In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 36 ( 2022), p. 18950-18961
Abstract:
Inorganic ferroelectric/polymer nanocomposite based dielectric capacitors possess fast charge/discharge rates, but they deliver low discharged energy density ( U e ) and charge–discharge efficiency ( η ) due to the large remnant electric displacement ( D r ), limiting their use in modern integrated electronic devices. In this study, AgNbO 3 (AN) lead-free antiferroelectric (AFE) nanoparticles (NPs) with near-zero D r and large D max are added into poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) polymers to suppress D r and improve D max of the nanocomposites. Furthermore, polyimide (PI)–AN NPs/P(VDF-HFP) bilayer nanocomposites are designed and fabricated by adding a linear PI layer with low dielectric constant and high η to improve the interface polarization and make the D – E loops slimmer. Consequently, benefiting from a large E b of 4504 kV cm −1 , high D max of 7.06 μC cm −2 , high D max − D r of 6.52 μC cm −2 and low dielectric loss of 1%, the PI–5 wt% AN NPs/P(VDF-HFP) bilayer nanocomposites exhibit simultaneously a large U e of 13.77 J cm −3 and high η of 86.87%, outperforming recently reported dielectric nanocomposites in terms of overall energy storage properties. Finite element simulations demonstrate that the introduction of the PI layer causes redistribution of the applied electric field, which restrains the growth of electrical trees at the interfaces of PI and AN NPs/P(VDF-HFP) layers, resulting in a significant enhancement of the E b . This work refutes the notion that large U e and η cannot be achieved simultaneously in one kind of nanocomposite and sheds light on developing environmentally friendly dielectric capacitors applicable in modern pulse power systems.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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