Lanthanum molybdate-based intermediate-temperature solid oxide fuel cell electrolyte material and preparation method thereof

The invention relates to a lanthanum molybdate-based intermediate-temperature solid oxide fuel cell electrolyte material and a preparation method thereof. The chemical formula of electrolyte materials is La2Mo(2-x)CuxO(9-delta), wherein in the formula, x is larger than 0 and smaller than or equal to 0.6. La2O3, MoO3 and CuO are weighed and added into a mortar with absolute ethyl alcohol as a medium, and grinding is conducted; then the materials are transferred to a crucible, and the crucible with the materials are placed in a muffle furnace for calcination; the materials are taken out and fully ground after being calcined, and finally solid precursor powder is obtained; the precursor powder is taken to be placed in an agate mortar for grinding; a PVA solution is added for grinding and pelletizing; the pelletized product is added into a stainless steel tabletting die and pressed into round slices. Phase transformations of the prepared electrolyte materials are inhibited; a compact ceramic sintered body with th