Novel high dielectric polymer composites with BaTiO3 co-doped by Nb2O5 and Co3O4

BaTiO3 (BT) and BaTiO3 modified with Nb2O5 and Co3O4 ([email protected]) were used as fillers and polyvinylidene fluoride (PVDF) as matrix to prepare BT/PVDF composites and [email protected]/PVDF composites, respectively. Microstructure, phase composition, dielectric properties and breakdown strength were investigated. 50 vol% [email protected]/PVDF composite exhibits high dielectric constant of 70.2 (at 104 Hz) and low dielectric loss of 0.02. It also possesses energy storage density of 0.7 J/cm3 at 47.2 kV/mm, which is 123.2 % higher than that of 50 vol% BT/PVDF composite. Therefore, modification of BT can be a good approach to increase dielectric response and enhance energy storage of [email protected]/PVDF composites.