Summary:

This invention provides a lithium recovery method based on alkaline substance assistance. The method comprises the following steps: Leaching the negative electrode from lithium-ion batteries to obtain the solid-liquid mixture with the assistance of lithium extraction reagent. Lithium extraction reagent is an organic solvent dissolved with aromatic compounds and alkaline substances. The solid electrolyte film on the surface of graphite is destroyed by alkaline substances during operation to accelerate the leaching rate. The alkaline substances can destroy the dense solid electrolyte film on the graphite surface to promote the electron exchange at the interface, affording an effective reaction between lithium ion and aromatics compounds, This method greatly shortens the lithium extraction time and improves the lithium extraction efficiency.

Link：http://epub.cnipa.gov.cn/patent/CN117821757A