Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 2, Pages 405-413Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc04555k
Keywords
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Funding
- Ministry of Science and Technology of China through the 973-project [2015CB654601]
- National Natural Science Foundation of China [51802047]
- Foundation for Young Talents in Educational Commission of Guangdong Province [2017KQNCX147]
- K. C. Wong Magna Fund in Ningbo University
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For superior performance capacitors, large discharge energy density along with high discharge efficiency, high power density, and ultrafast charging/discharging speed are desired. Herein, we design and prepare new high quality nanocomposite films containing linear dielectric core-shell SrTiO3@Al2O3 nanofibers (ST@AO NFs) and poly(vinylidene fluoride) (PVDF) demonstrating remarkable energy storage performance. The experimental and finite element simulation results suggest that the incorporation of amorphous AO between the ST NFs and PVDF matrix could effectively improve the electric field strength, electric potential distribution, and current density of the nanocomposite films, resulting in greatly enhanced energy density and discharge efficiency. More importantly, the nanocomposite films loaded with 5 vol% ST@AO NFs show an outstanding discharge energy density of 15.3 J cm(-3) at 475 MV m(-1) and maintain a high discharge efficiency of 68.52%. Moreover, the corresponding nanocomposite films illustrate an ultra-fast discharge rate of 127 ns. The promising overall dielectric properties offer a new insight into the development of next-generation dielectric capacitor materials.
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