▎ 摘　　要

A facile strategy to improve the electrochemical performance of graphene and SnO2 hybrid (SnO2/GNSs) as anode for lithium-ion batteries through adding and removing of Al2O3 from the composite was introduced. Benefiting from the vacancy formed during the soaking in sodium hydroxide solution, the volume expansion of SnO2 was remitted. Meanwhile, the agglomeration of SnO2 was effectively alleviated. Therefore, a much better cyclic performance was achieved as compared to pristine composite. The modified composite (M-SnO2/GNSs) exhibited reversible capacities of 611 mAh g(-1) for the first charge and 436 mAh g(-1) after 50 cycles at 50 mA g(-1), respectively. The high capacity and good retention can be attributed to the synergistic effect between SnO2 and GNSs, including excellent conductivity of graphene and the vacancy formed after removing Al2O3, which could buffer the volume changes of SnO2 during cycling. This modification approach presented a promising route to design better anodes for high-performance Li-ion batteries.