Water-Insoluble Lanthanum Oxychloride-Based Solid Electrolytes with Ultra-High Chloride Ion Conductivity

Calcium doping levels of up to 20 % can be achieved for the La1−xCaxOCl1−x solid solution series. At the highest doping levels (x=0.2; see graph (•)), the conductivity of the solid solution is three orders of magnitude greater than that of undoped LaOCl (□). The potential for the design of new functional materials stems from their high thermal stability, relative density, and hardness, in addition to their insolublity in water.