Green one-step synthesis of SnS2 quantum dots/S-doped reduced graphene oxide composite for superior lithium storage

Abstract

SnS2 has been considered as one of the most potential anode materials for lithium storage due to its high theoretical capacity. However, the SnS2-based electrodes still suffer from unsatisfied electrochemical lithium-storage performance due to the intrinsic poor conductivity, large volume change during cycles, and great irreversibility of the initial conversion reactions. Herein, SnS2 quantum dots (QDs) are uniform fixed in S-doped reduced graphene oxide (rGO) nanosheets or nanoscrolls by a simple green one-step hydrothermal method, which deliver superior lithium-storage performance, such as a high initial reversible capacity of 1151 mA h g−1 at a current density of 200 mA g−1, high capacity retention of 87.7% after 300 cycles at 500 mA g−1, and superior rate capacity of 314 mA h g−1 at 5000 mA g−1.