What is it about?
An efficient way to improve dielectric and energy storage properties of P(VDF-HFP) films by inducing a high b-phase content and lowering the crystallite size through repetitive unipolar nanosecond electric pulses (nsEP) is proposed. It is found that the percentage of the b-phase in P(VDF-HFP) can be significantly enhanced to 84% under a low unipolar nsEP of 5 V/mm vs only 35% in pristine P(VDF-HFP). Meanwhile, the orientation of the amorphous chains is also achieved, which improves the dielectric constant, electric breakdown, and energy storage properties of P(VDF-HFP). Specifically, the P(VDF-HFP) film processed under nsEP of 5V/mm exhibits a high breakdown field of 541 MV/m, and discharged energy density of 14 J/cm3, which is 28.8% and 127% higher than those of the pristine polymer, respectively.
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Perspectives
This work provides a facile approach to optimize the crystalline morphology of P(VDF-HFP) polymers for dielectric energy storage applications.
Xuetong Zhao
Chongqing University
Read the Original
This page is a summary of: Enhanced dielectric and energy storage properties of P(VDF-HFP) through elevating β-phase formation under unipolar nanosecond electric pulses, Frontiers in Human Neuroscience, January 2023, American Institute of Physics,
DOI: 10.1063/5.0128998.
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