US 12,469,928 B2
Safe lithium-ion battery (LIB) separator, fabrication method thereof, and LIB
Shiwei Zang, Chongqing (CN); and Wenqing Liu, Chongqing (CN)
Assigned to CHONGQING JIMAT NEW MATERIAL TECHNOLOGY CO., LTD., Chongqing (CN)
Appl. No. 17/766,223
Filed by CHONGQING JIMAT NEW MATERIAL TECHNOLOGY CO., LTD., Chongqing (CN)
PCT Filed Jun. 10, 2021, PCT No. PCT/CN2021/099441
§ 371(c)(1), (2) Date Apr. 2, 2022,
PCT Pub. No. WO2022/121265, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 202011463207.4 (CN), filed on Dec. 11, 2020.
Prior Publication US 2023/0198093 A1, Jun. 22, 2023
Int. Cl. H01M 50/40 (2021.01); H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/446 (2021.01); H01M 50/449 (2021.01)
CPC H01M 50/403 (2021.01) [H01M 10/0525 (2013.01); H01M 50/446 (2021.01); H01M 50/449 (2021.01)] 19 Claims
OG exemplary drawing
 
1. A fabrication method of a safe lithium-ion battery (LIB) separator, comprising the following steps:
S1: a preparation of a water-based slurry: mixing a ceramic material, magnesium oxide, conductive carbon black (CB), and a water-based adhesive, and thoroughly stirring to obtain the water-based slurry;
S2: a fabrication of a first film: adding 50 to 60 parts of trans-1,4-polyisoprene, 20 to 30 parts of cis-polybutadiene rubber (cis-BR), 5 to 10 parts of conductive CB, and 5 to 10 parts of water-soluble salt to a compounding granulator for compounding to obtain a memory material with a particle size of 10 nm to 20 nm;
adding the memory material to a mixed solution of aluminum nitride and ethanol to obtain a resulting mixture, stirring, and subjecting the resulting mixture of the memory material and the mixed solution to a suction filtration to obtain a filter cake; and drying the filter cake to obtain a dried filter cake, and subjecting the dried filter cake to a calcination under a protection of an inert gas to obtain an aluminum nitride-coated solid material;
mixing a high-polymer particle with the aluminum nitride-coated solid material to obtain a resulting mixed material, adding the resulting mixed material to a film-blowing machine, blowing the resulting mixed material of the high-polymer particle and the aluminum nitride-coated solid material into a first previous film by a film-blowing method, and watering and drying the first previous film to obtain the first film;
S3: a fabrication of a second film: melting a mixture of a halogen-containing compound and a water-soluble salt, conducting a blow-molding on the mixture to obtain a second previous film, and watering and drying the second previous film to obtain the second film; and
S4: a fabrication of the LIB separator: coating the water-based slurry on the first film to form a first water-based slurry layer on a surface of the first film, to obtain a first composite film; and coating the water-based slurry on the second film to form a second water-based slurry layer on a surface of the second film, to obtain a second composite film; and
drying the first composite film and the second composite film, and compounding the first water-based slurry layer on the first composite film with the second water-based slurry layer on the second composite film to obtain the LIB separator.