Tuning Ba/Sr ratios of BaxSr1-xTiO3 of polymer nanocomposites toward significant enhancement of energy storage performance by optimized phase composition

The rapid development of portable electronic equipment, hybrid electric vehicles and pulse power systems have put forward higher requirements for new dielectric materials, making flexible polymer dielectrics attractive. Barium strontium titanate nanoparticles with different compositions were successfully prepared by using oxalate. A series of PVDF/BaxSr1-xTiO3 nanoparticles nanocomposites were prepared using the semi-crystalline ferroelectric polymer polyvinylidene fluoride PVDF as the polymer matrix. The micro-structure and electrical properties of the nanocomposites were characterized to explore the effects of the composition and intrinsic properties of the filling phase on the nanocomposites. Among all the groups of nanocomposites, the 1 vol% PVDF/Ba0.6Sr0.4TiO3@DA NPs has the highest discharge energy density at the breakdown field strength, which is 7.8 J/cm3. The excellent discharge energy efficiency of 1 vol% PVDF/ Ba0.6Sr0.4TiO3@DA NPs is maintained at 65 % at 300 kV/mm. This paper can provide experimental guidance and theoretical basis for the development of high energy storage density dielectric materials and their application in dielectric energy storage capacitors.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

The development of portable electronic equipment, hybrid electric vehicles, and pulse power systems requires new dielectric materials with higher performance, making flexible polymer dielectrics desirable. In this study, Barium strontium titanate nanoparticles were successfully prepared using oxalate, and PVDF/BaxSr1-xTiO3 nanoparticles nanocomposites were synthesized. The micro-structure and electrical properties of the nanocomposites were analyzed to understand the effects of composition and intrinsic properties on their performance. Among all the groups, the 1 vol% PVDF/Ba0.6Sr0.4TiO3@DA NPs exhibited the highest discharge energy density and an excellent discharge energy efficiency of 65% at 300 kV/mm. This research provides experimental guidance and theoretical foundation for the development and application of high energy storage density dielectric materials in energy storage capacitors.