Method for preparing nickel cobalt lithium manganate lithium-ion battery positive material from waste lithium batteries

Abstract

The invention relates to the field of energy regeneration of lithium batteries, and provides a method for preparing a nickel cobalt lithium manganate lithium-ion battery positive material from waste lithium batteries. The method comprises the following steps: recycling the waste lithium ion batteries, dissolving into acid liquor to obtain a mixed metal solution, enabling calcium, magnesium, copper, zinc, lead, aluminum and other impurities in the mixed solution to enter an acid extractant organic phase, performing multistage refluxing on the organic phase loaded with the impurities, performing reverse extraction on the organic phase by using acid so as to regenerate the organic phase for reuse, and removing calcium, magnesium, copper, zinc, lead, aluminum and other impurities to obtain an impurity-free mixed solution; and conveying the prepared mixed metal solution and an additive solution into a freezing crystallization kettle to obtain nickel cobalt manganese lithium salt powder. By the method, nickel, cobalt, manganese and lithium elements are recycled from the waste batteries and waste positive materials, and after impurity removal, the nickel cobalt lithium manganate positive material is produced in a recycling manner so as to synthesize a regenerated product with the same performance as an original product in a directional recycling manner, so that resource reutilization of main metals in all the lithium-ion batteries is achieved.

Description

technical field [0001] The invention relates to the field of energy recovery and utilization of waste lithium batteries, in particular to a method for preparing nickel-cobalt lithium manganate lithium ion battery cathode materials from waste lithium batteries. Background technique [0002] With the continuous development of the communication industry, electric vehicle industry and digital product industry, people's demand for batteries is increasing, and power and energy storage batteries have emerged as the times require. The country is introducing many policies to encourage the research and application of large batteries. It can be predicted that a large number of batteries will be produced in the near future. However, the battery has a certain period of service life. When the service life of the battery expires, it will enter the scrapping stage. With the current number of power batteries, it can be expected that a large number of waste batteries will be generated. Becau...

AI Technical Summary

Problems solved by technology

In order to overcome the shortcomings of uneven distribution of multi-elements, low product capacity, and low energy density in the current method of preparing positive electrode materials, the freeze crystallization method is improved on the basis of the precipitation method, and the crystallization method is directly crystallized under freezing conditions by adding additives. Nickel-cobalt-manganese-lithium salt is produced, and different freeze crystallization conditions and additives are controlled, which can effectively control the particle size and element distribution of the material, and solve the problems in the prior art of controlling the particle size distribution of battery materials, uneven element distribution, and unstable product performance.

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