Surface Strengthening of Polymer Composite Dielectrics for Superior High‐Temperature Capacitive Energy Storage

Abstract Polymer dielectrics for high‐temperature capacitive energy storage suffer from low energy density and poor efficiency, which is mainly attributed to the exponential growth of conduction loss at high electric fields. Here, a surface strengthening strategy to inhibit the electrode‐limited conduction loss of polymer composite dielectrics is reported. The surface phase of polymer composite dielectrics is strengthened by the in situ generated ultrafine silicon oxide (SiO 2 ) nanoparticles while the bulk phase is strengthened by incorporating commercially available SiO 2 nanoparticles. These wide bandgap SiO 2 nanoparticles can not only restrict the movement of macromolecular chains, but also act as deep…

• NN
  National Natural Science Foundation of China

  Awards: 52007060, T2222025, 51821004, 51937007, 62174053
• NK
  National Key Research and Development Program of China

  Award: 2021YFB2401503