COMPOSITE MATERIAL AND PREPARATION METHOD THEREOF

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The present application provides a composite material, and a preparation method thereof. The composite material comprises a first component and a second component in contact with the first component, wherein the first component and the second component are mixed and have a contact interface. The first component comprises hydrogen-containing transition metal oxides, the structural formula of the hydrogen-containing transition metal oxides is ABOxHy, wherein A is one or more of alkaline earth metal elements and rare earth metal elements, B is one or more of transition metal elements, x is in the range of 1-3, and y is in the range of 0-3. The lattice constant of the first component can be effectively adjusted by the injection and extraction of hydrogen ions and oxygen ions. Further, changes to the lattice constant of the first component can influence the lattice constant of the second component by means of the coupling effect of the interface, thereby realizing effective adjustment of the properties of the composite material.