Ultradispersed nanoarchitecture of SnS nanoparticles/reduced graphene oxide for enhanced sodium storage performance

Abstract

SnSanodes for Na-ions (NIBs) batteries are known for theirs significantly high theoretical capacities involving conversion reactions and alloying/dealloying mechanisms. However, the large volume expansion of the SnS materials during electrode reactions and the lowelectrical conductivity could cause severe structural degradation and electrodes pulverization, consequently resulting in capacity fading. In this study, Ultradispersed nanoarchitecture of SnS nanoparticles/reduced graphene oxide (SnS/rGO) is prepared by the in situ growing SnS nanoparticles on the graphene followed by the thermal treatment. When served as the anode materials for NIBs, the SnS/rGO composites can deliver anexcellent reversible capacity of 559mAhg-1 at a current density of0.2Ag-1 after 70 cycles and an outstanding rate capability of 456mAhg-1 at a current density of 2Ag-1. The excellent electrochemical properties could be attributed to: (1) The structural merits of the ultradispersed SnS nanoparticles. (2) The synergistic effects between SnS nanoparticles and graphene.Which not only provides robust protection against the aggregation and volume changes of the SnSnanoparticles, but also ensures high transport kinetics for both electrons and Na ions. Therefore, the obtained ultradispersed nanoarchitecture of SnS nanoparticles/reduced graphene oxide composites possesses great potential as anode materials for NIBs.