Three-dimensionally interconnected nickel-antimony intermetallic hollow nanospheres as anode material for high-rate sodium-ion batteries

3D interconnected NiSb intermetallic hollow nanospheres for Na-ion batteries are prepared by facile and low-temperature approach involving the crystallized 3D interconnected Ni nanospheres precursor and subsequent galvanic replacement reaction with Sb ions. The 3D interconnected hollow structure and Ni matrix encapsulation contribute significantly to the excellent structure stability and high electrochemical performance of the Sb-based anode.