US 12,424,653 B2
Separator and energy storage device
Jianjian Yi, Fujian (CN); Xinzhi Zhang, Fujian (CN); Zengbin Wei, Fujian (CN); and Xinghua Tao, Fujian (CN)
Assigned to NINGDE AMPEREX TECHNOLOGY LIMITED, Ningde (CN)
Filed by Ningde Amperex Technology Limited, Fujian (CN)
Filed on Feb. 18, 2021, as Appl. No. 17/178,843.
Application 17/178,843 is a continuation of application No. 16/013,887, filed on Jun. 20, 2018, granted, now 10,964,987.
Claims priority of application No. 201810321779.5 (CN), filed on Apr. 11, 2018.
Prior Publication US 2021/0184315 A1, Jun. 17, 2021
Int. Cl. H01M 50/449 (2021.01); H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/411 (2021.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 50/431 (2021.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/451 (2021.01); H01M 50/491 (2021.01)
CPC H01M 10/0525 (2013.01) [H01M 50/403 (2021.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 50/431 (2021.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01); H01M 50/446 (2021.01); H01M 50/451 (2021.01); H01M 50/491 (2021.01)] 16 Claims
OG exemplary drawing
 
1. A method for preparing a separator, wherein the method comprises steps of:
mixing inorganic particles with a binder to generate a mixture;
adding a first solvent into the mixture;
stirring the mixture with the first solvent to obtain a uniform coating solution;
coating the uniform coating solution onto a surface of a porous substrate to form a wet film; immersing the wet film into a coagulating solution for phase transformation; and
drying the wet film to obtain a porous layer on the surface of the porous substrate,
wherein a ratio of Dv90 of the inorganic particles to a thickness of the porous layer is in a range from 0.3 to 3.0.