Preparation method of solid electrolyte and solid-state battery

[0035] This embodiment provides a solid electrolyte and a method for preparing the solid electrolyte, the method comprising the following steps:

[0036] S1, add LiOH, metal oxide, oxalic acid, and additives into the ethanol solution in sequence, and then stir for not less than 30 minutes to obtain a mixture, in which the metal oxide is La 2 o 3 and ZrO 2 It is formulated at a mass ratio of 1:1, and the additives are zirconium dioxide and polyethylene at a mass ratio of 1:10;

[0037] S2, the mixture prepared in S1 is subjected to evaporative crystallization treatment to obtain a mixed material, and an alkali metal halide of the LiCl-KCl system is added to the mixed material, and then ground, and after the grinding is uniform, high-temperature roasting is carried out, and the high-temperature roasting includes primary roasting and secondary roasting. Roasting, the temperature of the first roasting is 400°C, and the time of the first roasting is not less than 12h. After the f...

[0043] This embodiment provides a method for preparing a solid electrolyte, the method comprising the following steps:

[0044] S1, will Li 2 CO 3 , Al2O3, oxalic acid, and additives are added to the methanol solution in sequence, and then stirred for no less than 30 minutes to obtain a mixture. The additives are zirconium dioxide and polyvinylidene fluoride in a mass ratio of 1:10;

[0045] S2, the mixture prepared in S1 is subjected to evaporative crystallization treatment to obtain a mixed material, and the alkali metal halide of the LiF-LiCl-LiBr system is added to the mixed material, and then ground, and then high-temperature roasting is carried out after the grinding is uniform, and the high-temperature roasting includes one roasting And the second roasting, the temperature of the first roasting is 800°C, the time of the first roasting is not less than 12h, after the completion of the first roasting, the temperature is raised immediately for the second roasting, the tem...