Recovery and Reuse of Composite Cathode Binder in Lithium Ion Batteries. Issue 5 (4th May 2021)

• Record Type: Journal Article
• Authors: Sarkar, Amrita; May, Richard; Ramesh, Sapna; Chang, Wesley; Marbella, Lauren E.
• Is Part Of: ChemistryOpen. Volume 10:Issue 5(2021)
• Page Start: 545
• Page End: 552
• Publication Date: 2021-05-04
• Subjects: direct cathode recycling -- HF elimination -- lithium-ion batteries -- PVDF recycling -- PVDF solubility; Chemistry -- Periodicals; 540; 540.5
• DOI: 10.1002/open.202100060
• Languages: English
• ISSNs: 2191-1363

Abstract

Abstract: Here, we investigate the recovery and reuse of polyvinylidene fluoride (PVDF) binders from both homemade and commercial cathode films in Li ion batteries. We find that PVDF solubility depends on whether the polymer is an isolated powder or cast into a composite film. A mixture of tetrahydrofuran:N‐methyl‐2‐pyrrolidone (THF : NMP, 50 : 50 v/v) at 90 °C delaminates composite cathodes from Al current collectors and yields pure PVDF as characterized by 1 H nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), wide‐angle X‐ray scattering (WAXS), and scanning electron microscopy (SEM). PVDF recovered from Li ion cells post‐cycling exhibits similar performance to pristine PVDF. These data suggest that PVDF can be extracted and reused during Li ion battery recycling while simultaneously eliminating the formation of HF etchants, providing an incentive for use in direct cathode recycling. Abstract : The structure, purity, and reuse of polyvinylidene fluoride binder recovered from spent lithium‐ion battery cathodes have been investigated.