公开(公告)号：EP4391195A1

公开(公告)日：2024-06-26

申请号：EP23210466.1

申请日：2023-11-16

申请人： SK On Co., Ltd.

发明人： JO, Yun Kyung ,  KIM, Jeong Han ,  KIM, Whee Sung ,  YEON, Dae Yong

IPC分类号： H01M50/489 ,  H01M50/491 ,  H01M50/414 ,  H01M50/417 ,  H01M50/446 ,  H01M50/449 ,  H01M50/457 ,  H01M10/0525

CPC分类号： H01M50/417 ,  H01M50/414 ,  H01M50/446 ,  H01M50/449 ,  H01M50/457 ,  H01M50/491 ,  H01M50/489 ,  H01M10/0525

摘要： A separator for a secondary battery includes a porous polymer material; and a coating layer including an inorganic material and a binder on one or both surfaces of the porous polymer material, wherein a ratio of average pore size of the separator to a maximum pore size, measured by a bubble point method, is 0.5 to 0.99, and surface roughness Rz is 2.5 or less, and the separator may have excellent withstand voltage characteristics as a thin film and may exhibit suitable evaluation characteristics in a Hi-pot test performed during a battery assembly process.