Interfacial modification of Na 3 Zr 2 Si 2 PO 12 solid electrolyte by femtosecond laser etching

All-solid-state Na battery is one of the most promising batteries because it can solve safety and cost issues of current Li battery simultaneously. In the all-solid-state battery, the interface quality between electrodes and solid-state electrolytes is still one of the critical issues. In this work, surface texturing of Na 3 Zr 2 Si 2 PO 12 (NZSP) solid electrolyte is studied. Surface texturing is prepared by the femtosecond laser etching. By the laser etching, periodic surface ditches with 15 μm of width is successfully prepared. Impurity formation is not confirmed after the etching, implying that the laser etching would not affect crystal structure of NZSP. All-solid-state Na battery is constructed by using etched NZSP, NaMnO 2 cathode, and Na metal anode. The all-solid-state Na battery works 50 cycles stably. The improvement of performance could be achieved by optimization of the surface texture.