Method for recycling nickel-cobalt-manganese waste ternary lithium battery positive electrode material

Abstract

The invention relates to a method for recycling a nickel-cobalt-manganese waste ternary lithium battery positive electrode material. The method comprises the following steps: discharging and disassembling a waste battery, and taking out a positive plate; cleaning the electrolyte on the positive plate and carrying out drying; adding the positive plate and aluminum nitrate into deionized water, carrying out stirring, taking out the aluminum foil, cleaning residual aluminum nitrate on the aluminum foil with deionized water, carrying out drying, and transferring the cleaning solution back to the mother solution; supplementing lithium into the mother solution, dropwise adding 50-70wt% of a soluble phosphate aqueous solution into the mother solution while stirring, and adjusting the pH with ammonia water until no precipitate is generated; and drying the mixed solution, and solution calcining in sections to obtain a regenerated positive electrode active material. By using the aluminum nitratesolution, the aluminum foil on the positive plate can be quickly and completely separated from the positive active substances, so that the stripping efficiency and the aluminum recovery rate are improved; the method is simple, convenient, quick, low in cost, safe and environment-friendly; the nickel-cobalt-manganese ternary lithium battery positive electrode material coated with aluminum phosphate is prepared by adopting wet coating-drying-segmented solid-phase sintering methods, so that the electrical property of the nickel-cobalt-manganese ternary lithium battery positive electrode materialis improved.

Description

technical field [0001] The invention belongs to the technical field of recycling and regeneration of waste lithium ion batteries, and in particular relates to a method for recycling positive electrode materials of nickel-cobalt-manganese waste ternary lithium batteries. Background technique [0002] Since Sony commercialized lithium-ion batteries (LIBs) in 1991, lithium-ion batteries have gradually replaced traditional nickel-metal hydride nickel-cadmium batteries with the advantages of high energy density, high voltage, good cycle performance, low self-discharge, and high charge-discharge efficiency. , as the most popular energy storage technology in applications ranging from portable electronic devices to electric vehicles, the market share of lithium-ion batteries has increased year by year, and the growth rate has been at the top of all rechargeable battery types. [0003] However, the service life of power batteries is generally not more than 10 years, and it will face ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for recycling nickel-cobalt-manganese waste ternary lithium battery positive electrode materials, to solve the problem that the existing recycling method uses a large amount of reagents, and the organic reagents are toxic and volatile; the process is complicated, and the separation effect is poor. Low recovery efficiency, low electrochemical performance of recycled products and other technical problems

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