Phosphate solid electrolyte dispersion liquid as well as preparation method and application thereof

The invention relates to the technical field of lithium ion batteries, in particular to phosphate solid electrolyte dispersion liquid as well as a preparation method and application thereof. The dispersion liquid provided by the invention contains phosphate solid electrolyte, a dispersing agent and water, in the dispersion liquid, the content of the phosphate solid electrolyte is greater than or equal to 40wt%; wherein the particle size span A of the dispersion liquid is smaller than or equal to 1.5, A = (D90-D10)/D50, D50, D90 and D10 are the volume particle sizes of phosphate solid electrolyte particles in the dispersion liquid respectively, and the unit is nm. The dispersion liquid provided by the invention has excellent dispersity, stability and consistency; meanwhile, when the dispersion liquid is used for the lithium ion battery, the performance of the battery can be effectively improved. 本发明涉及锂离子电池技术领域，具体涉及一种磷酸盐固态电解质分散液及其制备方法及其应用。本发明提供的分散液含有磷酸盐固态电解质、分散剂和水；所述分散液中，所述磷酸盐固态电解质的含量≥40wt%；其中，所述分散液的粒径跨度A≤1.5，A