Wide Band Gap Boron Nitride Nanodots‐Incorporated Polyetherimide Dielectrics for High‐Temperature Dielectric Energy Storage

, respectively, with η of 85% and 82%. In summary, this study demonstrates the existence of strong π-π conjugated interactions between BNNDs and PEI molecular chains. Consequently, BNNDs can intercalate between PEI molecular chains, replacing the π-π conjugation between these chains, thereby enhancing the high-temperature performance of aromatic dielectric polymers.