▎ 摘　　要

Phase engineering of the electrode materials in terms of designing heterostructures, introducing heteroatom and defects, improves great prospects in accelerating the charge storage kinetics during the repeated Li+/Na+ insertion/deintercalation. Herein, a new design of Li/Na-ion battery anodes through phase regulating is reported consisting of F-doped SnO2-SnS2 heterostructure nanocrystals with oxygen/sulfur vacancies (V-O/V-S) anchored on a 2D sulfur/nitrogen-doped reduced graphene oxide matrix (F-SnO2-x-SnS2-x@N/S-RGO). Consequently, the F-SnO2-x-SnS2-x@N/S-RGO anode demonstrates superb high reversible capacity and long-term cycling stability. Moreover, it exhibits excellent great rate capability with 589 mAh g(-1) for Li+ and 296 mAh g(-1) at 5 A g(-1) for Na+. The enhanced Li/Na storage properties of the nanocomposites are not only attributed to the increase in conductivity caused by V-O/V-S and F doping (confirmed by DFT calculations) to accelerate their charge-transfer kinetics but also the increased interaction between F-SnO2-x-SnS2-x and Li/Na through heterostructure. Meanwhile, the hierarchical F-SnO2-x-SnS2-x@N/S-RGO network structure enables fast infiltration of electrolyte and improves electron/ion transportation in the electrode, and the corrosion resistance of F doping contributes to prolonged cycle stability.