▎ 摘　　要

SnO2/NiFe2O4/Graphene (SNG) nanocomposites have been fabricated by a one-step hydrothermal synthesis method for Lithium ion batteries. Due to the synergetic effect between graphene, NiFe2O4 and SnO2 nanoparticle, the nanocomposites show good electrochemical performance. It is found that the electrochemical performance was enhanced with increasing content of SnO2. Typically, the nanocomposite with 50 wt% SnO2 exhibits a high reversible capacity of 731.5 mA h/g at a current density of 200 mA/g after 50 cycles, which can remain 80.9% of the first cycle. The material also exhibits a relatively high discharge capacity of 613 mA h/g at 800 mA/g after 100 cycles. These improved electrochemical performances are attributed to the capacity of NiFe2O4/SnO2 and the SnO2 buffer layers impede the pulverization of electrode material during lithium insertion/extraction. Furthermore, graphene sheet can enhance electrical conductivity and accommodate the volume change in some extent, which can keep the structure integrate, and then improving the cycling stability and rate capability. (C) 2020 Published by Elsevier B.V.