Improving energy storage properties of polyarylene ether nitrile with coral-like CaCu 3 Ti 4 O 12 nanorods

Film capacitors have attracted widespread attention in the field of power electronics due to their advantages of long service life, high -power density, rapid charging and discharging rates, operational safety, among others. Nonetheless, the persisting challenge regarding the dielectric capacitors ' insufficient energy storage density remains the primary obstacle impeding their advancement. Herein, one -dimensional (1D) coral-like calcium copper titanate (CaCu 3 Ti 4 O 12 ) nanorod (CCTONR) is fabricated and interface modified to enhance energy storage properties of polyarylene ether nitrile (PEN). The CCTONR is fabricated through a two-step hydrothermal reaction followed by calcination, and then modified by KH550 and sulphonated PEN sequentially offering SPEN@CCTONR. Due to the 1D nature and the functionalization of SPEN on the surface of CCTONR, the compatibility and the distribution state of SPEN@CCTONR in the PEN matrix are conspicuously improved. Furthermore, a secondary dispersion of SPEN@CCTONR is achieved in the SPEN@CCTONR/PEN composite via uniaxial hot -stretching. As a result, the dielectric permittivity is increased to 17.96, while the breakdown strength remains 199.4 kV/mm for the stretched SPEN@CCTONR/PEN film with filler content of 15 wt%. Correspondingly, an energy storage density of 3.16 J/cm 3 , with an boosting of 320 % in comparing with that of PEN, is achieved. This stretched SPEN@CCTONR/PEN film with leaped energy storage density would be a promising candidate for future flexible dielectric materials.