Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3428656
Keywords
dielectric polarisation; energy storage; ferroelectric materials; polymer blends; polymer films; polymer structure; solid-state phase transformations
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Funding
- National Natural Science Foundation of China [50903065]
- National Basic Research Program of China [2009CB623306]
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High discharged energy density observed in poly(vinylidene fluoride) (PVDF) based copolymers has attracted considerable research interests in the past years. Crystalline properties exhibit great influence on their dielectric and energy storage properties. To understand how crystalline properties influence the energy storage properties of PVDF, PVDF films with three different crystal forms are investigated in this paper. It is shown that gamma-PVDF is allowed to work under higher electric fields than alpha- and beta-PVDF in the absence of phase transition in alpha-PVDF and early polarization saturation in beta-PVDF. Consequently, gamma-PVDF exhibits the highest energy density of 14 J/cm(3) under 500 MV/m electric field. (C) 2010 American Institute of Physics. [doi:10.1063/1.3428656]
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