H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 10/54 (2006.01) C01D 15/08 (2006.01) C01G 31/00 (2006.01) H01M 6/52 (2006.01) C22B 26/12 (2006.01)
Patent
CA 2319285
The invention relates to a method for the neutralization and the recycling of spent rechargeable lithium batteries, particularly lithium metal polymer batteries, comprising at least one negative electrode active material, a separator, an electrolyte, one positive electrode active material, a current collector and a cell casing. After mechanical dismantling of the casing, the method involves three distinct possible processes, i.e., digestion into a solvent, incineration, or molten salt oxidation. The three processes include the steps of mechanically dismantling the batteries to remove the metal casing and the electric hardware as scrap, lowering the temperature of the free electrochemical cells (ECs) below ambient temperature., and shredding the ECs into pieces while in cold state before further processing. The processes also include the further steps of digestion in a solvent, molten salt oxidation or incineration, during which the highly reactive and hazardous spent batteries are first of all reduced to inert materials exhibiting a low chemical reactivity. Afterwards, the processes involve collecting the solid, liquid and gaseous discharges from the reactor, dissolving the solid and liquid discharges with an appropriate solvent and absorbing the gaseous effluents with an alkaline solution, mixing the resultant wash streams, separating precipitates formed from the mixed stream and neutralizing the remaining solution. Finally, the last step consists in recovering efficiently, safely, and in a relatively economical manner the valuable by-products such as vanadium and lithium compounds for reuse in the manufacture of electrochemical cells.
Cardarelli Francois
Dube Jonathan
Avestor
Hydro-Quebec
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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