US 12,482,828 B2
Method for preparing a cathode of a secondary battery and a purified N-methyl pyrrolidone, and purifying a waste N-methyl pyrrolidone using an inhibitor
Jae Won Shim, Jeollanam-do (KR); Sung Won Shim, Jeollanam-do (KR); Byung Ki Son, Daejeon (KR); Hwan Choi, Jeollanam-do (KR); Youn Soo Shin, Jeollanam-do (KR); Tae Gi Choi, Jeollanam-do (KR); Hwa Yeong Choi, Jeollanam-do (KR); and Yeong Su Choo, Jeollanam-do (KR)
Assigned to JAEWON INDUSTRIAL CO., LTD, Jeollanam-Do (KR)
Filed by JAEWON INDUSTRIAL CO., LTD, Jeollanam-do (KR)
Filed on May 16, 2024, as Appl. No. 18/665,876.
Claims priority of application No. 10-2023-0063170 (KR), filed on May 16, 2023; and application No. 10-2024-0063534 (KR), filed on May 15, 2024.
Prior Publication US 2024/0387829 A1, Nov. 21, 2024
Int. Cl. H01M 4/62 (2006.01); B01D 3/34 (2006.01); C07D 207/267 (2006.01); H01M 4/04 (2006.01); H01M 4/139 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/628 (2013.01) [B01D 3/34 (2013.01); C07D 207/267 (2013.01); H01M 4/0404 (2013.01); H01M 4/139 (2013.01); H01M 2004/028 (2013.01)] 16 Claims
 
1. A method for preparing a cathode of a secondary battery, the method comprising:
coating a dispersion comprising a N-methyl pyrrolidinone (NMP), a first inhibitor and a cathode active material on a current collector,
wherein the first inhibitor prevents the NMP from being decomposed to produce formaldehyde during the coating process, and
more than 50 ppm of the first inhibitor based on the weight of the NMP is contained in the dispersion.