Recent advances in doping Na3Zr2Si2PO12 (NASICON) solid-state electrolyte for sodium-ion batteries

NASICON (sodium superionic conductor, Na3Zr2Si2PO12) is a promising electrolyte material for sodium-ion batteries due to its high ionic conductivity and excellent stability. Its inherent conductivity can be enhanced by doping, through which foreign atoms are introduced into the crystal lattice to modify the crystal structure and thus improve the material's overall sodium ionic conductivity. This enhancement is crucial for optimizing the performance and efficiency of sodium-ion batteries. This article reviews the recent advancements in NASICON doping, with a focus on doping strategies, the categories of dopants, the methods in relation to the synthesis, and the impacts of doping on the sodium-ion battery performance. In addition to highlighting the key achievements in NASICON doping, this review also briefly outlines the challenges encountered in the field. [Display omitted] •Doping proves to be effective in enhancing the ionic conductivity of NASICON electrolytes.•Doping with transition metals has been extensively studied in NASICON, achieving sodium ionic conductivity up to 10−3 S/cm.•Doping enhances NASICON's conductivity by forming lattice defects, ion-conductive phases, and optimal crystal structure.•Doping also enhances electrochemical stability of NASICON, leading to an improvement in the overall performance of battery.