POLYOLEFIN MICRO-POROUS FILM AND POWER-STORAGE DEVICE

    公开(公告)号:US20220102811A1

    公开(公告)日:2022-03-31

    申请号:US17418152

    申请日:2019-12-26

    摘要: This polyolefin micro-porous film includes a multilayered structure, wherein the multilayered structure contains a first layer composed of polypropylene resin, a second layer composed of polyethylene resin and provided on the first layer, and a third layer composed of polypropylene resin and provided on the second layer. Furthermore, a thickness of the first layer is thinner than a thickness of the second layer, a thickness of the third layer is thinner than the thickness of the second layer, and in the multilayered structure, a thickness is 16 μm or less, a porosity is 40 to 70%, and a surface opening ratio is 10 to 30%.