Ionically Conducting Composite Membranes from the Li2O?Al2O3?TiO2?P2O5Glass?Ceramic (original) (raw)

This paper reports processing of lithium ion-conducting, composite membranes comprised of 14Li 2 O. 9Al 2 O 3. 38 TiO 2. 39P 2 O 5 glass-ceramic and polyethylene. The processing involved tape casting of 14Li 2 O. 9Al 2 O 3. 38TiO 2. 39P 2 O 5 glass powder with organic additives into tapes, subjecting the green tape to binder burnout and thermal soaking in the temperature range of 9501-11001C, and finally infiltrating the porous tape with polyethylene solution. The ionic conductivity and microstructure of 150-350 lm thick membranes were characterized and are discussed in this paper. The crystallites of the glass-ceramic show liquid-like conductivity at ambient temperature, whereas the grain boundary conductivity is lower by a factor of five. The lower grain boundary conductivity is explained on the basis of crystallographic mismatch and the existence of AlPO 4 at the grain boundary. The polyethylene infiltration in the porous membrane improved mechanical resilience with a minor adverse effect on conductivity.