Organic-inorganic composite solid electrolyte material and preparation method and application thereof

Abstract

The invention belongs to the technical field of battery preparation, and particularly relates to an organic-inorganic composite solid electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing lithium carbonate, lanthanum oxide, zirconium oxide, aluminum oxide and gallium oxide, and carrying out ball milling and sintering to obtain a lithium lanthanum zirconium oxide precursor; wherein the mole number of the aluminum oxide is greater than or equal to that of the gallium oxide, and the ratio of the total mole number of the aluminum oxide and the gallium oxide to the mole number of the zirconium oxide is (0.5-0.6): 2; (2) mixing the lithium lanthanum zirconium oxide precursor, a polyoxyethylene lithium salt solution and a metal precursor salt to obtain a spinning solution; (3) spinning the spinning solution, and calcining in sections to obtain a lithium lanthanum zirconium oxide nanowire; and (4) mixing the lithium lanthanum zirconium oxide nanowire with a polyoxyethylene solution, and drying to obtain the organic-inorganic composite solid electrolyte. The electrolyte prepared by the preparation method is excellent in performance, the electrochemical window of the lithium battery based on the electrolyte can reach 5.8 V, and the cycle life is greatly prolonged.

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