The dielectric capacitor has been widely used in advanced electronic and electrical power systems due to its capability of ultrafast charging-discharging and ultrahigh power density. Nevertheless, its energy density is still limited by the low dielectric constant(≈ 2.2) of the commercial dielectric polypropylene (PP). The conventional enhancement strategy by embedding inorganic fillers in PP matrix is still difficult and challenging due to that PP hardly dissolves in any inorganic/organic solvent. In this work, we develop a new strategy including freeze-drying, surface functionalization, and hot-pressing to incorporate Ti_0.87O₂ monolayers in PP film. A series of uniform composited Ti_0.87O₂@PP film has been successfully fabricated with Ti_0.87O₂ content range of 0–15 wt%. The maximum dielectric constant of the as-prepared Ti_0.87O₂@PP film is 3.27 when the Ti_0.87O₂ content is 9 wt%, which is about 1.5 times higher than that of pure PP. Our study provides a feasible strategy to embed two-dimensional material into commercial PP thin-film with superior dielectric performance for practical application.

介电电容器具有超快的充电和超高功率密度的能力，已被广泛用于高级电子和电力系统中。然而，其能量密度仍然受到商业介电聚丙烯（PP）的低介电常数（≈2.2）的限制。由于PP几乎不溶于任何无机/有机溶剂中，因此将无机填料嵌入PP基体中的常规增强策略仍然困难且具有挑战性。在这项工作中，我们开发了一种新的策略，包括冷冻干燥，表面功能化和热压，以在PP薄膜中掺入Ti _0.87 O ₂单层。一系列均匀复合的Ti _0.87 O ₂@PP膜已成功制备，其Ti _0.87 O _2的含量范围为0–15 wt％。当Ti _0.87 O ₂含量为9 wt％时，所制备的Ti _0.87 O ₂ @PP膜的最大介电常数为3.27 ，约为纯PP的1.5倍。我们的研究提供了一种可行的策略，可以将二维材料嵌入具有优异介电性能的商用PP薄膜中，以供实际应用。