Homogeneous hybridization of NASICON-type cathode for enhanced sodium-ion storage

Na3V2(PO4)3 has attracted intensive interest as cathode materials of sodium-ion batteries (SIBs), whereas, its performance is hindered by the sluggish Na-ion diffusion. Herein, with delicate reaction-component regulation and ideal paired Na7V4(P2O7)4PO4, homogeneous hybridized Na3V2(PO4)3-based cathode (denoted as HNVP) is designed to fully unleash the biphase synergy and trigger the ultra-fast kinetics in the SIBs. The dynamics of HNVP can be largely motivated by the intimate interaction via homogeneous hybridized Na3V2(PO4)3 and Na7V4(P2O7)4PO4, the intermediate state of Na7V4(P2O7)4PO4 and the in-situ constructed expressway of amorphous crystal boundaries, all of which enable ultra-high rate capability up to 50C and applicable area loading of 48.85 mg cm−2; while the reinforced structural of HNVP enables record-low capacity decay of 0.0051% per cycle over 2100 cycles. Moreover, under the guidance of phase diagrams, the homogeneous hybridization strategy can be further promoted to various types of advanced composite cathodes for intrinsic innovations.