Abstract
Polymer dielectrics possessing the superiorities of easy processing and high power density are widely used in pulsed power and power electronics. However, the low energy storage density (Ue) of polymer dielectrics limits their application in the modern electronic industries. In this work, we present the sea-island structure multilayered composites based on polymethylmethacrylate (PMMA) matrix and polyvinylidene fluoride (PVDF) nanoparticles, which is constructed by the solution blending with typical solubility differences method and the layer-by-layer solution casting method. The PVDF/PMMA composite incorporated with high PVDF content is placed in the middle of the sandwich-structured composite as a non-traditional intermediate polarization layer. The PVDF/PMMA composite with low PVDF loading is placed in the outer layer to improve the insulating property of the composite. The results show that the PVDF/PMMA composites with inner and outer PVDF volume content of 30% and 10%, respectively, obtained an excellent dielectric constant value (εr ~ 4.35), which is 45% higher than that of PMMA (εr ~ 3). Meanwhile, the maximum Ue (~ 4.95 J cm−3) of the PVDF/PMMA composites at an electric field of 422.48 MV m−1 was obtained, which is 207% higher than that of PMMA (Ue ~ 1.61 J cm−3). The improved energy storage capability could be attributed to the introduction of highly polarizing particles, the increased number of heterogeneous interfaces, and the multilayered construction of composite. This work provides a strategy for the preparation of advanced all-organic dielectrics with a higher discharge energy density.
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Funding
We are grateful to the National Natural Science Foundation of China (Grant Nos. 51807163, 51873174, and 51927804) and Natural Science Foundation of Shaanxi Province (No.2022JM-286) for the financial support of this work.
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Y. L. carried out laboratory research and wrote a draft of the manuscript. H. Z. devised the original concept, supervised the work, reviewed and edited the manuscript, and was responsible for project management. L. Y. reviewed and edited the manuscript. J. B. carried out the project administration.
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Liu, Y., Zhao, H., Yin, L. et al. Enhanced energy storage property of all-organic dielectrics by gradient layered design of sea-island structures. Colloid Polym Sci 302, 829–841 (2024). https://doi.org/10.1007/s00396-024-05240-3
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DOI: https://doi.org/10.1007/s00396-024-05240-3