FATO-based cathode composites were prepared by first ball milling La0.9Ba0.1F2.9 and La2(Ni/Co)O4 in a 2:1 ratio at 250 rpm for 2 hours using 10 pieces of 10 mm ZrO2 balls in a 50 ml ZrO2 jar in argon atmosphere. This powder was then added to a 100ml round bottom flask with 20ml of isopropanol, which was then sonicated in an ultrasonic bath for 10 minutes. To this flask, FATO nanoparticles in aqueous dispersion directly after sonication on a Hielscher 400S ultrasonic probe were added before the dispersants were removed using a rotary