Liquid phase preparation method of oxyhalide solid electrolyte

Abstract

The invention discloses a liquid phase preparation method of oxyhalide solid electrolyte, which comprises the following steps: S1, adding oxygen-containing lithium salt and halide into a container, mixing and grinding until a uniform first mixture is obtained; s2, a solvent is added into the first mixture, mixing and stirring are carried out, a first mixed solution is prepared, and the solvent can dissolve oxygen-containing lithium salt and halide; s3, the first mixed solution is crystallized and separated out, separated crystals are ground and subjected to heat treatment, the oxyhalide solid electrolyte is obtained, the chemical general formula of the obtained oxyhalide solid electrolyte is LiaMbOcXd, and a is larger than 0 and smaller than or equal to 4; 0.5 < = b < = 2; 0.5 < = c < = 2; and 3 < = d < = 6. Compared with a high-speed ball milling method, the liquid-phase preparation method disclosed by the invention has the advantages that the energy consumption is remarkably reduced, the reaction uniformity and the material purity are improved, and the crystal structure and the ionic conductivity of the oxyhalide solid electrolyte are optimized through crystallization precipitation.

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