High current and dendrite-tolerant NaF/ZnO coated Na3Zr2Si2PO12 electrolyte prepared by a facile spraying method

Solid-state sodium metal batteries have attracted much attention due to the high energy density and safety. However, the poor physical contact and morphology instability at the anode interface decrease the dendrite tolerance of Na 3 Zr 2 Si 2 PO 12 at high current density . Herein, NaF/NaZn 13 multi-functional artificial layer is prepared by in-situ thermal decomposition and alloying reaction. The anode interface resistance is significantly decreased from 1258.5 to 41.5 Ω cm 2 due to the improved sodiophilic property. Moreover, the NaF/NaZn 13 interphase can promote the Na + diffusion and suppress the electron leakage at the interface, enabling a high critical current density of 2.4 mA cm −2 and a stable Na stripping/plating at 0.5 mA cm −2 for 500 h and 0.7 mA cm −2 for 200 h. The Na 3 V 2 (PO 4 ) 3 /Na all-solid-state battery shows excellent rate and cycling performance. This work proves the feasibility of fluorinated multifunctional interphase in realizing high current and dendrite tolerant solid-state electrolytes.