Method for preparation of nickel-cobalt-manganese ternary material with aluminum oxide coating layer by taking retired lithium ion battery as raw material

Abstract

The invention discloses a method for preparation of a nickel-cobalt-manganese ternary material with an aluminum oxide coating layer by taking a retired lithium ion battery as a raw material. The method comprises the steps of: disassembling a retired lithium ion battery to obtain a cathode material containing nickel, cobalt and manganese elements; mixing the cathode material and an alkali solutionfor alkaline leaching and filtering to obtain an aluminum-containing alkaline leaching solution and a dealuminized cathode material; taking the dealuminized cathode material as a raw material to prepare and obtain a nickel-cobalt-manganese ternary material; mixing the nickel-cobalt-manganese ternary material and the aluminum-containing alkaline leaching solution, and adding an acid solution into the mixed solution for stirring to obtain an aluminum hydroxide and nickel-cobalt-manganese ternary material mixed suspension; and putting the aluminum hydroxide and nickel-cobalt-manganese ternary material mixed suspension in an aerobic environment for calcination to obtain a nickel-cobalt-manganese ternary material with an aluminum oxide coating layer. The method provided by the invention achieves cyclic utilization of the generated aluminum-containing alkaline leaching solution in the process of preparing the nickel-cobalt-manganese ternary material by taking the retired lithium ion batteryas a raw material and achieves the improvement of the structure stability and the cycle performance of the nickel-cobalt-manganese ternary material.

Description

technical field [0001] The invention relates to the technical field of nickel-cobalt-manganese ternary materials, in particular to a method for preparing a nickel-cobalt-manganese ternary material with an alumina coating layer by using decommissioned lithium-ion batteries as raw materials. Background technique [0002] Existing decommissioned lithium-ion battery recycling technologies can be divided into fire method and wet method; among them, fire method recovery consumes a lot of energy and is harmful to the environment; wet method recovery generally includes pretreatment, leaching of valuable metal elements, and separation of metal elements Extraction and other processes. [0003] At present, there are already some methods for recycling decommissioned lithium-ion batteries to prepare nickel-cobalt-manganese ternary materials. Among them, there is an existing method for preparing lithium nickel cobalt oxide from waste lithium-ion batteries. After processes such as binder...

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Problems solved by technology

[0004] Although the above-mentioned existing methods can realize the recycling of nickel-cobalt-manganese elements in decommissioned lithium-ion batteries, they do not involve the treatment of the aluminum-containing alkali immersion solution produced in the step of aluminum removal treatment, if the aluminum-containing alkali immersion solution therein Direct discharge will cause serious secondary pollution and waste of aluminum resources

In addition, when the nickel-cobalt-manganese ternary material prepared by the above existing method is used to prepare batteries, its surface is prone to chemical reactions with the electrolyte, which cannot meet the requirements of commercial applications.

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