SnO2@C composite as Anode Material of Lithium-ion Batteries with Enhanced Cycling Stability

Abstract

The SnO2@C composite was prepared by a two-step microwave-hydrothermal method using a microwave reaction system. The surface of the carbon spheres is composited of the SnO2 nanoparticles with a diameter of about 3 nm. The SnO2@C composite exhibits excellent electrochemical performances in lithium-ion batteries. The first discharge/charge capacities at a current density of 700 and 1000 mAg-1 is 1393/766 and 1309/685 mAh.g-1 with coulomb efficiencies of 54.99% and 52.33%, respectively. Even after 100 cycles, the discharge specific capacities at a current density of 1000 mAg-1 remains 480 mAh.g-1 with coulomb efficiencies of 99.40%.