US 11,909,006 B2
Thin battery separators and methods
Paul M. Halmo, Denver, NC (US); Xiaomin Zhang, Charlotte, NC (US); Paul D. Vido, Rock Hill, SC (US); Zhengming Zhang, Rock Hill, SC (US); Lie Shi, Matthews, NC (US); Daniel R. Alexander, Matthews, NC (US); and Jill V. Watson, Lake Wylie, SC (US)
Assigned to Celgard, LLC, Charlotte, NC (US)
Filed by Celgard, LLC, Charlotte, NC (US)
Filed on Feb. 24, 2023, as Appl. No. 18/113,640.
Application 18/113,640 is a division of application No. 17/468,261, filed on Sep. 7, 2021, granted, now 11,594,765.
Application 17/468,261 is a division of application No. 16/504,808, filed on Jul. 8, 2019, granted, now 11,114,702, issued on Sep. 7, 2021.
Application 16/504,808 is a division of application No. 15/492,062, filed on Apr. 20, 2017, granted, now 10,347,951, issued on Jul. 9, 2019.
Application 15/492,062 is a division of application No. 14/030,158, filed on Sep. 18, 2013, granted, now 9,666,847, issued on May 30, 2017.
Claims priority of provisional application 61/703,320, filed on Sep. 20, 2012.
Prior Publication US 2023/0207892 A1, Jun. 29, 2023
Int. Cl. H01M 10/42 (2006.01); H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/426 (2021.01); H01M 50/491 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01); H01M 50/417 (2021.01); H01M 50/409 (2021.01); H01M 50/449 (2021.01); H01M 50/411 (2021.01)
CPC H01M 10/4235 (2013.01) [H01M 10/0525 (2013.01); H01M 50/403 (2021.01); H01M 50/409 (2021.01); H01M 50/411 (2021.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 50/449 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01); H01M 50/491 (2021.01)] 21 Claims
OG exemplary drawing
 
1. A multilayer battery separator for a lithium secondary battery that comprises a microporous membrane comprising:
at least three coextruded dry-stretch process polypropylene (PP) layers that each has a thickness of less than or equal to 4 microns; and wherein the microporous membrane has a thickness in the range of 2 to 12 microns and has a ceramic coating or a polymer coating on at least one side thereof; and
wherein one PP layer of the at least three coextruded dry-stretch process PP layers is of a different PP material.