Sandwich-structured dielectric materials for pulse energy storage as well as preparation method and application thereof

A method of preparing a sandwich-structured dielectric material for pulse energy storage, wherein, comprising the following steps:

• (1) dispersing BaxSr1-xTiO3 powder in ethyl alcohol, adding glacial acetic acid and polyvinylpyrrolidone, mixing uniformly, then adding ethyl orthosilicate to adjust pH, reacting at 30-60° C. with stirring for 12-24 hours, getting a suspension, which is filtered and dried to get BST@SiO2 powder;
• wherein x represents the molar fraction of Ba, 0.2≤x≤0.6, and BST@SiO2 identifies a core-shell structure with BST as a core of the core-shell structure and SiO2 as a shell of the core-shell structure;
• (2) mixing the BST@SiO2 powder with a binder uniformly, molding at 150-200 MPa, discharging, and finally calcining at 1100-1200° C. to get ceramic blocks;
• (3) mixing SiO2, BaCO3, B2O3 and Al2O3, ball-milling uniformly, then sieving, drying, melting at 1400-1500° C. for 2-4 hours, quenching, to get frits;
• adding water into the frits and then ball-milling and drying again, to get AF45 glass;
• wherein the chemical composition of the AF45 glass in molar contents is 63% SiO2-12% BaO-16% B2O3-9% Al2O3;
• (4) adding the AF45 glass and carboxymethyl cellulose into water, to get AF45 glass paste, which is spin-coated onto both sides of ceramic blocks, dried and then calcined, to get a sandwich-structured material of glass-ceramic-glass.