CPC H01M 10/0525 (2013.01) [H01M 50/403 (2021.01); H01M 50/417 (2021.01); H01M 50/44 (2021.01); H01M 50/454 (2021.01); H01M 50/457 (2021.01); H01M 50/489 (2021.01); H01M 50/494 (2021.01); H01M 4/5825 (2013.01)] | 13 Claims |
1. A microporous battery separator for a lithium battery, comprising:
a) a polyolefin layer which comprises at least one membrane of polypropylene; and
b) at least one non-woven layer on at least one side of the polyolefin layer, wherein the non-woven layer comprises polypropylene, and wherein the separator has a surfactant coating thereon and wherein the surfactant coating consists of a combination of lithium salts of a linear and branched alkylbenzene sulfonic acid depicted in the following chemical structures (1) and (2) in a combined weight add-on amount of from about 1.37% to about 10.0 wt. %:
where R is an alkyl functionality having the following formula CnH2n+1 with n >6 and Xm+is Li+or
where R1 and R2 are independently an alkyl functionality which can be CnH2n+1, with n>6 and Xm+is Li+.
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