A Facile Microwave Hydrothermal Method for Fabricating SnO(2)@C/Graphene Composite With Enhanced Lithium Ion Storage Properties

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