Ultra-superior high-temperature energy storage properties in polymer nanocomposites via rational design of core–shell structured inorganic antiferroelectric fillers

Polyetherimide nanocomposites with core–shell structured (Pb, La)(Zr, Sn, Ti)O 3 @Al 2 O 3 antiferroelectric nanoparticle fillers deliver an ultra-high discharged energy density of 10.2 J cm −3 and a large efficiency of 83.5% at 150 °C.