Enhanced Energy Storage of Dielectric Nanocomposites at Elevated Temperatures

Abstract

Enhancing the performance of dielectric capacitors toward higher energy density and higher operating temperatures has been drawing increased interest. Therefore, in this investigation, research efforts were dedicated to the fabrication and characterization of nanocomposites in order to enhance the energy density at both room temperature and elevated temperature. The dielectric capacitors are fabricated using nanocomposites composed of BaTiO3 nanoparticles with polyimide (PI) matrix aiming at combining the high relative dielectric permittivity of the ceramic filler and the high breakdown strength of the polymeric matrix. Dielectric energy storage performance is assessed for nanocomposites with volume fractions ranging from 0 to 20% under operating frequency from 20 Hz to 1 MHz and temperatures ranging from 20 to 120∘C. It is observed that with the increase of temperature, the capacitance increased while the energy density slightly decreased but significantly higher than pure polymer samples. The highest energy density was found for BaTiO3/PI nanocomposites with 20% volume fraction, 9.63 J/cm3 at 20∘C and 6.79 J/cm3 at 120∘C. Overall, testing results indicate that using nanocomposites of BaTiO3/PI as a dielectric component shows promise for implementation to preserve high energy density values up to temperatures of 120∘C.

High-Temperature Polyimide Dielectric Materials for Energy Storage

“…Theoretical models were also used to predict the ε r of composite materials to study the role of the diameter and shape of the nanoparticles. Rajib et al [18] prepared BT/PI nanocomposites and increased their energy density at high temperatures using different volume fractions to analyze their effect on the dielectric properties. All samples were tested at high temperatures to evaluate their energy storage capacity.…”

Ultrathin ceramic nanowires for high interface interaction and energy density in PVDF nanocomposites

“…The energy density of dielectric materials could be described by the formula U e = ∫ EdD and D = ε E, where U e , D, ε , and E represent the energy density, electric displacement, dielectric constant and electric field, respectively . Therefore, to enhance the energy density, nanocomposites comprising large dielectric constant ceramic fillers, such as barium titanate (BaTiO 3 ), strontium titanate (SrTiO 3 ), calcium barium zirconate titanate (Ba 0.95 Ca 0.05 Zr 0.15 Ti 0.85 O 3 ), etc., and high breakdown strength (E b ) polymers, such as poly(vinylidene fluoride) (PVDF, 300 kV/mm), biaxially oriented polypropylene (BOPP, 700 kV/mm), polyimide (PI, 350 kV/mm), etc., are considered to be one of the most potential options in dielectric materials …”

Unfolding dielectric breakdown effects on energy storage performances of modified (Sr0.98Ca0.02)(Ti1‐xZrx)O3 ceramics

“…Advanced dielectrics have attracted great attention in recent years due to their unusual dielectric responses which can be used in a number of electronic devices, such as transducers, sensors, phase shifter, capacitors, etc., not only for normal working environment but also for some extreme conditions . Some of these dielectrics have recently been projected for the application as energy storage units in capacitors under high voltages, providing high‐power density with fast charging and discharging rates compared with Li‐ion batteries and fuel cells .…”