conductivity of electrode materials, increasing reaction active sites, and enhancing the structural stability of electrode materials. Consequently, the synthesized SnS2/RGO composite is capable of retaining reversible capacities of 975 and 592 mA h g-1 after 250 cycles at 1.0 and 2.0 A g-1, respectively. Moreover, it exhibits a capacity of 349 mA h g-1 after 1100 cycles at 5.0 A g-1. This efficient and convenient preparation method provides guidance for enhancing the lithium storage properties of tin-based sulfides.