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    ASSYMETRIC POROUS MEMBRANE
    1.
    发明公开
    ASSYMETRIC POROUS MEMBRANE 审中-公开

    公开(公告)号：US20230155253A1

    公开(公告)日：2023-05-18

    申请号：US17918571

    申请日：2021-04-16

    申请人： Celgard, LLC

    发明人： Wenbin Yin ,  Daniel R. Alexander ,  Stefan Reinartz ,  Kang Karen Xiao ,  Hisashi Takeda ,  Allen M. Donn

    IPC分类号： H01M50/489 ,  H01M50/457 ,  H01M50/417 ,  H01M50/434

    CPC分类号： H01M50/489 ,  H01M50/417 ,  H01M50/434 ,  H01M50/457

    摘要： Disclosed herein is an asymmetric porous membrane having two outer layers and at least one inner layers. The outer layers may be asymmetric in thickness, pore size, porosity, tortuosity, or combinations thereof. In some embodiments, the asymmetric porous membrane has two outer layers and no inner layers. The thickness of one of the outer layers to the other of the outer layers is from 1.1 to 25:1, preferably from 1.1:1 to 10:1, 1.1:1 to 5:1 or 4:1 to 10:1. In some embodiments, both outer layers are PP-containing layers and in some embodiments, one outermost layer may be a PE-containing layer and the other may be a PP-containing layer. The asymmetric porous membrane may be used as or to make a battery separator. In some embodiments, the battery separator may include an asymmetric porous membrane having the thinner of the two outer layers or the layer facing the anode coated with a coating such as a ceramic coating. The battery separator may be used in a liquid electrolyte secondary battery. In the battery, the thicker of the outer layers and/or the PP-containing layer faces or is closest to the cathode and the thinner of the two outer layers and/or the PE-containing layer faces or is closest to the anode. The outer layer facing the anode may be coated with a coating such as a ceramic coating. The battery separators described herein may have electrochemical stability voltage equal to or above 4.2 v.s. Li/Li+.

    BATTERY SEPARATORS, COATED BATTERY SEPARATORS, BATTERIES, AND RELATED METHODS
    2.
    发明申请
    BATTERY SEPARATORS, COATED BATTERY SEPARATORS, BATTERIES, AND RELATED METHODS 有权

    公开(公告)号：US20210257701A1

    公开(公告)日：2021-08-19

    申请号：US17054196

    申请日：2019-05-10

    申请人： CELGARD, LLC

    发明人： Kang Karen Xiao ,  Allen M. Donn ,  Stefan Reinartz ,  Changqing Wang Adams ,  Masaaki Okada ,  Brian R. Stepp ,  Eric Robert White ,  Katharine Chemelewski

    IPC分类号： H01M50/449 ,  H01M50/423 ,  H01M50/46 ,  H01M10/0525 ,  H01M50/417

    摘要： A new or improved microporous monolayer, bilayer, trilayer, or multilayer membrane, separator membrane, separator, or coated separator is disclosed. The membrane is preferably made up of at least one resin or polymer and at least one additive. The additive may comprise at least one material that improves adhesion of the microporous membrane to a coating, including a polyaramid-containing coating and a PCS coating, or to a different material such as a metallic surface, including an electrode surface. Improvements in adhesion are based on comparisons to similar microporous membranes without the at least one additive. In some preferred embodiments, the at least one additive may comprise, consist of, or consist essentially of a functionalized polymer or the combination of a functionalized polymer and an elastomer. In some embodiments, the functional group of the functionalized polymer may be maleic anhydride (MAH). Also disclosed is a battery separator or coated separator comprising the new or improved microporous membrane. The battery separator may comprise the microporous membrane coated with a polyaramid-containing coating. Also disclosed is a new or improved separator, composite, battery, secondary lithium ion battery, and/or vehicle or device comprising the separator, composite, or battery.