Surface-modified barium titanate by MEEAA for high-energy storage application of polymer composites

Abstract

In this study, 2-[2-(2-methoxyethoxy)ethoxy]acetic acid (MEEAA) was used to modify the surface of barium titanate nanoparticles (BT NPs) to enhance the compatibility and dispersion of the BT ceramic fillers in polymer matrix. A uniform coating layer with a thickness about 2 nm was formed on the surface of BT after modification. The poly(vinylidene fluoride)-hexafluoropropene [P(VDF-HFP)] composites filled with MEEAA-modified BT NPs achieved higher permittivity(∼13 at 3.0 vol% filler) and discharged energy density than that of the untreated BT filled composite. The maximum discharge energy density of 7.8 J/cm^3 was obtained in the nanocomposites with 3 vol% MEEAA-modified BT NPs at electric field of 425 kV/mm, which is 77% higher than that of 4.4 J/cm^3 of pure P(VDF-HFP) film at electric field of 420 kV/mm.

Keywords

• barium compounds
• filled polymers
• nanoparticles
• nanocomposites
• nanofabrication
• coatings
• thin films
• permittivity
• surface-modified barium titanate nanoparticles
• high-energy storage application
• polymer composites
• 2-[2-(2-methoxyethoxy)ethoxy]acetic acid
• dispersion
• ceramic fillers
• polymer matrix
• coating layer
• poly(vinylidene fluoride)-hexafluoropropene film composites
• permittivity
• discharged energy density
• discharge energy density
• nanocomposites
• electric field