A method for recycling spent lithium metal polymer...

H - Electricity – 01 – M

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H01M 10/54 (2006.01)

Patent

CA 2391865

The method relates to a pyrometallurgical and hydrometallurgical process for the recovery and recycling of lithium and vanadium compounds from a material comprising spent rechargeable lithium batteries, particularly lithium metal gel and solid polymer electrolyte rechargeable batteries. The method involves providing a mass of the material, hardening it by cooling at a temperature below room temperature, comminuting the mass of cooled and hardened material, digesting with an acid its ashes obtained by incineration, or its solidified salts obtained by molten salt oxidation, or the comminuted mass itself, to give a mother liquor, extracting vanadium compounds from the mother liquor, separating heavy metals and aluminium therefrom, and precipitating lithium carbonate from the remaining solution.

L'invention concerne un procédé pyrométallurgique et hydrométallurgique de récupération et de recyclage de composés au lithium et au vanadium à partir d'un matériau comprenant des piles au lithium rechargeables, en particulier du type à gel au lithium et électrolyte polymère solide. On fournit une masse de matériau considéré qui subit les opérations suivantes: durcissement par refroidissement à une température inférieure à la température ambiante, comminution de la masse ainsi traitée, digestion avec un acide des cendres de cette masse résultant d'une incinération, ou des sels solidifiés résultant d'une oxydation en bain de sels fondus, ou bien comminution de la masse proprement dite. Le procédé donne une liqueur mère qui permet l'extraction des composés au vanadium, la séparation des métaux lourds et de l'aluminium, et la précipitation de carbonate de lithium à partir de la solution restante.

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