CPC H01M 50/417 (2021.01) [C08J 9/26 (2013.01); C08J 9/365 (2013.01); H01M 10/0525 (2013.01); H01M 50/403 (2021.01); H01M 50/443 (2021.01); H01M 50/451 (2021.01); H01M 50/46 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); C08J 2201/0462 (2013.01); C08J 2323/06 (2013.01); C08J 2401/28 (2013.01)] | 14 Claims |
1. A separator for an electrochemical device comprising:
a porous substrate,
wherein the porous substrate has a porosity of 40% to 70%,
wherein the porous substrate has a mean pore size of 20 nm to 35 nm,
wherein the porous substrate comprises polyethylene having a weight average molecular weight in a range of 200,000 to 500,000, and
wherein the polyethylene has an entangle molecular weight of 2,500 g/mol or less, and
wherein the porous substrate has two peaks comprising a first peak at 130° C. to less than 145° C. and a second peak at 145° C. to 160′C upon an initial scanning in a differential scanning calorimetry (DSC) curve, and
wherein the second peak appears only upon the initial scanning in DSC analysis and is not identified upon a second or later scanning.
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