Enhancement of Energy Storage Performances in PMMA/PVDF Nanocomposites with Low Dielectric Bismuth Carbonate Nanosheets

Abstract

Both high discharge energy density (U d ) 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 U d and η of poly(vinylidene fluoride) (PVDF)-based nanocomposites. Herein, Bi 2 O 2 CO 3 (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 U d and η improvement at the same time. As a result, the 1.0 vol % BOC/PAPF nanocomposite shows the highest energy storage performance with U d = 13.68 J/cm 3 and η = 85.72%, which is much superior to PVDF. Therefore, this study might provide a proof-of-concept for constructing nanocomposites with excellent U d and η concurrently.

Enhancement of Energy Storage Performance of PMMA/PVDF Composites by Changing the Crystalline Phase through Heat Treatment

“…This demonstrates that PVDF and PMMA have high miscibility and compatibility. Previous research [31][32][33] found that the two polymers, PVDF and PMMA, have very similar solubility parameters of 22.7 and 23.2 [34], respectively. Moreover, their compatibility with each other is excellent.…”

Energy storage enhancement of sandwich-structured nanocomposites with mono/adjacent-layer design and their synergistic effect optimization

“…From the cross-sectional image (figure 2(d)), no obvious holes or defects could be observed in the 0 wt.% Ni(OH) 2 BPB nanocomposite, and Ni(OH) 2 absence in middle layer indicates successfully preparing the sandwich-structured nanocomposite. Meanwhile, the dense structure of x wt.% Ni(OH) 2 BPB nanocomposites (figure S3) might help to prevent premature localized breakdown at the gaps [4]. Therefore, the prepared nanocomposites have a high quality, indicating their potential for high energy storage performances.…”

“…With modern electronic technology advancement, the demand for dielectric capacitors possessing high discharge energy density (U d ) and charge-discharge efficiency (η) has rapidly increased [1][2][3][4][5][6]. However, compared with other energy storage devices [7,8], the current polymer dielectric materials * Authors to whom any correspondence should be addressed.…”

Broadband dielectric behaviour and structural characterization of PVDF/PMMA/OMMT polymer nanocomposites for promising performance nanodielectrics in flexible technology advances

“…Study of complex dielectric permittivity ε * = εʹ−jε″ over the broadband frequency range of the PNC materials is highly meaningful to understand the various polarization and dynamical processes in the complex system, and also to explore their uses as innovative nanodielectrics in the design and development of flexible type microelectronic devices [1, 3−6, 15, 24, 41, 53, 57-60]. In addition to this, with the help of laboratory measured experimental values of the dielectric parameters at different frequencies, the applications of such nanodielectric materials can be fixed as prominent energy storage and insulator materials in the harmonic electric field operative electronic devices [3,12,57,58,60,61]. The measured dielectric permittivity (i.e.…”