, Volume 45, Issue 14, pp 3954-3956
Date: 27 Apr 2010

Stability predictions of solid Li-ion conducting membranes in aqueous solutions

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Recently, there has been interest in the development of Li–Air batteries for high energy applications. One configuration involves the use of a Li anode in a non-aqueous electrolyte which is separated from an aqueous electrolyte containing the air cathode by a solid state Li-ion conducting membrane [1, 2]. One of the major requirements for the membrane material besides high Li-ion conductivity is water stability. Currently the Li-ion conducting membrane of choice is based on the NASICON structure of the type Li1+xMxTi2−x(PO4)3 (M = Al, Sc, Y, La) with x ~ 0.3 [36]. The composition of choice for the membrane is Li1+x+yAlxTi2−xSiyP3−yO12 [LATP] with x ~ 0.3 and y ~ 0.2 [37]. The LATP membrane is usually formed by a glass–ceramic processing technique. Silicon is added to improve the fluidity and thermal stability of the melt [3, 7]. The chemical stability of LATP supplied by Ohara Inc., Japan as a function of pH has been investigated by Hasegawa et al. [6]. They observed there was no sig