Energy storage properties of polyimide/BaTiO3 nanocomposite films and their breakdown mechanism in a wide content range

Jiasheng Ru, Daomin Min, Michael Lanagan, Shengtao Li, George Chen

Research output: Contribution to journalArticle

Abstract

Polyimide (PI) has excellent dielectric properties with superior thermal stability, and it is considered as a promising polymer dielectric for energy storage capacitors. Here, we studied the energy storage properties of PI composite films with BaTiO3 (BT) nanoparticles in a wide content range. Benefiting from the high breakdown strength (520 kV/mm), the nanocomposite filled with 0.05 wt. % of BT exhibits an increased energy density of 4.51 J/cm3 at room temperature and keeps a good thermal stability (3.22 J/cm3 at 100 °C). Additionally, trap properties of the nanocomposites and their effect on breakdown strength were studied by thermally stimulated depolarization current. It was found that the dominant trap parameter on breakdown strength variation, with the increase in the BT content, is correlated with deep traps, deep and shallow traps especially their depths, and shallow trap density. Then, a physical quantity of average trap depth was introduced, the value of which decreases from 0.81 eV to 0.44 eV as the BT content increases to 50 wt. %, and a clear correspondence was discovered between the average trap depth and breakdown strength.

Original languageEnglish (US)
Article number213901
JournalApplied Physics Letters
Volume115
Issue number21
DOIs
StatePublished - Nov 18 2019

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energy storage
polyimides
nanocomposites
breakdown
traps
thermal stability
depolarization
dielectric properties
capacitors
flux density
nanoparticles
composite materials
polymers
room temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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title = "Energy storage properties of polyimide/BaTiO3 nanocomposite films and their breakdown mechanism in a wide content range",
abstract = "Polyimide (PI) has excellent dielectric properties with superior thermal stability, and it is considered as a promising polymer dielectric for energy storage capacitors. Here, we studied the energy storage properties of PI composite films with BaTiO3 (BT) nanoparticles in a wide content range. Benefiting from the high breakdown strength (520 kV/mm), the nanocomposite filled with 0.05 wt. {\%} of BT exhibits an increased energy density of 4.51 J/cm3 at room temperature and keeps a good thermal stability (3.22 J/cm3 at 100 °C). Additionally, trap properties of the nanocomposites and their effect on breakdown strength were studied by thermally stimulated depolarization current. It was found that the dominant trap parameter on breakdown strength variation, with the increase in the BT content, is correlated with deep traps, deep and shallow traps especially their depths, and shallow trap density. Then, a physical quantity of average trap depth was introduced, the value of which decreases from 0.81 eV to 0.44 eV as the BT content increases to 50 wt. {\%}, and a clear correspondence was discovered between the average trap depth and breakdown strength.",
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Energy storage properties of polyimide/BaTiO3 nanocomposite films and their breakdown mechanism in a wide content range. / Ru, Jiasheng; Min, Daomin; Lanagan, Michael; Li, Shengtao; Chen, George.

In: Applied Physics Letters, Vol. 115, No. 21, 213901, 18.11.2019.

Research output: Contribution to journalArticle

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