Nanocomposite dielectric film material for energy storage prepared by vertical self-assembly of lead zirconate titanate and magnesium oxide, and preparation method thereof

A method for preparing a nanocomposite dielectric film material for energy storage prepared by vertical self-assembly of lead zirconate titanate (PZT) and magnesium oxide (MgO), comprising:

• step 1, preparing a PZT powder;
• step 2, mixing the PZT powder obtained in step 1 with an MgO powder to obtain a mixed PM composite powder;
• and
• mixing the PM composite powder with a binder to obtain a mixture;
• and subjecting the mixture to tableting and cold isostatic pressing to obtain a PM composite target blank;
• step 3, sintering the PM composite target blank obtained in step 2 at a temperature of not higher than 900° C. to obtain a PM composite target;
• and
• step 4, subjecting the PM composite target obtained in step 3 to pulsed laser deposition to form an epitaxial vertical self-assembly composite dielectric film;
• and subjecting the epitaxial vertical self-assembly composite dielectric film to annealing to obtain the nanocomposite dielectric film material for energy storage, wherein during the pulsed laser deposition, an ordered structure is spontaneously formed by a PZT phase and an MgO phase, and the ordered structure is then deposited to form the epitaxial vertical self-assembly composite dielectric film.