US 12,456,762 B2
Shutdown separator
Peng Gao, Shanghai (CN); David L. Malotky, Midland, MI (US); Yunlong Guo, Shanghai (CN); Daniel L. Dermody, Midland, MI (US); Haiyang Yu, Shanghai (CN); and Wanfu Ma, Shanghai (CN)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/997,389
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Apr. 29, 2020, PCT No. PCT/CN2020/087777
§ 371(c)(1), (2) Date Oct. 28, 2022,
PCT Pub. No. WO2021/217496, PCT Pub. Date Nov. 4, 2021.
Prior Publication US 2023/0170536 A1, Jun. 1, 2023
Int. Cl. H01M 50/489 (2021.01); H01M 10/0525 (2010.01); H01M 10/42 (2006.01); H01M 50/417 (2021.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01)
CPC H01M 10/4235 (2013.01) [H01M 10/0525 (2013.01); H01M 50/417 (2021.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01); H01M 50/489 (2021.01)] 11 Claims
 
1. An electrochemical cell comprising:
a separator disposed between an optional anode and an optional cathode, the separator comprising
(A) a porous substrate comprising an olefin-based polymer having a melting point, Tm, greater than 130° C.;
(B) a porous coating layer on the substrate, the porous coating layer having a melting temperature from 80° C. to 110° C., the porous coating layer comprising a plurality of microparticles, and an optional binding agent, the microparticles having an average particle size from 0.3 microns to 1.5 microns, the microparticles comprising
(i) an ethylene-based polymer, the ethylene-based polymer having
(a) a density from 0.90 g/cc to less than 0.94 g/cc,
(b) a Tm from 90° C. to 120° C.,
(c) a melt index from 30 g/10 min to 600 g/10 min,
(ii) a dispersant comprising a C14-C40 aliphatic fatty acid; and
(iii) an optional acid functional wax.