A Facile Microwave Hydrothermal Method for Fabricating SnO@C/Graphene Composite With Enhanced Lithium Ion Storage Properties.

SnO@C/graphene ternary composite material has been prepared via a double-layer modified strategy of carbon layer and graphene sheets. The size, dispersity, and coating layer of SnO@C are uniform. The SnO@C/graphene has a typical porous structure. The discharge and charge capacities of the initial cycle for SnO@C/graphene are 2,210 mAh g and 1,285 mAh g, respectively, at a current density of 1,000 mA g. The Coulombic efficiency is 58.60%. The reversible specific capacity of the SnO@C/graphene anode is 955 mAh g after 300 cycles. The average reversible specific capacity still maintains 572 mAh g even at the high current density of 5 A g. In addition, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are performed to further investigate the prepared SnO@C/graphene composite material by a microwave hydrothermal method. As a result, SnO@C/graphene has demonstrated a better electrochemical performance.