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Sodium-ion batteries (SIBs) have come up as an alternative to lithium-ion batteries (LIBs) for large-scale applications because of abundant Na storage in the earth’s crust. Antimony (Sb) hollow nanospheres (HNSs) obtained by galvanic replacement were first applied as anode materials for sodium-ion batteries and exhibited superior electrochemical performances with high reversible capacity of 622.2 mAh g^–1 at a current density of 50 mA g^–1 after 50 cycles, close to the theoretical capacity (660 mAh g^–1); even at high current density of 1600 mA g^–1, the reversible capacities can also reach 315 mAh g^–1. The benefits of this unique structure can also be extended to LIBs, resulting in reversible capacity of 627.3 mAh g^–1 at a current density of 100 mAh g^–1 after 50 cycles, and at high current density of 1600 mA g^–1, the reversible capacity is 435.6 mAhg^–1. Thus, these benefits from the Sb HNSs are able to provide a …