A method for preparing a precursor of anode material for ternary lithium batteries by using waste lithium-ion batteries

Abstract

A method for preparing a ternary lithium battery material precursor from waste lithium-ion batteries. The main materials include positive electrode material waste powder and metal sulfide, and the positive electrode waste of ternary lithium batteries and nickel sulfide intermediates are used as raw materials to prepare lithium ion battery positive electrode materials. Add nickel sulfide intermediate waste to the waste, add an appropriate amount of sulfuric acid to react and leach under high pressure conditions, add a small amount of hydrogen peroxide as a reducing agent to continue leaching valuable elements of nickel, cobalt, and manganese, and remove impurities and proportion the leaching solution. Then, the lithium ion battery cathode material precursor is prepared by using the mixed metal ion solution, ammonia water and sodium hydroxide as raw materials. The invention has the advantages of high waste leaching rate, short process, simple process and low cost, not only can process lithium battery positive electrode material waste on a large scale, but also can process waste nickel sulfide intermediate products, and promotes lithium ion battery positive electrode material waste materials and waste nickel sulfide intermediate products. recycling.

Description

technical field [0001] The invention relates to a method for preparing a ternary lithium battery material precursor, in particular to a method for preparing a ternary lithium battery positive electrode material precursor by utilizing waste lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in various electronic equipment, electric vehicles, military, etc. because of their advantages such as high energy density, good cycle performance, easy portability, and high charge and discharge efficiency. Especially with the development of electric vehicles, power lithium-ion batteries The battery has ushered in unprecedented development. However, the problem of recycling waste lithium-ion battery materials has also followed. Especially in 2018, as the first-generation lithium battery scrap peak in my country, the market value of its recycling and reuse is even more immeasurable. [0003] Because the positive electrode waste of lithium-ion batter...

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Problems solved by technology

[0004] CN107475538A discloses a method for leaching valuable metals in waste lithium cobaltate by using citric acid and sodium thiosulfate. Citric acid is more expensive than common inorganic acids, and cobalt precipitation with ammonium oxalate is likely to cause pollution

[0005] CN106848474A discloses a method for reclaiming positive electrode material precursors and lithium carbonate from lithium ion battery positive electrode material waste, but the acid used in this method has volatility, easily causes acid loss, and is more corrosive to equipment

[0007] CN106450548A discloses a method for preparing a ternary positive electrode material from a waste lithium manganate positive electrode material. The raw material of the invention patent is waste lithium manganate, and the final preparation is a ternary lithium ion battery positive electrode material to prepare a ternary lithium ion battery positive electrode The raw material of the material is too single, and it is not possible to mix a variety of waste cathode materials

[0008] CN104659438B discloses a method for preparing a precursor of a ternary positive electrode material by using waste batteries. This invention patent requires steps such as dismantling and roasting waste batteries, and the process is relatively complicated, which increases production costs.

[0009] The disadvantages of the above-mentioned prior art are as follows: the leaching process introduces new impurities into the leachate, increasing the cost of impurity removal

Sodium thiosulfate is used as the reducing agent. The leaching process will not only introduce sodium ions, but also generate a large amount of sulfur dioxide, which is harmful to the working environment. At the same time, the precipitant also introduces ammonia pollution.

The use of volatile acids not only causes acid waste, but also volatile acids are corrosive to equipment, which increases the production requirements for equipment corrosion resistance, and the positive electrode material obtained by the chemical co-precipitation method is compared with the positive electrode material obtained by adding lithium source sintering to the precursor The performance is poor; and the secondary precipitated ternary precursor leads to the presence of impurities in the product

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