Anhydrous system-based high-conductivity and long-lifetime electrolyte for aluminum electrolytic capacitor and preparation method of anhydrous system-based high-conductivity and long-lifetime electrolyte

The invention relates to the technical field of electrolytes, in particular to an anhydrous system-based high-conductivity and long-lifetime electrolyte for an aluminum electrolytic capacitor and a preparation method of the anhydrous system-based high-conductivity and long-lifetime electrolyte. The electrolyte is prepared from the following raw materials in parts by weight: 30-50 parts of solute, 0.5-1.5 parts of an additive and 50-70 parts of an organic solvent; and the solute is a mixture formed by 1,3-dimethyl imidazole and dimethyl phosphate at the molar ratio of (0.8-1.2) to (0.8-1.2). According to the electrolyte provided by the invention, by interaction of the raw materials and strictly controlling the weight proportions of the raw materials, the breakdown voltage of the prepared electrolyte can reach 85V; the conductivity can reach 14.2ms/cm; the moisture content is lower than 300PPm; and the high-conductivity and long-lifetime electrolyte has good electrochemical properties, has the advantages of hig