Artificial porous heterogeneous interface for all-solid-state sodium ion battery

Solid sodium-ion batteries are regarded as promising candidates for next-generation energy storage sys-tems with high energy density and good safety. However, the large interface resistance and dendrite growth between sodium and solid electrolytes, especially at high current densities, severely limits their development. Herein, an artificial porous heterogeneous interface is constructed between sodium and the NASICON electrolyte Na3Hf2Si2PO12 (NHSP). This indicated that the porous heterogeneous interface with high-efficiency ion-electron transfer properties could effectively reduce the interface resistance, inhibit dendrites, and realize good rate performance. The symmetric cell with porous heterogeneous interface could cycle stably for more than 2000 h at 0.2 mA cm' at room temperature, and the critical current den-sity reached 2.7 mA cm-2. Our study provides a promising direction for creating a stable interface that meets both the long-cycle and high-rate requirements for all-solid-state sodium-ion batteries.