US 12,015,169 B2
Method of manufacturing separator
Bang Cha Rang Song, Pohang-si (KR); Lyong Jin Lee, Seoul (KR); and Yoo Chul Kim, Busan (KR)
Assigned to UNICOH SPECIALTY CHEMICALS CO., LTD., Pohang-si (KR)
Filed by UNICOH SPECIALTY CHEMICALS CO., LTD., Pohang-si (KR)
Filed on Jul. 8, 2021, as Appl. No. 17/370,160.
Claims priority of application No. 10-2021-0067215 (KR), filed on May 25, 2021.
Prior Publication US 2022/0384907 A1, Dec. 1, 2022
Int. Cl. H01M 50/406 (2021.01); H01M 50/431 (2021.01); H01M 50/443 (2021.01); H01M 50/497 (2021.01)
CPC H01M 50/406 (2021.01) [H01M 50/431 (2021.01); H01M 50/443 (2021.01); H01M 50/497 (2021.01)] 7 Claims
OG exemplary drawing
 
1. A method of manufacturing a separator comprising:
preparing expansion graphite;
pulverizing the expansion graphite;
mixing the expansion graphite and polymer; and
forming a separator by molding the mixture,
wherein after the step of pulverizing the expansion graphite but before the step of mixing the pulverized expansion graphite and polymer, a step of high temperature heat treatment of the pulverized expansion graphite is performed, and
wherein the S content of the heat treated pulverized expansion graphite is 0.84 wt % to 1.30 wt %.