Lithium-supplementing composite diaphragm, preparation method and application

Lithium-supplementing composite diaphragm, preparation method and application

  • CN 105,932,206 B
  • Filed: 07/13/2016
  • Issued: 08/28/2020
  • Est. Priority Date: 07/13/2016
  • Status: Active Grant
First Claim
Patent Images

1. A preparation method of a lithium-supplement composite diaphragm is characterized by comprising the following steps:

  • the method comprises the following steps;

    1) preparation of ceramic slurryAdding ceramic powder, a polyacrylate compound and a binder A into a solvent, and uniformly mixing to obtain ceramic slurry;

    2) preparation of lithium supplement slurryAdding metal lithium powder and a binder B into a solvent, and uniformly mixing to obtain lithium supplement slurry;

    3) coating ceramic slurry and lithium supplement slurry on the base film, and drying to obtain the lithium ion battery;

    the lithium supplement composite diaphragm comprises a base film, wherein a ceramic layer is arranged on one side of the base film, and a ceramic-lithium supplement layer is arranged on the other side of the base film;

    the ceramic-lithium supplement layer consists of a ceramic layer and a lithium supplement layer, and the ceramic layer and the lithium supplement layer are sequentially arranged along the surface of the base film outwards;

    the lithium supplement layer comprises metal lithium powder;

    the lithium supplement layer comprises the following components in percentage by mass;

    50% -70% of lithium metal powder and 30% -50% of binder B;

    the binder B is nitrile rubber;

    the ceramic layer comprises the following components in percentage by mass;

    30-54.5% of ceramic powder, 18.2-30% of polyacrylate compound and 27.3-40% of binder A;

    the binder A is nitrile rubber;

    the thickness ratio of the base film to the ceramic-lithium supplement layer is 20-21;

    3-4.5;

    the thickness ratio of the ceramic layer to the lithium supplement layer in the ceramic-lithium supplement layer is 2;

    1;

    the ceramic powder is aluminum oxide;

    the thickness ratio of the ceramic layer to the ceramic-lithium supplement layer is 1;

    1;

    the polyacrylate compound is polymethyl methacrylate.

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