Porous Glass‐Ceramics with a Skeleton of the Fast‐Lithium‐Conducting Crystal Li 1+ x Ti 2− x Al x (PO 4 ) 3

Porous glass‐ceramics with a skeleton of the fast‐lithium‐conducting crystal Li 1+ x Ti 2− x Al x (PO 4 ) 3 (where x = 0.3–0.5) were prepared by crystallization of glasses in the Li 2 O─CaO─TiO 2 ─Al 2 O 3 –P 2 O 5 system and subsequent acid leaching of the resulting dense glass‐ceramics composed of the interlocking of Li 1+ x Ti 2− x Al x (PO 4 ) 3 and β‐Ca 3 (PO 4 ) 2 phases. The median pore diameter and surface area of the resulting porous Li 1+ x Ti 2− x Al x (PO 4 ) 3 glass‐ceramics were approximately 0.2 μm and 50 m 2 /g, respectively. The electrical conductivity of the porous glass‐ceramics after heating in LiNO 3 aqueous solution was 8 × 10 −5 S/cm at 300 K or 2 × 10 −2 S/cm at 600 K.