Achieving high energy storage in BaTiO<sub>3</sub>/rGO/PVDF nanocomposites by regulating the charge transfer path at the hetero-interface

Yan

ACS Appl. Electron. Mater.

et al. 2023

The rapid development of the clean energy industry has given great impetus to energy-efficient storage and conversion technologies. Film capacitors have attracted much attention because of their higher charge and release rates, greater energy density, and extended life cycle. But the lower recharging and discharging efficiency and insulation properties pertaining to the electricity used in capacitors limit the improvement of their energy storage performance. In this paper, the addition of the linear polymer polycarbonate (PC) to polyvinylidene fluoride (PVDF) through a blending strategy and the subsequent acquisition of the high-dielectric nanofiller titanium dioxide (TiO2) to the blended matrix is expected to achieve synergistic optimization of the insulation and polarization properties, thereby enhancing the energy storage performance of the mixed media. The findings show that great storage of energy productivity (U e ≈ 11.43 J/cm3, η ≈ 57.08%) is obtained for 40 vol % PC/PVDF-x wt %-TiO2 at an optimum field strength of 450 kV/mm when the TiO2 doping amount x is 0.9 wt %. Compared with pure PVDF, its U e is improved by 2.3 times, η by 1.2 times, and E b by 1.5 times. This research presents a viable answer for applying PVDF-based high-energy-storage film capacitors.

Section: Resultsmentioning

confidence: 99%

Enhanced Energy Storage Performance of Doped Modified PC/PVDF Coblended Flexible Composite Films

Yan

ACS Appl. Electron. Mater.

et al. 2023

“…[18] Except for the role of boosting 𝛽 phase content of PVDF-TrFE composite film, the presence of GaIn droplets as a conductive filler are also helpful for amplifying the local electric field benefitting the higher polarizability of PVDF-TrFE and corresponding piezoelectricity. [19] As discussed above, the oxidation layer thickness has shown a significant effect on the 𝛽 phase content of PVDF-TrFE composite film. It is generally accepted that Ga 2 O 3 shell layer was naturally oxidized from GaIn core as Ga is easier to be oxidized, thus then the electron density gradient would be generated by the change of its thickness.…”

Section: (Supporting Information)mentioning

confidence: 86%

Giant Piezoelectric Output and Stability Enhancement in Piezopolymer Composites with Liquid Metal Nanofillers

Liu,

Zeng,

Zhang

et al. 2023

Advanced Science

Integrating nanomaterials into the polymer matrix is an effective strategy to optimize the performance of polymer‐based piezoelectric devices. Nevertheless, the trade‐off between the output enhancement and stability maintenance of piezoelectric composites usually leads to an unsatisfied overall performance for the high‐strength operation of devices. Here, by setting liquid metal (LM) nanodroplets as the nanofillers in a poly(vinylidene difluoride) (PVDF) matrix, the as‐formed liquid‐solid/conductive‐dielectric interfaces significantly promote the piezoelectric output and the reliability of this piezoelectric composite. A giant performance improvement featured is obtained with, nearly 1000% boosting on the output voltage (as high as 212 V), 270% increment on the piezoelectric coefficient (d33∼51.1 pC N−1) and long‐term reliability on both structure and output (over 36 000 cycles). The design of a novel heterogenous interface with both mechanical matching and electric coupling can be the new orientation for developing high performance piezoelectric composite‐based devices.

“…On the one hand, the improved graphitization of the carbon shell could anchor the carriers around its surface to optimize the charge transfer paths. 24 The charge preferentially migrated along the interface region and the carbon shell (Fig. 8a), which inhibited the development of the conductive path in the polymer matrix, resulting in suppressed conductivity loss of the composites.…”

Section: Dielectric Properties Of the Composite Filmsmentioning

confidence: 99%

“…Therefore, hybrid fillers combining the ceramic fillers with the conductive fillers have been studied, [24][25][26][27][28] which are expected to achieve a high dielectric constant and relatively low dielectric loss at a low filling amount. Constructing a core-shell structure is considered an effective strategy among these hybrid fillers.…”

Section: Introductionmentioning

confidence: 99%

NaCl-treated multiple carbon coating BaTiO₃ nanoparticles towards enhancing dielectric properties

et al. 2023