In-situ growth engineering of nano-sheets SnS2 on S-doped reduced graphene oxide for high lithium/sodium storage capacity

The two-dimensional layered tin disulfide (SnS2) has aroused extensive attention in both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) since its satisfactory theoretical capacity. Herein, the anode material comprised of SnS2 nanosheets grown in-situ on S-doped reduced graphene oxide sheets (SnS2/S-rGO) was successfully prepared via a one-step hydrothermal method. SnS2 nanosheets are covalently linked to rGO by a CS bond, this special structure endows outstanding electrochemical performance for SnS2/S-rGO electrode. At 0.1 A g−1, it delivers a specific capacity of 1641.9 mAh g−1 and 610.5 mAh g−1 for lithium and sodium storage, respectively. Furthermore, the electrode can also maintain 1776.4 mAh g−1 even after 200 cycles exhibiting a splendid long cycle performance at 1 A g−1 for LIBs. Obviously, the structural design of the SnS2/S-rGO composite show advantages in lithium/sodium storage performance.