Composite solid-state battery electrolyte, preparation method and all-solid-state lithium battery composed of composite solid-state battery electrolyte

The invention discloses a composite solid-state battery electrolyte, a preparation method and an all-solid-state lithium battery composed of the composite solid-state battery electrolyte. Filler of the composite solid-state battery electrolyte is a nanoscale positive electrode material. The nanoscale positive electrode material is used as an active filler, so that the crystallinity of a polymer can be reduced, and the conductivity of a polymer electrolyte membrane is improved. In addition, the nanoscale positive electrode material (such as lithium iron phosphate) can construct an organic-inorganic interface rapid ion channel in the composite solid electrolyte, so that the ion transmission behavior is enhanced; meanwhile, the composite solid electrolyte has extremely high electrode interface compatibility in an all-solid-state battery composed of the same type of positive electrode materials, the battery capacity and the rate capability are greatly improved, and excellent endurance and fast charge capabilities