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Enhancement of Energy Storage Performances in PMMA/PVDF Nanocomposites with Low Dielectric Bismuth Carbonate Nanosheets
journal contributionposted on 2022-12-15, 12:03 authored by XiaoYa Hao, Qiong Fu, YaFei Hou, YuanJie Yan, TingYu Fu, Jing Cuan, Peng Du, LaiHui Luo, WeiPing Li
Both high discharge energy density (Ud) and charge–discharge efficiency (η) for nanocomposites are crucial to the development and application of modern electronic devices. However, the large dielectric contrast and ferroelectric phase greatly limit the improvement of Ud and η of poly(vinylidene fluoride) (PVDF)-based nanocomposites. Herein, Bi2O2CO3 (simplified as BOC) nanosheets with low dielectric constant and wide bandgaps and linear poly(methyl methacrylate) (PMMA) were filled into PVDF by solution casting to fabricate x vol % BOC/PAPF (PAPF is short for PMMA/PVDF) nanocomposites. The contributions of BOC nanosheets and linear PMMA, especially for the BOC nanosheet, have been systematically studied. Both experimental and simulation results show that BOC nanosheet and PMMA could improve the breakdown strength and reduce the dielectric loss and leakage current of nanocomposites simultaneously, realizing Ud and η improvement at the same time. As a result, the 1.0 vol % BOC/PAPF nanocomposite shows the highest energy storage performance with Ud = 13.68 J/cm3 and η = 85.72%, which is much superior to PVDF. Therefore, this study might provide a proof-of-concept for constructing nanocomposites with excellent Ud and η concurrently.
study might providesimulation results showmodern electronic devicesenergy storage performanceslow dielectric constantlarge dielectric contrastpmma could improvepapf nanocomposite shows sub >)3 sub2 sub3 sup subdielectric lossx u >< subwide bandgapssystematically studiedsolution castingmuch superiorlinear pmmaleakage currentbreakdown strength72 %,68 j