▎ 摘　　要

Owing to the higher theoretical specific capacity and particular stratification construction, SnS2 materials are regarded as a potential high specific capacity anode electrode, but also have problems such as large initial irreversible capacity, low conductivity, and large volume changes during charging/discharging. Recently, SnS2 quantum dots (SnS2 QDs) with ultra-small particle sizes offer a possibility for the practical application of alle-viating the volume expansion. Herein, the S, N-codoped three-dimensional porous graphene composites with ultra-small SnS2 particles (SnS2 QDs/SNG) by a simple one-step hydrothermal method using thiourea as sulfur source and reductant. The SnS2 QDs with a mean diameter of 2-3.5 nm can effectively short the ion channel and disperse the mechanical stress. In addition, the S, N-codoped graphene has a large specific surface area, which can alleviate the volume expansion. Profit from the 3D framework porous nanostructure, the resulting anode electrode shows a significant specific capacity and cycle stability of 1859.6 mAh g-1 after 100 cycles of 0.1A g-1, and still shows the capacity of 754.2 mAh g-1 after 1000 cycles of 0.5 A g-1. This unique structural design and features provide a valuable reference for further research on the composite of SnS2 nanoparticles with graphene as anode material.