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

Energy storage properties of polyimide/BaTiO3 nanocomposite films and their breakdown mechanism in a wide content range
Energy storage properties of polyimide/BaTiO3 nanocomposite films and their breakdown mechanism in a wide content range
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.
0003-6951
1-5
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Ru, Jiasheng
6e6758d0-4ddf-4af6-b37d-22982df06525
Min, Daomin
24d10906-2848-417e-a941-3bf61d9b4a57
Lanagan, Michael
5dbd0b4d-1e6a-42db-8b16-d4b98a14c0ed
Li, Shengtao
dda287d9-de3f-4e19-87d9-f5237ac3aa06
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Ru, Jiasheng
6e6758d0-4ddf-4af6-b37d-22982df06525
Min, Daomin
24d10906-2848-417e-a941-3bf61d9b4a57
Lanagan, Michael
5dbd0b4d-1e6a-42db-8b16-d4b98a14c0ed
Li, Shengtao
dda287d9-de3f-4e19-87d9-f5237ac3aa06

Chen, Guanghui, Ru, Jiasheng, Min, Daomin, Lanagan, Michael and Li, Shengtao (2019) Energy storage properties of polyimide/BaTiO3 nanocomposite films and their breakdown mechanism in a wide content range. Applied Physics Letters, 115, 1-5, [213901]. (doi:10.1063/1.5115766).

Record type: Article

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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More information

Submitted date: 21 June 2019
Accepted/In Press date: 1 November 2019
Published date: 18 November 2019

Identifiers

Local EPrints ID: 436059
URI: http://eprints.soton.ac.uk/id/eprint/436059
ISSN: 0003-6951
PURE UUID: f2aaa7a5-d924-4375-8b34-ad058912ec10

Catalogue record

Date deposited: 27 Nov 2019 17:30
Last modified: 21 Jan 2020 17:34

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