Disclosed herein are methods for making a solid lithium ion electrolyte membrane, the methods comprising combining a first reactant chosen from amorphous, glassy, or low melting temperature solid reactants with a second reactant chosen from refractory oxides to form a mixture; heating the mixture to a first temperature to form a homogenized composite, wherein the first temperature is between a glass transition temperature of the first reactant and a crystallization onset temperature of the mixture; milling the homogenized composite to form homogenized particles; casting the homogenized particles to form a green body; and sintering the green body at a second temperature to form a solid membrane. Solid lithium ion electrolyte membranes manufactured according to these methods are also disclosed herein.
GOVERNMENT LICENSE RIGHTS
 This invention was made with government support under PRIME AWARD number DE-EE-0005757, whereby Corning Incorporated performs under subcontract award number PPBC-CORNING IMI 10-2012, awarded by the Department of Energy. The government has certain rights to this invention.