Rational Design of Core-Shell Structured C@SnO2@CNTs Composite with Enhanced Lithium Storage Performance

摘要

SnO2 is considered to be a potential anode material in lithium-ion batteries (LIBs) owing to its high specific capacity of 1494 mAh g(-1). Herein, we reported the unique core-shell structured C@SnO2@CNTs composite with controllable outer carbon thickness, which was synthesized by a simple hydrothermal method and subsequent annealing process. Results show that the C@SnO2@CNTs with outer carbon layer around 1.8 nm displays high reversible capacity and long-term cycling performance. It maintains a capacity of 850 mAh g(-1) should be at current density of 200 mA g(-1) up to 100 cycles. Further analysis found that the C@SnO2@CNTs composite exhibits excellent structural stability even after 100 cycles, which contributes to provide a highway for charge transmission. These results give rise to superior electrochemical performance of C@SnO2@CNTs composite and provide new insight for design metal oxide composite anode materials in LIBs field.