Formation of SnO‐based glassy anode for all‐solid‐state battery prepared by laser‐based powder bed fusion technique

Abstract In oxide‐based all‐solid‐state batteries, the grain boundaries impede ion conduction, necessitating materials and processes that facilitate interface formation for the development of high‐performance batteries. A new attempt to develop an oxide all‐solid‐state sodium‐ion battery involves applying glass‐ceramic melt‐solidification and laser powder bed melting to form an anode layer on a solid electrolyte. We applied tin‐iron‐sodium‐silicate glass as the anode electrode to a solid electrolyte consisting of Na 3 Zr 2 Si 2 PO 12 (NZSP) by screen printing and irradiated with a laser beam at a wavelength of λ  = 1064 nm, indicating densification of the anode layer and formation of a heterointerface with the solid electrolyte. In correlation with the energy density of the laser beam, the melt‐solidified layer of the anode active material formed a droplet‐like or well‐wetted interface with the NZSP. An all‐solid‐state sodium‐ion battery was operated with a hetero‐interface formed by laser irradiation at a laser power of 3 W and scanning speed of 100 mm/s. Laser irradiation is a promising process for forming electrode interfaces in all‐solid‐state batteries composed of glass‐ceramics with different thermal properties.