▎ 摘　　要

The two-dimensional layered material tin disulfide (SnS2) has a high theoretical capacity for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) due to its combination of conversion and alloying reactions during the charge-storage process. However, the intrinsic poor conductivity and huge volume changes impede its practical applications. In this work, a design of in situ growth and polymerization is developed to synthesize polypyrrole wrapped SnS2 vertical nanosheet arrays grown on nitrogen-doped three-dimensional graphene (PPy@SnS2@N3DG). The PPy@SnS2@N3DG composite, with the unique free-standing hierarchical structure and the synergy of three components, exhibits excellent rate capability and superior cycling stability. Based on the features of high capacity, lightweight, and facile preparation, the PPy@SnS2@N3DG composite can be considered as a promising electrode for energy storage devices.