期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 40, 页码 27236-27242出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10016
关键词
polymer blends; dielectric; energy density; ferroelectricity; electric displacement
资金
- National Basic Research Program of China [2015CB654603]
- NSF of China [51572141, 51532003]
- Research Fund of Science and Technology in Shenzhen [JSGG20150331155519130]
Polymers with high dielectric strength and favorable flexibility have been considered promising materials for dielectrics and energy storage applications, while the achievable energy density (U-e) of polymer is rather limited by the intrinsic low dielectric constant and ferroelectric hysteresis. Polyvinylidene fluoride-trifluoroethylene-chloro-fluoroethylene (P(VDF-TrFE-CFE)) with ultrahigh epsilon(r) of >50 is considered promising in achieving high Ue of polymer dielectrics. However, P(VDF-TrFE-CFE) only exhibits moderate Ue due to the early saturation of electrical polarization at low electric field. In this contribution, we show that, by blending P(VDF-TrFE-CFE) with polyvinylidene fluoride (PVDF), the early saturation of P(VDF-TrFE-CFE) is substantially suppressed, giving rise to concomitant enhancement of dielectric permittivity and breakdown strength. An ultrahigh energy density of 19.6 J/cm(3) is thus achieved at similar to 640 kV/mm, which is 1600% greater than Ue of the benchmark biaxially oriented polypropylene (BOPP, 1.2 J/cm(3) at 640 kV/mm). Results of phase field simulations reveal that the interfaces between PVDF and P(VDF-TrFE-CFE) play a critical role by not only suppressing early saturation of electrical polarization in P(VDF-TrFE-CFE) but also inducing additional interfacial polarization. Binary phase diagram of P(VDF-TrFE-CFE)/PVDF blends is also systematically explored with their dielectric and energy storage behavior studied.
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