Method for preparing bismuth oxide-lanthanum molybdate composite electrolyte by sol-gel self-combustion method

The invention relates to the technical field of solid electrolyte material preparation, in particular to a method for preparing bismuth oxide-lanthanum molybdate composite electrolyte by a sol-gel self-combustion method. The method comprises the following steps that acidifying is carried out on a mixed solution of lanthanum nitrate and ammonium molybdate by using ethylene glycol, and then stirringand heating are performed to carry out sol-gel reaction to prepare lanthanum molybdate coarse powder; the lanthanum molybdate powder is purified by a self-combustion method, the lanthanum molybdate coarse powder is placed in a crucible to be placed into a muffle furnace for sintering; and solid-phase compounding is carried out on lanthanum molybdate and bismuth oxide, and steps of grinding, tabletting, and finally sintering are carried out to prepare the bismuth oxide-lanthanum molybdate composite electrolyte. When the bismuth oxide and lanthanum molybdate composite electrolyte with the doping ratio of 20% is sintere