CPC H01M 10/0525 (2013.01) [H01M 50/414 (2021.01); H01M 50/417 (2021.01); H01M 50/42 (2021.01); H01M 50/423 (2021.01); H01M 50/426 (2021.01); H01M 50/429 (2021.01); H01M 50/446 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01); H01M 50/489 (2021.01); H01M 50/494 (2021.01)] | 19 Claims |
1. A battery separator, comprising:
a first porous substrate; and
a second porous substrate arranged on at least one surface of the first porous substrate; wherein,
an elongation at a break of the second porous substrate is greater than an elongation at a break of the first porous substrate in at least one of a machine direction or a transverse direction of the battery separator; and
the first porous substrate comprises one or more selected from the group consisting of polypropylene, polyethylene, polyethylene terephthalate, polyimide, and polyphthalaldehyde phenyl diamine.
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