US 12,230,760 B2
Microporous membranes, battery separators, batteries, and devices having the same
Changqing Adams, Fort Mill, SC (US); Geoffrey Allen Tice, Rock Hill, SC (US); and Gary Michael Shirah, Edgemoor, SC (US)
Assigned to Celgard, LLC, Charlotte, NC (US)
Appl. No. 16/760,969
Filed by Celgard, LLC, Charlotte, NC (US)
PCT Filed Nov. 1, 2018, PCT No. PCT/US2018/058664
§ 371(c)(1), (2) Date May 1, 2020,
PCT Pub. No. WO2019/089897, PCT Pub. Date May 9, 2019.
Claims priority of provisional application 62/581,317, filed on Nov. 3, 2017.
Prior Publication US 2020/0303704 A1, Sep. 24, 2020
Int. Cl. H01M 10/0569 (2010.01); H01M 50/417 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); H01M 50/494 (2021.01)
CPC H01M 10/0569 (2013.01) [H01M 50/417 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); H01M 50/494 (2021.01); H01M 2300/0028 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A trilayer microporous battery separator which comprises a microporous film, the microporous film having a polypropylene/polyethylene/polypropylene layer structure having a layer thickness ratio of 31%/38%/31%; having a thickness from 12 to 17 microns, having an average lamellae thickness of 132 nm, and a maximum lamellae thickness between 153 and 195 nm, a swelling in DEC of 0.7% or less, unrestrained MD shrinkage, when the microporous film is baked unrestrained at 90° C. for 1 hour, of more than 5%, an unrestrained MD shrinkage, when the microporous film is baked unrestrained at 105° C. for 1 hour, of 9% or more, and having at least one property selected from the group consisting of:
MD restrained growth of less than or equal to 0.2%;
rebound of 5% or greater;
a max compression greater than or equal to 18%;
the microporous film exhibits a round-shaped opening having a length equal to a height of the opening when subjected to a puncture test;
a normalized puncture strength above 350 gf/16 micron; and
wherein the lamellae are structures extending between pores in the microporous film.