Recycling and regenerating method for graphite negative electrode of waste lithium ion battery

• Main Authors: ZHONG FAPING, TAN SHUIFA, JIANG SUBIN, HE CHIHUAN, LIU HONGBING, ZHU JIQUN
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a waste lithium ion battery graphite negative electrode recycling method, which comprises: pre-treating a waste lithium ion battery to obtain negative electrode material powder, and carrying out heat treatment on the negative electrode material powder to oxidize metal impurities in the negative electrode material powder to obtain the graphite negative electrode of the waste lithium ion battery. Then, a deep eutectic solvent formed by mixing choline chloride and glucose is adopted to conduct leaching treatment on the graphite negative electrode material subjected to heat treatment, after the leaching reaction, the deep eutectic solvent is used for washing solids obtained through solid-liquid separation, and then the solid material obtained through washing is directly placed in an inert atmosphere to be subjected to heat treatment carbonization; the regenerated graphite negative electrode material is obtained. The recovery and regeneration method has good economic and environmental benefi