CPC H01M 10/12 (2013.01) [H01M 10/06 (2013.01); H01M 50/417 (2021.01); H01M 50/446 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); H01M 50/449 (2021.01); H01M 2220/20 (2013.01); Y02E 60/10 (2013.01); Y02T 10/70 (2013.01)] | 9 Claims |
1. A lead acid battery comprising:
a polyolefin microporous membrane comprising polyethylene, preferably, ultrahigh molecular weight polyethylene, a particle-like filler, and a processing plasticizer; wherein the particle-like filler is present in an amount of 40% or more by weight; and wherein the polyethylene comprises polymer in a shish-kebab formation comprising a plurality of extended chain crystals (the shish formations) and a plurality of folded chain crystals (the kebab formations) and wherein the average repetition or periodicity of the kebab formations is from 1 nm to 150 nm, preferably less than 120 nm; and
having a shelf life estimated cold cranking amps loss as compared to an initial value of less than approximately 9%.
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