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 SnO -SnS heterostructure nanocrystals with oxygen/sulfur vacancies (V /V ) anchored on a 2D sulfur/nitrogen-doped reduced graphene oxide matrix (F-SnO -SnS @N/S-RGO). Consequently, the F-SnO -SnS @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 for Li and 296 mAh g at 5 A g for Na . The enhanced Li/Na storage properties of the nanocomposites are not only attributed to the increase in conductivity caused by V /V and F doping (confirmed by DFT calculations) to accelerate their charge-transfer kinetics but also the increased interaction between F-SnO -SnS and Li/Na through heterostructure. Meanwhile, the hierarchical F-SnO -SnS @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.

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http://dx.doi.org/10.1002/chem.202101561DOI Listing

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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 SnO -SnS heterostructure nanocrystals with oxygen/sulfur vacancies (V /V ) anchored on a 2D sulfur/nitrogen-doped reduced graphene oxide matrix (F-SnO -SnS @N/S-RGO). Consequently, the F-SnO -SnS @N/S-RGO anode demonstrates superb high reversible capacity and long-term cycling stability.

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