Enhancing Energy Density of BaTiO<sub>3</sub>-Bi(M)O<sub>3</sub>@SiO<sub>2</sub>/PVDF Nanocomposites via Filler Component Modulation and Film Structure Design
The low energy density (<i>U</i><sub>d</sub>) of polymeric dielectrics is unfavorable for the integration and miniaturization of electronics, thus limiting their application prospects. Introducing high-<i>ε</i><sub>r</sub> (dielectric constant) ceramic...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/8/569 |
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| Summary: | The low energy density (<i>U</i><sub>d</sub>) of polymeric dielectrics is unfavorable for the integration and miniaturization of electronics, thus limiting their application prospects. Introducing high-<i>ε</i><sub>r</sub> (dielectric constant) ceramic nanofillers to polymer matrices is the most common strategy to enhance their <i>ε</i><sub>r,</sub> and hence their <i>U</i><sub>d</sub>. By comparison, enhancing breakdown strength (<i>E</i><sub>b</sub>) is a more effective strategy to enhance <i>U</i><sub>d</sub>. Herein, 0.6BaTiO<sub>3</sub>-0.4Bi(Mg<sub>0.5</sub>Ti<sub>0.5</sub>)O<sub>3</sub> and 0.85BaTiO<sub>3</sub>-0.15Bi(Mg<sub>0.5</sub>Zr<sub>0.5</sub>)O<sub>3</sub> nanofibers coated with SiO<sub>2</sub> were utilized as fillers in PVDF-based nanocomposites. The combination of experimental and simulation results suggests that the intrinsic properties of nanofillers are the determining factor of the <i>E</i><sub>b</sub> of polymer-based nanocomposites, and SiO<sub>2</sub> coating and film structure design are effective strategies to enhance their <i>E</i><sub>b</sub>, and consequently their <i>U</i><sub>d</sub>. As a result, the sandwich-structured PVDF/6 wt% 0.85BaTiO<sub>3</sub>-0.15Bi(Mg<sub>0.5</sub>Zr<sub>0.5</sub>)O<sub>3</sub>@SiO<sub>2</sub> nanofiber within PVDF/PVDF nanocomposite films achieved a maximum <i>U</i><sub>d</sub> of 11.1 J/cm<sup>3</sup> at an <i>E</i><sub>b</sub> of 458 MV/m, which are 2.15 and 1.40 times those of pristine PVDF, respectively. |
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| ISSN: | 2079-4991 |