Largely enhanced dielectric properties of polymer composites with HfO2 nanoparticles for high-temperature film capacitors

Polymer dielectrics are preferred materials for high-energy-density capacitive energy storage. In particular, high-temperature dielectrics that can withstand harsh conditions, e.g., ≥150 °C, is of crucial importance for advanced electronics and electrical power systems. Herein, high-temperature diel...

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Bibliographic Details
Published in:Composites science and technology Vol. 201; p. 108528
Main Authors: Ren, Lulu, Yang, Lijun, Zhang, Siyu, Li, He, Zhou, Yao, Ai, Ding, Xie, Zongliang, Zhao, Xuetong, Peng, Zongren, Liao, Ruijin, Wang, Qing
Format: Journal Article
Language:English
Published: Barking Elsevier Ltd 05.01.2021
Elsevier BV
Subjects:
Dielectric properties
Dielectrics
Electric power systems
Energy storage
Flux density
Hafnium oxide
Hafnium oxide nanoparticles
High temperature
Leakage current
Nanocomposites
Nanoparticles
Permittivity
Polyetherimides
Polymer matrix composites
Polymer nanocomposites
Polymers
High temperature
Hafnium oxide nanoparticles
Dielectric properties
Polymer nanocomposites
Energy storage
ISSN:0266-3538, 1879-1050
Online Access:Get full text
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Summary:Polymer dielectrics are preferred materials for high-energy-density capacitive energy storage. In particular, high-temperature dielectrics that can withstand harsh conditions, e.g., ≥150 °C, is of crucial importance for advanced electronics and electrical power systems. Herein, high-temperature dielectric polymer composites composed of polyetherimide (PEI) matrix and hafnium oxide (HfO2) nanoparticles are presented. It is found that the incorporation of HfO2 with a moderate dielectric constant and a wide bandgap improves the dielectric constant and simultaneously reduces the high-field leakage current density of the PEI nanocomposites. As a result, the PEI/HfO2 composites exhibit superior energy storage performance to the current high-temperature engineering polymers at elevated temperatures. Specifically, the nanocomposite with 3 vol% HfO2 displays a discharged energy density of 2.82 J/cm3 at 150 °C, which is 77% higher than neat PEI. This work demonstrates the effectiveness of incorporation of the nanofiller with a medium dielectric constant into the polymer on the improvement of high-temperature capacitive properties of the polymer composites. [Display omitted]
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ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2020.108528