H+ diffusion and electrochemical stability of Li1+x+yAlxTi2−xSiyP3−yO12 glass in aqueous Li/air battery electrolytes

► H+-ion diffusion in LATP glass and the interactions with the glass surface were investigated. ► Protons can be adsorbed on the LATP glass surface but cannot go through the glass. ► The observed cathodic current is attributed to H+ adsorption/reaction on LATP. ► LATP glass surface will be seriously corroded in a strong alkaline electrolyte with time. ► Appropriate electrolytes are needed for long-term operation of aqueous Li-air batteries.