US 12,132,176 B2
Methods for recovering and reusing polymeric binders from composite cathode films
Lauren Elizabeth Marbella, New York, NY (US); Amrita Sarkar, New York, NY (US); and Richard May, New York, NY (US)
Assigned to The Trustees of Columbia University in the City of New York, New York, NY (US)
Filed by The Trustees of Columbia University in the City of New York, New York, NY (US)
Filed on Oct. 13, 2021, as Appl. No. 17/500,077.
Claims priority of provisional application 63/091,124, filed on Oct. 13, 2020.
Prior Publication US 2022/0115716 A1, Apr. 14, 2022
Int. Cl. H01M 10/42 (2006.01); B29B 17/02 (2006.01); C08J 11/28 (2006.01); H01M 4/62 (2006.01)
CPC H01M 10/4242 (2013.01) [B29B 17/02 (2013.01); C08J 11/28 (2013.01); H01M 4/623 (2013.01); B29B 2017/0244 (2013.01); B29B 2017/0289 (2013.01); B29B 2017/0293 (2013.01); C08J 2327/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of recovering materials from a cathode film, comprising:
contacting a cathode film isolated from a battery with a solvent including N,N-dimethylformamide (DMF), N-methyl-2-pyrrolidine (NMP), a tetrahydrofuran (THF):NMP mixture, or a THF:DMF mixture, the cathode film including a binder including poly(vinylidene fluoride) (PVDF);
dissolving the PVDF from the cathode film with the solvent to produce a product solution; and
isolating a PVDF product solution from the product solution via alumina column separation.