Significantly improved dielectric and energy storage behavior of the surface functionalized CaCu3Ti4O12 nanoparticles in PVDF-CaCu3Ti4O12 nanocomposites

Kaur, Shobhneek; Singh, Dwijendra P.

doi:10.1016/j.jallcom.2022.165500

Cited by 13 publications

(4 citation statements)

References 39 publications

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“…(a) D – E loops and (b) discharged energy density ( U d ) and charge–discharge efficiency (η) of PVDF and PVDF-based composite films and (c) comparison of enhancement ratio of U d in this work with other reported PVDF-based dielectric composites. ,,,,,,− …”

Section: Resultsmentioning

confidence: 87%

“…As for η, it decreases with the increase of applied electric field due to the hysteresis in the polarization, while AO@BT-BNNSs/PVDF has a relatively low energy loss since BNNSs can reduce leakage current effectively. The comparison of this work and some reported PVDF-based dielectric composites is summarized in Figure c. ,,,,,,− The enhancement ratio of U d , which is defined as ( U dcomposites / U dPVDF – 1) × 100%, is utilized to eliminate the difference in inherent structure and properties of the polymer matrix . It is noteworthy that a higher enhancement ratio of U d has been achieved in this study at relatively low content of designed hybrid fillers.…”

Section: Resultsmentioning

confidence: 90%

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Synergistic Effect of Al₂O₃@BaTiO₃–BNNSs Hybrid Fillers for Improved Energy Storage and Thermal Conductivity Properties of PVDF-Based Composites

Deng,

Hu,

Meng

et al. 2024

ACS Appl. Polym. Mater.

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Motivated by growing energy demands, dielectric materials with improved energy storage density and thermal conductivity are highly desirable. In this paper, hybrid fillers composed of BaTiO 3 nanofibers, Al 2 O 3 nanoparticles, and hexagonal boron nitride nanosheets (BNNSs) were utilized to prepare different poly(vinylidene fluoride) (PVDF)-based composite films. The effects of hybrid filler nanostructures on the comprehensive properties of composite films are investigated systematically. The designed Al 2 O 3 @BaTiO 3 nanofibers (AO@BT NFs) and BNNSs are constructed for the synergistic enhancement of breakdown strength and thermal conductivity. Consequently, PVDF composite films with 1.5 vol % AO@BT NFs and 4.0 vol % BNNSs exhibit the highest energy storage density of 8.3 J/cm 3 at 353.9 kV/mm, along with a thermal conductivity of 0.508 W/(m•K), which are 2.86 and 2.85 times those of the pristine PVDF, respectively. This work provides a convenient and effective strategy for flexible energy storage materials with designed hybrid fillers, which show potential applications in high-performance dielectric capacitors.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 90%

Synergistic Effect of Al₂O₃@BaTiO₃–BNNSs Hybrid Fillers for Improved Energy Storage and Thermal Conductivity Properties of PVDF-Based Composites

Deng,

Hu,

Meng

et al. 2024

ACS Appl. Polym. Mater.

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“…First, the loss of both schemes increased slowly with the increase in the doping concentration of high-entropy spinel ferrite. This is due to the formation of many interfaces in the nanocomposite film, in turn leading to additional dipole relaxation and increasing the tangential loss [45]. In addition, as the doping concentration rises, the high entropy spinel ferrite is more prone to agglomeration in PVDF substrates, which causes more loss.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Field Effects on the Structure, Dielectric and Energy Storage Properties of High-Entropy Spinel Ferrite (La0.14Ce0.14Mn0.14Zr0.14Cu0.14Ca0.14Ni0.14)Fe2O4/PVDF Nanocomposites

Qiao

Liu

et al. 2023

Polymers

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Energy depletion is one of the significant threats to global development. To increase the usability of clean energy, the energy storage performance of dielectric materials must be urgently enhanced. Semicrystalline ferroelectric polymer (PVDF) is the most promising candidate for the next generation of flexible dielectric materials thanks to its relatively high energy storage density. In this work, high-entropy spinel ferrite (La0.14Ce0.14Mn0.14Zr0.14Cu0.14Ca0.14Ni0.14Fe2O4) nanofibers (abbreviated 7FO NFs) were prepared by the sol-gel and electrostatic spinning methods, then blended with PVDF to prepare composite films using the coating method. A magnetic field was used to control the orientation distribution of the high-entropy spinel nanofibers in the PVDF matrix. We investigated the effects of the applied magnetic field and the content of high-entropy spinel ferrite on the structure, dielectric, and energy storage properties of the PVDF substrate films. The 3 vol% 7FO/PVDF film treated in a 0.8 T magnetic field for 3 min exhibited a good overall performance. The maximum discharge energy density was 6.23 J/cm3 at 275 kV/mm and the efficiency was 58% with 51% β-phase content. In addition, the dielectric constant and dielectric loss were 13.3 and 0.035, respectively, at a frequency of 1 kHz.

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“…The polar β-phase produces a net dipole moment almost perpendicular to the polymer chains, pointing from electronegative fluorine to positively charged hydrogen, and these chains can crystallize into a quasi-hexagonal, tightly packed β-phase structure in which the dipoles of all chains are aligned, with better piezoelectric effects, pyroelectric effects, and higher initial polarization, but with a large residual polarization affecting energy storage [ 29 , 30 ]. Many studies have shown that the polar γ-phase can be seen as an intermediate between the α-phase and β-phase, with ferroelectric effects favoring energy storage [ 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of High-Entropy Spinel Ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 Doping Concentration on the Ferroelectric Properties of PVDF-Based Polymers

Qiao

Liu

et al. 2023

Polymers

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Polyvinylidene fluoride (PVDF)-based dielectric energy storage materials have the advantages of environmental friendliness, high power density, high operating voltage, flexibility, and being light weight, and have enormous research value in the energy, aerospace, environmental protection, and medical fields. To investigate the magnetic field and the effect of high-entropy spinel ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 nanofibers (NFs) on the structural, dielectric, and energy storage properties of PVDF-based polymers, (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 NFs were prepared via the use of electrostatic spinning methods, and (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4/PVDF composite films were prepared via the use of the coating method. The effects of a 0.8 T parallel magnetic field, induced for 3 min, and the content of high-entropy spinel ferrite on the relevant electrical properties of the composite films are discussed. The experimental results show that, structurally, the magnetic field treatment causes the originally agglomerated nanofibers in the PVDF polymer matrix to form a linear fiber chain with different fiber chains parallel to each other along the magnetic field direction. Electrically, the introduction of the magnetic field enhanced the interfacial polarization, and the (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4/PVDF composite film with a doping concentration of 10 vol% had a maximum dielectric constant of 13.9, as well as a low energy loss of 0.068. The high-entropy spinel ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 NFs and the magnetic field influenced the phase composition of the PVDF-based polymer. The α-phase and γ-phase of the cohybrid-phase B1 vol% composite films had a maximum discharge energy density of 4.85 J/cm3 and a charge/discharge efficiency of 43%.

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Significantly improved dielectric and energy storage behavior of the surface functionalized CaCu3Ti4O12 nanoparticles in PVDF-CaCu3Ti4O12 nanocomposites

Cited by 13 publications

References 39 publications

Synergistic Effect of Al₂O₃@BaTiO₃–BNNSs Hybrid Fillers for Improved Energy Storage and Thermal Conductivity Properties of PVDF-Based Composites

Synergistic Effect of Al₂O₃@BaTiO₃–BNNSs Hybrid Fillers for Improved Energy Storage and Thermal Conductivity Properties of PVDF-Based Composites

Magnetic Field Effects on the Structure, Dielectric and Energy Storage Properties of High-Entropy Spinel Ferrite (La0.14Ce0.14Mn0.14Zr0.14Cu0.14Ca0.14Ni0.14)Fe2O4/PVDF Nanocomposites

Effect of High-Entropy Spinel Ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 Doping Concentration on the Ferroelectric Properties of PVDF-Based Polymers

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Significantly improved dielectric and energy storage behavior of the surface functionalized CaCu3Ti4O12 nanoparticles in PVDF-CaCu3Ti4O12 nanocomposites

Cited by 13 publications

References 39 publications

Synergistic Effect of Al2O3@BaTiO3–BNNSs Hybrid Fillers for Improved Energy Storage and Thermal Conductivity Properties of PVDF-Based Composites

Synergistic Effect of Al2O3@BaTiO3–BNNSs Hybrid Fillers for Improved Energy Storage and Thermal Conductivity Properties of PVDF-Based Composites

Magnetic Field Effects on the Structure, Dielectric and Energy Storage Properties of High-Entropy Spinel Ferrite (La0.14Ce0.14Mn0.14Zr0.14Cu0.14Ca0.14Ni0.14)Fe2O4/PVDF Nanocomposites

Effect of High-Entropy Spinel Ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4 Doping Concentration on the Ferroelectric Properties of PVDF-Based Polymers

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Synergistic Effect of Al₂O₃@BaTiO₃–BNNSs Hybrid Fillers for Improved Energy Storage and Thermal Conductivity Properties of PVDF-Based Composites

Synergistic Effect of Al₂O₃@BaTiO₃–BNNSs Hybrid Fillers for Improved Energy Storage and Thermal Conductivity Properties of PVDF-Based Composites