Preparation, Structure Design And Energy Storage Performance Of Polymer-rare Earth Doped Barium Titanate Particle Composite Film

In order to prepare dielectric energy storage materials with low loss,high breakdown field strength and high energy storage,Nd-BaTiO₃@Al₂O₃?NBT@AO?particles were prepared.By investigating different solution temperatures and annealing temperatures,it was found that the NBT@AO particles prepared at 70°C solution temperature and 300°C annealing temperature showed good morphology and dispersibility.Nd-BaTiO₃@Al₂O₃@Dopamine?NBT@AO@PDA?particles were further prepared.The two kinds of particles were composited with PVDF by casting method.The phase structure and morphology of the composite film were characterized.The effects of particles on the dielectric properties,breakdown properties and energy storage properties of the composite film were investigated.NBT@AO particles had no effect on the phase structure of PVDF.A small amount of NBT@AO particles dispersed well in the composites,but the dispersion in the PVDF matrix deteriorated with the increase of the particle filling ratio.The dielectric properties of 1⁴ vol%PVDF/NBT@AO composite were investigated.The results show that NBT@AO particles can increase the dielectric constant of the composite membrane,and NBT@AO particles can inhibit the dielectric loss in small additions.Under the electric field of 412 kV/mm,the PVDF/NBT@AO composite film with a filling ratio of 1 vol%has a releasable energy storage density of 8.58 J/cm³ and a storage efficiency of 59%.The PVDF/NBT@AO@PDA particles have a close combination with PVDF,and the particles had no effect on the phase structure of the composites.NBT@AO@PDA particles can inhibit the dielectric loss of the composite membrane at a small filling ratio.The optimal performance is in the volume fraction of 1 vol%:at an electric field strength of 472 kV/mm,the discharged energy storage density of 1 vol%PVDF@AO@PDA reaches 10.9 J/cm³.And the energy storage efficiency is 65%.,which is 6%higher than that of the composite without dopamine.