Comprehensive recycling method for positive and negative electrodes of scrapped lithium batteries

Abstract

The invention discloses a comprehensive recycling method for positive and negative electrodes of scrapped lithium batteries. The method concretely comprises the following steps: separating aluminum and copper from the batteries through pretreatment, drying the remaining material, adding a phase reconstructing agent, uniformly mixing the remaining material with the phase reconstructing agent, performing low-temperature catalytic calcinations, cooling and crushing the calcined material, performing an impregnating reaction in a neutral salt system, carrying out solid-liquid separation, allowing soluble lithium to enter a liquid phase, removing impurities, carrying out concentrative crystallization, drying and crushing obtained crystals to obtain battery grade lithium carbonate, introducing carbon dioxide to the above obtained crystallization mother liquid, and performing drying and crushing to obtain the battery grade lithium carbonate; and allowing insoluble nickel, cobalt, manganese andcarbon to enter a solid phase, washing the obtained solid phase, adding an ore dressing agent in a carbonate radical-containing environment, carrying out flotation to separate carbon from nickel-cobalt-manganese, performing washing, activation, drying and sorting on the separated carbon to obtain a negative electrode material, and directly washing the separated nickel-cobalt-manganese with pure water to directly become a nickel-cobalt-manganese polynary precursor material raw material. The method has the advantages of short process, moderate energy consumption, high comprehensive yield of valuable elements of the positive and negative electrodes, good product quality, environmental friendliness, low cost, and suitableness for industrialization.

Description

technical field [0001] The invention relates to the field of battery reuse, in particular to a comprehensive recycling method for positive and negative electrodes of scrap lithium batteries. Background technique [0002] Batteries are a common item in people's daily life and work. Battery (Battery) refers to a cup, tank or other container or part of a composite container that contains an electrolyte solution and a metal electrode to generate current, and is a device that converts chemical energy into electrical energy. It has positive pole and negative pole. As technology advances, batteries generally refer to small devices that can generate electricity. Such as solar cells. The performance parameters of the battery mainly include electromotive force, capacity, specific energy and resistance. Using the battery as the energy source can obtain stable voltage, stable current, stable power supply for a long time, and a current that is little affected by the outside world, an...

AI Technical Summary

Problems solved by technology

[0004] In the recycling method of scrap lithium batteries, the traditional pyrometallurgy adopts high-temperature thermal decomposition in open hearth furnace or reduction furnace, which has the advantages of short process, but high energy consumption, difficulty in lithium recovery, high cost of flue gas treatment, unfriendly environment, and difficult anode. Recycling is gradually facing elimination; traditional wet smelting adopts high-acid leaching-extraction and impurity removal separation method, which has the advantages of strong adaptability, good product quality, and low energy consumption, but it has long process, serious equipment corrosion, and large amount of wastewater treatment , high cost of environmental protection treatment, low lithium recovery rate