Three-dimensional structure S-SnS2/NSG with sulfur vacancies for high-performance lithium-ion batteries

In this contribution, a new three-dimensional (3D) structure of SnS2 with sulfur vacancies (S-SnS2)anchored on the surface of reduced graphene oxide (rGO) was synthesized via a facile solvothermal method. It was found that the addition of glycolic acid promoted the bonding of SnS2 with rGO, and enabling SnS2 to generate sulfur vacancies. As a result, the obtained unique 3D structure facilitated the rapid diffusion of lithium-ion and the S/N-doped rGO (NSG) enhanced the electronic conductivity of the S-SnS2/NSG. In detail, the S-SnS2/NSG as an anode in lithium-ion battery displayed a significant capacity of 1030.2 mA h g-1 at 0.5 A g-1 after 200 cycles. Even at a large current density of 5 A g-1, the S-SnS2/NSG retained an unsurpassed capacity of 790 mA h g-1 after 1000 cycles, demonstrating an ultrastable long cycling performance.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

A three-dimensional (3D) structure of SnS2 with sulfur vacancies (S-SnS2) anchored on the surface of reduced graphene oxide (rGO) was synthesized. The addition of glycolic acid promoted the bonding of SnS2 with rGO and enabled the generation of sulfur vacancies. The unique 3D structure facilitated lithium-ion diffusion and the S/N-doped rGO (NSG) enhanced the electronic conductivity of the S-SnS2/NSG. As a result, the S-SnS2/NSG exhibited a high capacity and ultrastable long cycling performance in lithium-ion batteries.