Preparation method of composite solid electrolyte diaphragm

By preparing an inorganic solid electrolyte and PEO liquid mixture in a lithium-ion battery, coating and rolling it to form a composite solid electrolyte membrane, the problems of increased cost and thickness due to the use of organic solvents are solved, and high energy density and improved stability are achieved.

CN122091706APending Publication Date: 2026-05-26HANGZHOU SKYRICH POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU SKYRICH POWER CO LTD
Filing Date
2026-02-28
Publication Date
2026-05-26

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Abstract

The invention relates to a preparation method of a composite solid electrolyte diaphragm. The method is characterized by comprising the following steps: A, preparing a positive electrode side composite electrolyte I mixture: fully dispersing a colloidal PEO liquid subjected to heat treatment, antioxidant inorganic solid electrolyte powder, metal oxide powder and a functional additive at a high speed to form a uniform mixture; b, preparing a negative electrode side composite electrolyte II mixture: fully dispersing the colloidal PEO liquid subjected to heat treatment, anti-reduction inorganic solid electrolyte powder and a functional additive at a high speed to form a uniform mixture; c, the positive electrode side composite electrolyte I mixture and the negative electrode side composite electrolyte II mixture are coated on the two sides of an ultrathin high-porosity flexible film with the thickness of 3-9 micrometers respectively, the coating thickness is 1-30 micrometers, cooling and curing are conducted, and a diaphragm is obtained; and D, carrying out rolling treatment on the cured diaphragm to obtain the composite solid electrolyte diaphragm. The process is simple, and no organic solvent is used.
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Citation Information

Patent Citations

  • Preparation method of high-density and high-ionic conductivity electrolyte diaphragm for all-solid-state battery

    CN111900310A

  • PEO-based organic-inorganic composite solid electrolyte membrane and preparation method thereof

    CN120432622A