Enhanced dielectric properties of sol–gel-BaTiO₃/P(VDF-HFP) composite films without surface functionalization

Abstract

BaTiO3–P(VDF-HFP) composite films without surface functionalization show a tenfold increase of the relative permittivity compared to the pure polymer.

Decoupling the Ionic Conductivity and Elastic Modulus of Gel Electrolytes: Fully Zwitterionic Copolymer Scaffolds in Lithium Salt/Ionic Liquid Solutions

“…As reported elsewhere, the P-O stretching vibrational band,  1 , for phosphonate groups appears in the wavenumber range 960 -970 cm -1 . [42] Figure 3b observed in the sample that contains LiTFSI, from 965 to 969 cm -1 . This result indicates an attractive interaction between the negatively-charged phosphonate group of the MPC zwitterion and Li + within the 1 M LiTFSI-BMP TFSI solution.…”

Enhancement of dielectric properties and energy storage density in poly(vinylidene fluoride-co-hexafluoropropylene) by relaxor ferroelectric ceramics

“…14,15 Thus, nding a material with a high dielectric constant and dielectric strength without a large increase in dielectric loss is the key factor to promote the development of dielectric materials for energy storage applications. 16 In general, ferroelectric ceramics, such as Pb(Zr, Ti)O 3 (PZT), and BaTiO 3 , have oen been chosen for use as llers in polymer composites due to their high dielectric constants. [17][18][19] However, ferroelectric ceramics always suffer from fat hysteresis loops with high coercive electric elds and high remanent polarization, which decreases the discharged energy density and energy efficiency.…”

Influence of Matrix and Surfactant on Piezoelectric and Dielectric Properties of Screen-Printed BaTiO3/PVDF Composites

“…Future perspectives of this experimental work will focus on material and process improvements, as well as on further analyses aimed at the following: Performing plasma fluorinated functionalization of the PEDOT layer in order to improve the wettability of PVDF on the electrode; this is likely to reduce the roughness and the waviness of the composite layer [ 45 ] and, thus, not only improve the performances of the composites, but also reduce the uncertainty of the thickness (which makes it hard to carry out consistent comparisons between each formulation, in terms of permittivity and loss tangent). Adding other surfactants (e.g., dopamine dichloride) to enhance the homogeneity of the dispersion and reduce the phase separation between triethyl phosphate (TEP) and PVDF, preventing segregation during screen-printing and ink storage [ 23 ]. Carrying out hot pressure on the composite layer to reduce porosity [ 33 ].…”

“…Adding other surfactants (e.g., dopamine dichloride) to enhance the homogeneity of the dispersion and reduce the phase separation between triethyl phosphate (TEP) and PVDF, preventing segregation during screen-printing and ink storage [ 23 ].…”

“…For instance, silanes tend to enhance the mechanical resistance and elastic modulus [ 22 ]. Alternatively, dopamine hydrochloride increases the breakdown field, the permittivity, and the energy storage capability in PVDF/BaTiO 3 composites [ 23 ]. Furthermore, IDPI (an epoxy-functionalized coupling agent) speeds up the poling process, improving d 33 (at a fixed time) in PZT/epoxy composites [ 24 ].…”