Flexible high-temperature dielectric materials from polymer nanocomposites

A Corrigendum to this article was published on 13 April 2016


Dielectric materials, which store energy electrostatically, are ubiquitous in advanced electronics and electric power systems1,2,3,4,5,6,7,8. Compared to their ceramic counterparts, polymer dielectrics have higher breakdown strengths and greater reliability1,2,3,9, are scalable, lightweight and can be shaped into intricate configurations, and are therefore an ideal choice for many power electronics, power conditioning, and pulsed power applications1,9,10. However, polymer dielectrics are limited to relatively low working temperatures, and thus fail to meet the rising demand for electricity under the extreme conditions present in applications such as hybrid and electric vehicles, aerospace power electronics, and underground oil and gas exploration11,12,13. Here we describe crosslinked polymer nanocomposites that contain boron nitride nanosheets, the dielectric properties of which are stable over a broad temperature and frequency range. The nanocomposites have outstanding high-voltage capacitive energy storage capabilities at record temperatures (a Weibull breakdown strength of 403 megavolts per metre and a discharged energy density of 1.8 joules per cubic centimetre at 250 degrees Celsius). Their electrical conduction is several orders of magnitude lower than that of existing polymers and their high operating temperatures are attributed to greatly improved thermal conductivity, owing to the presence of the boron nitride nanosheets, which improve heat dissipation compared to pristine polymers (which are inherently susceptible to thermal runaway). Moreover, the polymer nanocomposites are lightweight, photopatternable and mechanically flexible, and have been demonstrated to preserve excellent dielectric and capacitive performance after intensive bending cycles. These findings enable broader applications of organic materials in high-temperature electronics and energy storage devices.

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Figure 1: Material preparation and structures.
Figure 2: Dielectric stability.
Figure 3: Electrical energy storage capability.
Figure 4: Steady-state temperature distribution.


  1. 1

    Sarjeant, W. J., Zirnheld, J. & MacDougall, F. W. Capacitors. IEEE Trans. Plasma Sci. 26, 1368–1392 (1998)

    ADS  CAS  Article  Google Scholar 

  2. 2

    Sarjeant, W. J., Clelland, I. W. & Price, R. A. Capacitive components for power electronics. Proc. IEEE 89, 846–855 (2001)

    CAS  Article  Google Scholar 

  3. 3

    Tan, Q., Irwin, P. & Cao, Y. Advanced dielectrics for capacitors. IEEJ Trans. Fund. Mater. 126, 1152–1159 (2006)

    Google Scholar 

  4. 4

    Irvine, J. T. S., Sinclair, D. C. & West, A. R. Electroceramics: characterization by impedance spectroscopy. Adv. Mater. 2, 132–138 (1990)

    CAS  Article  Google Scholar 

  5. 5

    Reaney, I. M. & Iddles, D. Microwave dielectric ceramics for resonators and filters in mobile phone networks. J. Am. Ceram. Soc. 89, 2063–2072 (2006)

    CAS  Google Scholar 

  6. 6

    Bell, A. J. Ferroelectrics: the role of ceramic science and engineering. J. Eur. Ceram. Soc. 28, 1307–1317 (2008)

    CAS  Article  Google Scholar 

  7. 7

    Ogihara, H., Randall, C. A. & Trolier-McKinstry, S. High-energy density capacitors utilizing 0.7 BaTiO3–0.3 BiScO3 ceramics. J. Am. Ceram. Soc. 92, 1719–1724 (2009)

    CAS  Article  Google Scholar 

  8. 8

    Xiong, B., Hao, H., Zhang, S. J., Liu, H. X. & Cao, M. H. Structure, dielectric properties and temperature stability of BaTiO3–Bi(Mg1/2Ti1/2)O3 perovskite solid solutions. J. Am. Ceram. Soc. 94, 3412–3417 (2011)

    CAS  Article  Google Scholar 

  9. 9

    Chu, B. J. et al. A dielectric polymer with high electric energy density and fast discharge speed. Science 313, 334–336 (2006)

    ADS  CAS  Article  Google Scholar 

  10. 10

    Ho, J., Jow, T. R. & Boggs, S. Historical introduction to capacitor technology. IEEE Electr. Insul. Mag. 26, 20–25 (2010)

    Article  Google Scholar 

  11. 11

    Johnson, R. W., Evans, J. L., Jacobsen, P., Thompson, J. R. & Christopher, M. The changing automotive environment: high-temperature electronics. IEEE Trans. Electron. Packag. Manuf. 27, 164–176 (2004)

    Article  Google Scholar 

  12. 12

    Watson, J. & Castro, G. High-temperature electronics pose design and reliability challenges. Analog. Dialog 46, 1–7 (2012)

    Google Scholar 

  13. 13

    Weimer, J. A. Electrical power technology for the more electric aircraft. In Proc. AIAA/IEEE Digital Avionics Systems Conf. http://dx.doi.org/10.1109/DASC.1993.283509 (IEEE, 1993)

    Google Scholar 

  14. 14

    Rabuffi, M. & Picci, G. Status quo and future prospects for metallized polypropylene energy storage capacitors. IEEE Trans. Plasma Sci. 30, 1939–1942 (2002)

    ADS  CAS  Article  Google Scholar 

  15. 15

    Wang, D. H., Kurish, B. A., Treufeld, I., Zhu, L. & Tan, L. S. Synthesis and characterization of high nitrile content polyimides as dielectric films for electrical energy storage. J. Polym. Sci. A 53, 422–436 (2015)

    CAS  Article  Google Scholar 

  16. 16

    Ho, J. & Jow, T. R. High field conduction in heat resistant polymers at elevated temperature for metallized film capacitors. In Power Modulator and High Voltage Conf. http://dx.doi.org/10.1109/IPMHVC.2012.6518764 (IEEE, 2012)

    Google Scholar 

  17. 17

    Venkat, N. et al. High temperature polymer film dielectrics for aerospace power conditioning capacitor applications. Mater. Sci. Eng. B 168, 16–21 (2010)

    CAS  Article  Google Scholar 

  18. 18

    Tan, D., Zhang, L. L., Chen, Q. & Irwin, P. High-temperature capacitor polymer films. J. Electron. Mater. 43, 4569–4575 (2014)

    ADS  CAS  Article  Google Scholar 

  19. 19

    Pan, J. L., Li, K., Chuayprakong, S., Hsu, T. & Wang, Q. High-temperature poly(phthalazinone ether ketone) thin films for dielectric energy storage. ACS Appl. Mater. Interf. 2, 1286–1289 (2010)

    CAS  Article  Google Scholar 

  20. 20

    Dean, C. R. et al. Boron nitride substrates for high-quality graphene electronics. Nature Nanotechnol. 5, 722–726 (2010)

    ADS  CAS  Article  Google Scholar 

  21. 21

    Sevik, C., Kinaci, A., Haskins, J. B. & Çağın, T. Characterization of thermal transport in low-dimensional boron nitride nanostructures. Phys. Rev. B 84, 085409 (2011)

    ADS  Article  Google Scholar 

  22. 22

    Coleman, J. N. et al. Two-dimensional nanosheets produced by liquid exfoliation of layered materials. Science 331, 568–571 (2011)

    ADS  CAS  Article  Google Scholar 

  23. 23

    Ieda, M. Dielectric breakdown process of polymers. IEEE Trans. Electr. Insul. 15, 206–224 (1980)

    Article  Google Scholar 

  24. 24

    Li, Q. et al. Solution-processed ferroelectric terpolymer nanocomposites with high breakdown strength and energy density utilizing boron nitride nanosheets. Energy Environ. Sci. 8, 922–931 (2015)

    CAS  Article  Google Scholar 

  25. 25

    Dang, Z. M., Yuan, J., Yao, S. H. & Liao, R. J. Flexible nanodielectric materials with high permittivity for power energy storage. Adv. Mater. 25, 6334–6365 (2013)

    CAS  Article  Google Scholar 

  26. 26

    Montanari, D. et al. Film capacitors for automotive and industrial applications. In Proc. CARTS USA 23–38 (Electronic Components Industry Association, 2009)

    Google Scholar 

  27. 27

    O'Dwyer, J. J. The Theory of Electrical Conduction and Breakdown in Solid Dielectrics Ch. 1 (Clarendon, 1973)

    Google Scholar 

  28. 28

    Qin, S., Ho, J., Rabuffi, M., Borelli, G. & Jow, T. R. Implications of the anisotropic thermal conductivity of capacitor windings. IEEE Electr. Insul. Mag. 27, 7–13 (2011)

    Article  Google Scholar 

  29. 29

    Zebouchi, N. et al. Electrical breakdown theories applied to polyethylene terephthalate films under the combined effects of pressure and temperature. J. Appl. Phys. 79, 2497–2501 (1996)

    ADS  CAS  Article  Google Scholar 

  30. 30

    Mark, J. E. Physical Properties of Polymers Handbook Ch.10 (AIP Press, 1996)

    Google Scholar 

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Q.W. acknowledges financial support from the US Office of Naval Research under grant number N00014-11-1-0342. L.-Q.C. is supported by the Air Force Office of Scientific Research under grant number FA9550-14-1-0264. H.U.L. and T.N.J. acknowledge support from the Dow Chemical Corporation.

Author information




Q.W. and Q.L. devised the original concept. Q.L. and M.R.G. were responsible for materials synthesis and characterization. Q.L., M.R.G. and G.Z performed dielectric and polarization-loop measurements. L.C. and L.-Q.C. carried out simulation studies. S.Z. and Q.L. performed the studies of high-Tg dielectric polymers. H.U.L. and T.N.J. designed the bending tests. E.I. provided research-grade BCB used in the preparation of the samples reported, and also participated in helpful discussions. A.H. measured thermal conductivities. Q.W. and Q.L. wrote the first draft of the manuscript, and all authors participated in manuscript revision.

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Correspondence to Qing Wang.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Information

This file contains Supplementary Text, Supplementary Figures 1-36, Supplementary Tables 1-6 and additional references. (PDF 6640 kb)

Bending test of c-BCB/BNNS films

A c-BCB/BNNS film is bended repeatedly to a bending radius of 4 mm with a homemade setup. (MP4 24791 kb)

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Li, Q., Chen, L., Gadinski, M. et al. Flexible high-temperature dielectric materials from polymer nanocomposites. Nature 523, 576–579 (2015). https://doi.org/10.1038/nature14647

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