A novel SnS2 nanomaterial based on nitrogen-doped cubic-like carbon skeleton with excellent lithium storage

SnS2 has been identified as an up-and-coming anode candidate for lithium-ion batteries (LIBs) with its high theoretical capacity. Nevertheless, the material's rate performance and stability properties during actual cycling are still constrained by the striking volume expansion and weak ions dynamics. Thus, we upgrade a novel nitrogen-doped strategy based on MOFs materials to solve the above problem. The nitrogen source is successfully introduced under vacuum conditions by using different N-containing organic ligands to replace the position of the solvent sites on the MOF clusters. Finally, the material was obtained by high-temperature vulcanization under vacuum conditions, which retained the like-hexahedral carbon skeleton of the precursor to suppress volume expansion effectively. The introduction of nitrogen not only enhances the mechanical capability of the carbon skeleton but also enhances the electrical conductivity of the material. The SnS2/C-NB composites exhibit excellent cycle stability (maintains 1080.1 mAh g(-1) for 200 cycles at 100 mA g(-1), which stays at 84.1%; maintains 660.2 mAh g(-1) for 200 cycles at 1000 mA g(-1), which stays at 82.5%) with the synergistic protection of nitrogen-doped/carbon-coated and shorter ions/electrons transfer channels. The present work provides a new idea for the preparation of nitrogen-doped materials to enhance the cycling stability and rate performance of LIBs. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study successfully enhanced the cycling stability and rate performance of SnS2 by upgrading a novel nitrogen-doped strategy, which improved the mechanical capability and electrical conductivity of the material through nitrogen doping, showing promising prospects for practical applications.