Large energy density at high-temperature and excellent thermal stability in polyimide nanocomposite contained with small loading of BaTiO3 nanofibers

By Penghao Hu, Wei Sun, Mingzhi Fan, Jianfeng Qian, Jianyong Jiang, Zhenkang Dan, Yuanhua Lin, C. Nan, Ming Li, Yang Shen. Applications of Surface Science, 2018

154 citations recorded by the source corpus.

Abstract Dielectric capacitors are always faced with high temperature in many application cases, so the applicability of high temperature is highly desired for dielectrics besides large energy storage density. Polyimide is a widely used engineering polymer with excellent thermotolerance and ceramic nanofillers with large aspect ratio are effective in improving the dielectric properties of polymer nanocomposite. In this work, PI nanocomposite films contained with BaTiO3 nanofibers prepared via electrospinning were fabricated by solution casting and thermal imidization process. The dielectric properties of the nanocomposites were investigated from room temperature to 200 °C. With the introduction of BaTiO3 nanofibers, the dielectric permittivity was enlarged with weak increase on dielectric loss in nanocomposites. The breakdown strength (550 kV/mm) as well as discharged energy density (5.82 J/cm3) was largely enhanced in BaTiO3/PI nanocomposite contained with 1 vol% nanofibers. Benefited from the decreased leakage current and improved thermal conduction induced by BaTiO3 nanofibers, the 1 vol% BaTiO3/PI nanocomposite also represented high energy efficiency and excellent thermal stability. The discharged energy density of above 2.1 J/cm3 and near 4 J/cm3 with efficiency larger than 90% are stable from room temperature to 150 °C and to 100 °C respectively. The high temperature applicability of the present material makes it much promising in fabricating dielectric energy storage devices applied in hot environment.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/0e5be41e2fd222f2a10f47b62f1795fa54e04161

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Biomedical Engineering

  1. J. Zha
  2. Z. Dang

In Materials Chemistry

  1. J. Zha
  2. Z. Dang

Citations in the corpus