A sustainable delamination method to completely separate spent cathode foils <i>via</i> biomass-derived γ-valerolactone

State-of-the-art manufacturing of positive electrodes in lithium ion batteries is carried out in N-methyl-2-pyrrolidone (NMP), an aprotic organic solvent which stands out for good wetting properties, a high boiling point allowing controlled evaporation during electrode drying, and dissolving properties, for the conventionally used polymeric binder polyvinylidene difluoride. The replacement of NMP with nonhazardous, alternative solvents was proven to be difficult in terms of binder solubility. Furthermore, the inevitable energy-demanding recovery of NMP due to safety concerns and environmental impact amounts for noteworthy costs during electrode manufacturing. Here, the use of dimethyl sulfoxide (DMSO), γ-valerolactone (GVL), and dihydrolevoglucosenone (Cyrene) as possible alternative solvents to replace NMP in the production of positive electrodes based on LiNi 0.6 Mn 0.2 Co 0.2 O 2 with a high active material mass loading is presented. Homogeneous electrodes were produced and thoroughly examined regarding adhesion strength, electronic conductivity, microstructure, possible solvent residues after drying, and electrochemical performance. It was shown that DMSO and GVL are hopeful candidates to replace NMP with DMSO being the superior alternative with similar performance results compared to electrodes produced with NMP. The comparison of different aprotic solvents reveals that a replacement of NMP with DMSO could be a step toward a greener, more sustainable electrode production.

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A sustainable delamination method to completely separate spent cathode foils via biomass-derived γ-valerolactone

Abstract: Complete and efficient delamination of cathode foil is the pivotal precondition for spent lithium-ion batteries (LIBs) recycling, determining the realizability of the subsequent operational processes. Current methods are based on...

Cited by 3 publications

References 68 publications

The latest research on the pre-treatment and recovery methods of spent lithium-ion battery cathode material

The latest research on the pre-treatment and recovery methods of spent lithium-ion battery cathode material

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