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Journal of Sol-Gel Science and Technology

, Volume 73, Issue 1, pp 22–31 | Cite as

Dielectric properties and energy storage performance of CCTO/polycarbonate composites: influence of CCTO synthesis route

  • Md. Sayful Islam
  • W. Michael Chance
  • Hans-Conrad zur Loye
  • Harry J. PloehnEmail author
Original Paper

Abstract

This work explores the effect of CaCu3Ti4O12 (CCTO) synthetic route on CCTO/polycarbonate (PC) composite microstructure, low-field dielectric properties (εeff and tan δ), and high-field polarization behavior. CCTO was synthesized via the traditional solid-state route and a wet chemical sol–gel route. PXRD, FE-SEM and BET analysis results show that sol–gel CCTO particles are 20 times smaller and have 20 times more surface area per gram than solid-state CCTO particles. Solution-blended 20 vol% sol–gel CCTO/PC composites have up to 12 times higher εeff values than PC. Surprisingly, the permittivity enhancement due to the smaller sol–gel CCTO particles is not much more than that found using the larger solid-state CCTO particles. Sol–gel CCTO/PC composites show higher dielectric loss and specific conductivity than solid-state CCTO/PC composites, probably due to the presence of polyethylene glycol added as a dispersant in sol–gel CCTO synthesis. The CCTO introduces ferroelectric behavior to the composites, including significant remanent polarization, hysteresis, and energy dissipation. The stored and recovered energy densities in CCTO/PC are up to five times higher than PC at the same applied electric field, but the percentage energy loss reaches 70 %. CCTO/PC composites also have greatly reduced breakdown field strength compared to PC, so the composites’ maximum stored energy density is much less than that of PC. Thus CCTO/PC composites are promising for applications requiring high εeff values at low field strengths, but not as dielectrics for high density, pulse power energy storage.

Keywords

CCTO Polycarbonate Dielectric Permittivity Polarization Energy density 

Notes

Acknowledgments

This work was supported as part of HeteroFoaM, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences under Award Number DE-SC0001061. Mary Anne Fitzpatrick, Dean, and the USC selection committee are gratefully acknowledged for supporting WMC via a College of Arts and Sciences Dean’s Dissertation Fellowship.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Md. Sayful Islam
    • 1
  • W. Michael Chance
    • 2
  • Hans-Conrad zur Loye
    • 2
  • Harry J. Ploehn
    • 1
    Email author
  1. 1.Department of Chemical EngineeringUniversity of South CarolinaColumbiaUSA
  2. 2.Department of Chemistry and BiochemistryUniversity of South CarolinaColumbiaUSA

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