▎ 摘　　要

Sn/graphene/polydopamine ternary nanocomposites have been synthesized through a facile precipitation method. Sn nanoparticles are closely wrapped by graphene in the nanocomposites as compared to Sn/graphene, which is beneficial not only to reduce the volumetric change but also to boost the conductivity of the nanocomposites. The lithium storage properties of the materials have been investigated by cyclic voltammetry measurements and charge/discharge cycling. The obtained Sn/graphene/polydopamine nanocomposites deliver a high capacity of 626mAhg(-1) after 200cycles at the current density of 500mAg(-1), which is superior to Sn/graphene. Electrochemical impedance spectroscopy measurements suggest that the introduction of polydopamine decreases the interface resistance of the composites and increases the conductivity of electrons efficiently.