Recycling of galvanic cells

H - Electricity – 01 – M

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H01M 10/54 (2006.01) C22B 7/00 (2006.01) C22B 26/12 (2006.01) H01M 6/52 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2313173

Lithium ion cells in which the cathode contains a particulate insertion material and a binder are cut open in a dry, inert atmosphere (10). The cell components are treated with a first organic solvent (12) to dissolve the electrolyte, so that this can be reused. They are then treated with a second organic solvent (16) to dissolve the binder, and the particulate material separated (18) from the solution of binder. The insertion material is then reduced (22) so that it does not contain intercalated lithium. The reduction process may be performed electrolytically.

L'invention concerne des piles ioniques au lithium dans lesquelles la cathode comprend un matériau d'insertion particulaire et un liant. On coupe les piles afin de les ouvrir dans un environnement sec et inerte (10). Les composants des piles sont traités avec un premier solvant organique (12) pour dissoudre l'électrolyte de manière à pouvoir être réutilisé. Les piles sont ensuite traitées avec un second solvant organique (16) pour dissoudre le liant et le matériau particulaire séparé (18) de la solution de liant. Le matériau d'insertion particulaire est ensuite réduit (22) de manière à ne pas contenir de lithium intercalaire. Le procédé de réduction peut être effectué par électrolyse.

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