Abstract
Simultaneous enhancement in dielectric constant and electric breakdown strength is the desired way for polymer-based dielectric materials to achieve a high discharge energy density. Herein, an artificial gradient trilayered polymer nanocomposite with remarkable energy storage performance is proposed. Two-dimensional Sr2Nb2O7 nanosheets (SNO NSs) functionalized with polydopamine and Ag-quantum-dots (D-SNO@Ag NSs) are introduced into a poly(vinylidene fluoride)/polymethyl methacrylate (PVDF/PMMA) blend polymer matrix (BPM). Attributed to the incorporation of Ag-quantum-dots (Ag QDs) on the surface of SNO NSs, the local capacitance around SNO NSs is improved and the electron migration near the Ag QDs is inhibited. As a result, a large Weibull breakdown strength (585.13 MV m−1) and an enhanced dielectric constant (13.98) was obtained to achieve a high difference between electric displacement and remnant electric displacement (12.98 μC cm−2 at 580 MV m−1) from the gradient trilayered nanocomposite, which contributes a remarkable discharge energy density of 31.0 J cm−3 with a charge–discharge efficiency of 66%.
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