Water-stable lithium anode with Li1.4Al0.4Ge1.6(PO4)3-TiO2 sheet prepared by tape casting method for lithium-air batteries

A Li1.4Al0.4Ge1.6(PO4)(3) (LAGP) sheet was prepared using a tape casting method with a fine LAGP power prepared from a sol-gel precursor. The addition of nanosize TiO2 as a sintering additive was effective to enhance the ionic conductivity of the tape-cast sheet. The highest electrical conductivity of 837 x 10(-4) S cm(-1) was observed for the tape-cast LAGP sheet with 5 wt% TiO2 at 25 inverted perpendicular C. A hybrid sheet of the tape-cast LAGP and epoxy resin was water impermeable. The electrical conductivity of the water impermeable hybrid sheet with ca. 4% epoxy resin was 4.19 x 10(-4)S cm(-1) at 25 degrees C. The three-point bending strength of the LAGP-5 wt%TiO2-epoxy resin hybrid sheet was 111 N mm(-2), which is comparable with a Li1+x+yAlxTi2-xP3-ySiyO glass ceramic plate. The Li/PEO18(CF3SO2)(2)N/LAGP-5 wt.% TiO2 epoxy sheet was successfully operated as a lithium electrode in saturated LiCl aqueous solution. (C) 2013 Elsevier B.V. All rights reserved.