PVDF–BaSrTiO₃ nanocomposites for flexible electrical energy storage devices

Abstract

We have explored the energy storage capability of Ba0·5Sr0 ·5TiO3 (BST)–polyvinylidene fluoride (PVDF) nanocomposites. Morphologically uniform BST colloidal nanocubes were prepared in high yield by a solvothermal method at temperatures as low as 150°C. As-synthesised BST nanocubes were used as fillers (35 vol%) in PVDF polymer matrix. The unique dielectric-polymer films show enhanced dielectric constant (>27) and enhanced electrical breakdown strength (Eb) (2·85 MV/cm). The resulting dielectric energy density for BST–PVDF is 9·7 J/cm3, which is a result of the interplay between dependencies of permittivity and breakdown strength on volume fraction. We propose that the strong nanoparticle–polymer matrix interfacial interaction is the main reason for the observed improved dielectric properties. This wet-chemical-assisted fabrication approach can be readily extended to other combinations of polymers and ceramics with concomitant improvement in properties. Key parameters of various materials (e.g. chemical composition, shape, size and surface reactivity) can be readily controlled in this method, opening up a new pathway to highly flexible macroelectronics.

Magnetic Nano-Сomposites and their Industrial Applications

“…For higher-performance capacitors with auspicious energy storing properties, dielectric polymer nano-composites are generated by combining inorganic nanoparticles into polymer matrices. Recently, energy storage capability of polyvinylidene fluoride (PVDF)-based composites have been reported with variety of NPs including BaTiO 3 , Ba1-xCaxTiO 3 (X=0.3±0.05) [BCT], BaZr1-xTixO 3 (X=0.2±0.05) [BZT], and Ba0.5Sr0.5TiO 3 [BST] [119].…”

Electro-mechanical properties of free standing micro- and nano-scale polymer-ceramic composites for energy density capacitors

“…Recently various glass-ceramics composites have been investigated for high energy density capacitor applications where glass has been used as amorphous matrix having high breakdown field and ferroelectric particles as high dielectric constant materials [9][10]. These systems are analogous to the polymer-ceramic composites where PVDF acts as amorphous/semi-crystalline matrix and functional ceramics as fillers, among them (35 vol%) Ba 0.5 Sr 0.5 TiO 3 (BST)-(65 vol%) PVDF nanocomposites displayed energy density in the range of ~9.7 J/cm 3 [11]. [13].…”

Tuning Ferroelectric Response of Electroactive Materials by Controlling Multilayered Structures to Achieve Excellent Energy Storage Performance

“…electrically active form. To further raise the permittivity (K ), high-K ceramic nanoparticles (NPs) are introduced into polymer matrix forming nanocomposites, such as barium titanate (BT), [15,16] titanium oxide, [16,17] and barium strontium titanate [18,19] among others. The permittivity of the nanocomposites is influenced by many factors, such as the permittivity of nanoparticles and polymer matrix, the mass fraction of nanoparticles in the matrix, and so on.…”