Dielectric constant and breakdown strength are two key factors influencing the energy density of a dielectric material. This paper reports a promising strategy to increase both the dielectric constant and breakdown strength of the PVDF-HFP upon incorporating a low content of silver-deposited exfoliated montmorillonite nanoplatelets (Ag-OMMT). Incorporation of the Ag-OMMT nanoplatelets forms a large number of nanocapacitors, resulting in more interfacial polarization compared to the bare PVDF-HFP under the same applied electric field. Meanwhile, the OMMT nanoplatelets act as the insulating barriers, increasing the breakdown strength of the PVDF-HFP. Consequently, great improvements in the energy storage density are achieved in these dielectric composites. The PVDF-HFP/Ag-OMMT composite film with 4 vol% Ag-OMMT shows an energy density of 10.51 J cm⁻³ at 400 MV m⁻¹, which is ∼ 2.25 times that of the pure PVDF-HFP film.

介电常数和击穿强度是影响介电材料能量密度的两个关键因素。本文报道了一种有前途的策略，可通过掺入低含量的银沉积脱落蒙脱土纳米片（Ag-OMMT）来提高PVDF-HFP的介电常数和击穿强度。Ag-OMMT纳米片的掺入形成了大量的纳米电容器，与在相同施加电场下的裸PVDF-HFP相比，导致更多的界面极化。同时，OMMT纳米片充当绝缘屏障，增加了PVDF-HFP的击穿强度。因此，这些介电复合材料的储能密度大大提高。具有4％体积百分比的Ag-OMMT的PVDF-HFP / Ag-OMMT复合膜的能量密度为10.51 J cm在400 MV m ^-1下为^-3，是纯PVDF-HFP膜的〜2.25倍。