Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

Meng, Nan; Ren, Xintong; Santagiuliana, Giovanni; Ventura, Leonardo; Zhang, Han; Wu, Jiyue; Yan, Haixue; Reece, Michael J.; Bilotti, Emiliano

doi:10.1038/s41467-019-12391-3

Cited by 286 publications

(192 citation statements)

References 57 publications

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“…PVDF crystallizes into the a-phase when cooled from the melt. The b-phase is usually obtained after post-treatments of the as-formed a-phase, like solid-state drawing, 8 solid-state pressure deformation 10 and/or electric field poling (4500 kV mm À1 ). 8 Poling at relatively low electric fields (B170 kV mm À1 11,12 ) can only transform the a-phase into the d-phase.…”

Section: Introductionmentioning

confidence: 99%

Multiscale understanding of electric polarization in poly(vinylidene fluoride)-based ferroelectric polymers

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Multiscale understanding of electric polarization in poly(vinylidene fluoride)-based ferroelectric polymers

et al. 2020

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“…The absorption coefficients K 840 and K 763 are taken to be 7.7×10 4 and 6.1×10 4 cm 2 mol −1 [25,27]. The individual phase fraction of β and γ-phases from the total polar phase is calculated using: where I 1275 and I 1234 are the absorbencies at 1275 cm −1 (β phase) and 1234 cm −1 (γ-phase), respectively [28].…”

Section: Infrared Spectroscopy Analysis To Investigate the Interactiomentioning

confidence: 99%

Role of protic ionic liquid concentration in proton conducting polymer electrolytes for improved electrical and thermal properties

Nair

Mohapatra

Garda

et al. 2020

Mater. Res. Express

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Protic ionic liquids (PILs) in the acidic medium are known to show higher ionic conductivity than neat PIL or PIL in alkaline media. Hence, polymer electrolyte membranes (PEM) containing both PIL and acids are considered ideal for non-humidified intermediate temperature PEM fuel cells. Herein, we report non-aqueous proton conducting PEM made up of diethylmethylammonium trifluoromethanesulfonate; [dema][TfO] and neat phosphoric acid (H 3 PO 4 ) with poly (vinylidene fluoride-cohexafluoropropylene); PVDF-HFP as the host matrix. The presence of PIL significantly modified the structure and microstructure of the electrolyte films with the emergence of micropores in the PIL containing membranes. SEM images suggest leaching of PIL and phosphoric acid above 80 wt% of PIL in the electrolyte membranes. Thermogravimetric studies show that the dehydration in the PEM films due to phosphoric acid condensation at 100°C-200°C region is arrested by the presence of PIL. The maximum ionic conductivity at room temperature is ∼6.3×10 −4 S cm −1 at 40 wt% of [dema][TfO] addition, which is two orders higher than that of the primary electrolyte (PE) containing only phosphoric acid in PVDF-HFP. This high conductivity in PEM films can be correlated to the increase in polar β and γ phases as well as a drop in the total crystallinity fraction in the film. The study using dielectric spectroscopy reveals a strong coupling of ionic conductivity with the structural or segmental relaxation of the PVDF-HFP due to the presence of [dema][TfO] in the PEMs.

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“…where E and D are the applied electric field and displacement, respectively [2]. Specifically, for linear dielectrics:…”

Section: Introductionmentioning

confidence: 99%

Enhanced Energy Storage Characteristics in PVDF-Based Nanodielectrics With Core-Shell Structured and Optimized Shape Fillers

et al. 2020

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Introducing high-permittivity nano-fillers into a dielectric polymer is a practical way to enhance the permittivity of nanocomposite dielectrics. However, this normally leads to a decrease in the breakdown strength, which has limited the development of electrostatic capacitors. In this work, silica (SiO 2) coating and polydopamine (PDA) surface modification methods were combined for enhancement of the breakdown strength; we prepared poly(vinylidene fluoride) (PVDF) based composite dielectrics doped using double core-shell structure BaTiO 3 nano-particles (BT NPs) and nano-fibers (NFs) (PDA-SiO 2 @BT NPs/PVDF or PDA-SiO 2 @BT NFs/PVDF). Then, the contributions of the double-layer core-shell structure and filler shape to improving the energy storage performance of the dielectrics were systematically discussed. The results show that the synergy between the silica and PDA effectively increased the breakdown strength. Furthermore, the dielectric properties and energy storage properties of the PVDF-based dielectrics with various double core-shell filler (PDA-SiO 2 @BT NPs or PDA-SiO 2 @BT NFs) contents were also investigated. Compared with the particles, appropriate introduction of the PDA-SiO 2 @BT NFs could more preferentially improve the energy storage characteristics. It was found that 1.0 vol.% PDA-SiO 2 @BT NFs/PVDF exhibited a high energy storage density of 14.7 J/cm 3 with an efficiency of 68%. This research provides a promising avenue for enhancing the energy storage capability of PVDF-based nanocomposite dielectrics. INDEX TERMS Nanofiber, core-shell structure, polydopamine, silica, poly(vinylidene fluoride), energy storage density.

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Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

Cited by 286 publications

References 57 publications

Multiscale understanding of electric polarization in poly(vinylidene fluoride)-based ferroelectric polymers

Multiscale understanding of electric polarization in poly(vinylidene fluoride)-based ferroelectric polymers

Role of protic ionic liquid concentration in proton conducting polymer electrolytes for improved electrical and thermal properties

Enhanced Energy Storage Characteristics in PVDF-Based Nanodielectrics With Core-Shell Structured and Optimized Shape Fillers

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