Consequently, benefited from high E b of 4570 kV/cm, low D r of 0.89 μC/cm 2 and large D max- D r of 4.75 μC/cm 2, the bilayer nanocomposite exhibits not only a large charge-discharge efficiency of 73%, but also an ultra-high discharged energy density of 10.27 J/cm 3 at 150 oC, which far better than those of recently reported polymer composites. Large dielectric difference of /PEI and Al 2O 3/PEI layers causes the reapportionment of the applied electric field at the interfaces of adjacent layers, which inhibits growth of electrical trees and reduces electrical conduction loss, thus resulting in improved E b. Bilayer-structured configurations combine advantages of orthorhombic PLZST AFEs with large maximum electric displacement ( D max) and low remnant electric displacement ( D r) at elevated temperature, and Al 2O 3 with high thermal conductivity, which can make nanocomposites possess narrow high-temperature electric displacement-electric field loops. 97La 0.02)(Zr 0.93Sn 0.03Ti 0.04)O 3 (PLZST) antiferroelectrics (DA)/polyetherimide (PEI)-Al 2O 3/PEI bilayer nanocomposites. Here, we have designed and developed (Pb_(0). Dielectric polymers are good candidates for electrostatic energy storage due to their large breakdown strength ( E b) and high reliability, but they cannot be capable of working efficiently at high temperature.
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