Benign solvents for recycling and re-use of a multi-layer battery pouch

Marshall, J.E., Middleton, B., Gastol, D. , Sommerville, R., McElroy, Con, Kendrick, E. and Goodship, V. (2022) Benign solvents for recycling and re-use of a multi-layer battery pouch. Materials Advances, 3 (12). pp. 4973-4981. ISSN 2633-5409

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Benign solvents for recycling and re-use of a multi-layer battery pouch
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This article describes a process for the repair and re-use of an aluminium-containing pouch used as an outer casing for a Lithium-ion battery cell. As Lithium-ion batteries become more widespread, particularly with their increasing use in the automotive industry and in consumer electronics, recycling them is becoming an important challenge. Current recycling approaches for Li-ion batteries focus on reclamation of the high-value metals found in the electrodes. However, in order to minimise the environmental impact of the battery it would be optimal to be able to reclaim and re-use other components. Since many battery cells consist of an electrode stack held inside an outer pouch, we herein describe the structure of such a pouch and suggest methods for selectively stripping and repairing the inner layer, allowing the material to be re-used. We investigated the use of three different solvents (xylene, limonene, and 2,2,5,5-tetramethyloxolane) for the selective stripping of the polypropylene (PP) layer on the inner side of a pouch material. Each solvent was tested on both ‘pristine’ pouch material (as obtained from the manufacturer) and pouch material that had previously been part of a battery. For ‘used’ pouch material, the overall thickness of the film decreased from 150–160 μm to 70–80 μm in under 1 h for all three solvents (corresponding to the removal of the PP layer), whereas for the ‘pristine’ pouch higher temperatures and longer times were required; this result is suggestive of some polymer degradation during the life of the pouch. Following the removal of the PP layer, virgin PP was subsequently added to renew the multi-layer structure.

Additional Information:cited By 0
Keywords:batteries, Recycling, polymers, solvents, sustainable
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
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ID Code:54730
Deposited On:22 May 2023 11:10

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