Separator for rechargeable battery and rechargeable lithium battery including the same
申请人:SAMSUNG SDI CO., LTD.
公开号:US10707467B2
公开(公告)日:2020-07-07
A separator for a rechargeable battery includes a porous substrate and an adhesive layer on at least one surface thereof. The adhesive layer includes a first binder, a second binder, and a filler. The first binder includes a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene. The structural unit derived from hexafluoropropylene is included in an amount of about 10 wt % or less based on a total weight of the first binder. A weight average molecular weight of the first binder ranges from about 800,000 to about 1,500,000. The second binder includes a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene. The structural unit derived from hexafluoropropylene is included in an amount of 10 wt % or less based on a total weight of the second binder. A weight average molecular weight of the second binder is 600,000 or less.
一种用于充电电池的隔膜包括多孔基材及其至少一个表面上的粘合剂层。粘合剂层包括第一粘合剂、第二粘合剂和填料。第一粘合剂包括源自偏氟乙烯的结构单元和源自六氟丙烯的结构单元。衍生自六氟丙烯的结构单元的含量约为第一粘合剂总重量的 10%或更少。第一粘合剂的重量平均分子量在约 800,000 到约 1,500,000 之间。第二粘合剂包括一个源自偏氟乙烯的结构单元和一个源自六氟丙烯的结构单元。衍生自六氟丙烯的结构单元的含量为第二粘合剂总重量的 10%或更少。第二粘合剂的重量平均分子量为 600,000 或更低。