Method for recovering highly-magnetic materials during preparation of positive electrode precursor materials and preparation method of nickel-cobalt-manganese precursor material

Abstract

The invention provides a method for recovering highly-magnetic materials during preparation of positive electrode precursor materials. The method comprises the following steps of uniformly mixing thehighly-magnetic materials with pure water to obtain a size, feeding the size into a stirring tank with a permanent magnet iron remover for stirring, extracting an iron bar to clean and separate magnetic substance, and then filtering and drying the magnet-eliminated size to obtain positive electrode precursor products. The method for recovering the highly-magnetic materials during preparation of the positive electrode precursor materials can increase the recovering rate of products, greatly reduce the production costs, achieve thorough cleaning of the magnetic substance and avoid endless loop due to the magnetic substance polluting and entering a system. The invention also provides a preparation method of a nickel-cobalt-manganese precursor material. Compared with existing wet nickel-cobalt-manganese precursor synthesizing processes, the preparation method of the nickel-cobalt-manganese precursor material can greatly reduce the production cost and the product quality risk under the premise of ensuring the product quality, thereby creating considerable profits for enterprises.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a method for recovering high-magnetic materials in the preparation of positive electrode precursor materials and a method for preparing nickel-cobalt-manganese precursor materials. Background technique [0002] As a new type of green secondary battery, lithium-ion battery has the advantages of large specific capacity, small self-discharge, light weight, and no memory effect. At present, it has been widely used in various mobile electronic products (such as mobile phones, cameras, notebook computers, etc.), artificial satellites, aerospace and other fields, and has also made breakthroughs in the field of electric vehicles. In order to meet the growing needs of these application fields, nickel-cobalt-manganese precursor materials have also developed rapidly, and the output has increased day by day, and the quality requirements for precursor materia...

AI Technical Summary

Problems solved by technology

Since the detection of the magnetic substance of the product is a random sampling, if the high magnetic substance is not detected in time, when the positive electrode material is sintered, the magnetic substance in the precursor may be wrapped in during the sintering process. , can not be removed, thus affecting the performance of the battery, resulting in increased self-discharge of the battery and reducing the service life of the battery

The risk of acid dissolution and recovery of high-magnetic materials is greater. After the high-magnetic materials are dissolved by acid to form a sulfate solution, the iron concentration of the solution is relatively high. Removing the iron concentration to a low level will lead to a corresponding increase in the loss of nickel, cobalt, and manganese in the solution, increasing production costs. On the other hand, the impurity removal process itself has pollution risks, and it is very difficult to completely remove iron; After the solution enters the precipitation reaction, it will inevitably cause some unremoved magnetic substances to be directly wrapped in the precursor product particles, and after the products wrapped with magnetic substances are demagnetized by the production line, the magnetism will be weakened due to being wrapped, so that it will not It is absorbed by the magnet and directly flows into the positive electrode material manufacturer, and finally enters the battery, which eventually leads to a sharp decline in battery performance, especially for power batteries, this loss is immeasurable

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