Method for preparing ternary positive electrode material precursor by virtue of waste batteries

Abstract

The invention discloses a method for preparing a ternary positive electrode material precursor by virtue of waste batteries. The method comprises the steps of detaching waste batteries, roasting the detached waste batteries and carrying out sulfuric acid dissolving to obtain a waste battery positive electrode material, then separating and removing metal impurities in the waste battery positive electrode material by virtue of an extraction method to obtain a sulfate solution, supplementing manganese or aluminum to prepare a mixed solution for preparing the ternary positive electrode material precursor, then sequentially adding ammonia water and a sodium hydroxide solution, reacting to generate ternary positive electrode material precursor precipitates, and finally washing and drying to obtain the ternary positive electrode material precursor. According to the method, the cyclic utilization of resources of nickel and cobalt in waste batteries is realized, and the environmental pollution caused by heavy metals is avoided; furthermore, a nickel-cobalt-aluminum precursor and a nickel-cobalt-manganese precursor are produced from the recycled waste batteries, so that the requirements on primary mineral resources are lowered, and the purchase costs of nickel and cobalt are lowered; the method adopts a simple technological process and is applicable to industrial large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a precursor of a ternary positive electrode material, in particular to a method for preparing a precursor of a ternary positive electrode material by using waste batteries. Background technique [0002] The recycling and resource utilization of waste batteries is not only the need for environmental protection and the development of the international battery market, but also an inevitable choice to alleviate the shortage of strategic metal resources in my country and promote the sustainable development of my country's battery industry. Waste secondary batteries contain varying amounts of heavy metals or rare precious metal elements (for example, ordinary lithium-ion batteries contain 20% cobalt, 10% copper, 4.7% aluminum, 2.5% iron, and 0.1% lithium, etc.; nickel-hydrogen batteries contain 30% nickel , 4% cobalt and about 10% light rare earth metals), while China’s cobalt, copper, and nickel resources are ...

AI Technical Summary

Problems solved by technology

However, metallurgical chemical methods are complex in process, high in extraction costs, and very uneconomical. Therefore, there is still a lack of effective methods to obtain ternary cathode material precursors by recycling waste batteries.