Tailoring the dipole properties in dielectric polymers to realize high energy density with high breakdown strength and low dielectric loss

Yash Thakur, Minren Lin, Shan Wu, Zhaoxi Cheng, D. Y. Jeong, Qiming Zhang

    Research output: Contribution to journalArticlepeer-review

    23 Scopus citations

    Abstract

    High energy density polymer materials are desirable for a broad range of modern power electronic systems. Here, we report the development of a new class of polymer dielectrics based on polyurea and polythiourea, which possess high thermal stability. By increasing the dipole density, the dielectric constant of meta-phenylene polyurea and methylene polythiourea can be increased to 5.7, compared with aromatic polyurea and aromatic polythiourea, which have a dielectric constant in the range of 4.1-4.3. The random dipoles with high dipolar moment and amorphous structure of these polyurea and polythiourea based polymers provide strong scattering to the charge carriers, resulting in low losses even at high electric fields. Consequently, this new class of polymers exhibit a linear dielectric response to the highest field measured (>700 MV/m) with a high breakdown strength, achieving high energy density (>13 J/cm3) with high efficiency (>90%).

    Original languageEnglish (US)
    Article number114104
    JournalJournal of Applied Physics
    Volume117
    Issue number11
    DOIs
    StatePublished - Mar 21 2015

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)

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