Polymer composite membrane, preparation method thereof and lithium ion battery comprising polymer composite membrane

Polymer composite membrane, preparation method thereof and lithium ion battery comprising polymer composite membrane

  • CN 108,242,522 B
  • Filed: 12/23/2016
  • Issued: 09/03/2021
  • Est. Priority Date: 12/23/2016
  • Status: Active Grant
First Claim
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1. A polymer composite membrane, comprising a porous base membrane and a heat-resistant layer having a fiber network structure formed on at least one side surface of the porous base membrane by electrospinning;

  • wherein the porous base membrane is a polymer base membrane, and the polymer base membrane is a polyolefin diaphragm;

    the heat-resistant layer comprises a heat-resistant polymer material, the heat-resistant polymer material is a mixture of poly (m-phenylene isophthalamide) and other heat-resistant materials, and the other heat-resistant materials are one or more selected from poly (p-phenylene terephthalamide), poly (p-benzamide), poly (p-phenylene benzobisoxazole), poly (phenylene benzobisthiazole), polybenzoxazole, polybenzimidazole, polyether ether ketone and polybenzoxazole;

    the weight ratio of the polyisophthaloyl metaphenylene diamine to the other heat-resistant materials is 1;

    (0.1 to

         10);

    wherein the heat-resistant polymer material is contained in an amount of 80 wt% or more based on the total weight of the heat-resistant layer;

    the thickness of the heat-resistant layer is 0.5-3 mu m; and

    the porosity of the heat-resistant layer is 79%About 86.3 percent and the surface density of 3 to 6g/m2

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