The Preparation Of Porous BATIO₃ And Its Application Research

In order to prepare BaTiO3/PVDF composites with higher dielectric properties and energy density, we prepared porous BaTiO3 nanoparticles. The conductor of Ni, Ag and C were loaded on porous BaTiO3 nanoparticles. The morphology of BaTiO3 nanoparticles and the dielectric properties and energy density of porous BaTiO3/PVDF composites were measured by advanced measuring means. The composites with conductor loaded have higher energy density. Among, the Ni@BT/PVDF composites with loaded 7 vol% Ni@BT nanoparticles have higher energy density. The maximum was 4.89 J/cm3.A iayer of porous BaTiO3 coated on solid BaTiO3 which size was 100nm were prepared by sol-gel method and P123 as template. The best process of the preparation of porous BaTiO3 was determined by studying the influence of the mass fraction of P123, the pH of solution and the sequence of adding solution. When the mass fraction of P123 was 3%,the pH of the solution was 3-4, the sequence of adding solution was the porous BaTiO3 alcohol solution of was added firstly, the porous BaTiO3 had no agglomerates, the sizes were 120nm and the pore sizes were 22.4nm.The dielectric properties and breakdown strength and energy density of porous BaTiO3/PVDF composites and the mechanism which improve the properties of the composites were studied. When the volume fractions of porous BaTiO3 were respectively 0%,3%,5%,7%,10%, the dielectric constant of BaTiO3/PVDF composites was gradually increasing, the maximum was 16.7.The breakdown strength increased at first then decreased, when the volume fration of porous BaTiO3 was 3%,the breakdown strength reached to 271kV/mm. When the volume fration of porous BaTiO3 was 7%, the energy density was 3.83 J/cm3.The porous structure and high surface area of BaTiO3 induce the phase change of PVDF,and induce the formation of β phase.Ag@BT nanoparticles were prepared by solution reduction method. The fraction which loaded on porous BaTiO3 was 3%,the composites have high breakdown strength.The volume fraction in Ag@BT/PVDF composites of Ag@BT nanoparticles were respectively 0%,3%,5%,7%, 10%,the dielectric constant gradually increasing, reached to 24.2.The breakdown strength increased at first then decreased, when the volume fration of Ag@BT was 3%,the breakdown strength was 263kV/mm, and the highest energy density was 4.34J/cm3.Ni@BT nanoparticles were prepared by solution reduction method. The fraction which loaded on porous BaTiO3 was 7%.The volume fraction in Ni@BT/PVDF composites of Ni@BT nanoparticles were respectivel 0%,3%,5%,7%,10%,the dielectric constant gradually increasing, the maximum was 20.2.The breakdown strength increased at first then decreased, when the volume fration of Ni@BT was 3%,the breakdown strength was 305kV/mm, and the highest energy density was 4.89J/cm3, the volume fraction of Ni@BT was 5%.The C@BT nanoparticles were prepared by azeotropic distillation method. The fraction which loaded on porous BaTiO3 was 5%.When the fraction of C@BT was 10%, the maximum dielectric constant was 19. The breakdown strength increased at first then decreased, when the volume fration of C@BT was 3%,the breakdown strength was 272kV/mm, and the highest energy density was 4.26/cm3,the volume fraction of C@BT was 7%.