Simple self-assembly of SnS2 entrapped graphene aerogel and its enhanced lithium storage performance

Abstract

In this work, SnS2 nanoplates entrapped graphene aerogel has been successfully prepared by simple self-assembly of reduced graphene oxide obtained through mild chemical reduction. Structural and morphological investigations demonstrated that SnS2 nanoplates are highly dispersed in the three dimensional (3D) porous graphene matrix. When served as anode material for lithium-ion batteries, the electrochemical properties of SnS2/graphene aerogel (SnS2/GA) were evaluated by galvanostatic discharge–charge tests, cyclic voltammetry and impedance spectroscopy measurement. Compared with pristine SnS2, the SnS2/GA nanocomposite achieved a much higher initial reversible capacity (1186mAhg−1), superior cyclic stability (1004mAhg−1 after 60 cycles, corresponding to 84.7% of the initial reversible capacity), as well as better rate capability (650mAhg−1 at a current density of 1000mAg−1). This significantly improved lithium storage performance can be attributed to the good integration of SnS2 nanoplates with 3D porous graphene network, which can not only provide much more active sites and easy access for Li ions intercalation, but also prevent the aggregation of SnS2 nanoplates and facilitate fast transportation of Li ions and surface electrons during the electrochemical process.