Process for selectively extracting valuable metals in waste power lithium battery and repreparing ternary positive electrode material

Abstract

The invention discloses a process for selectively extracting valuable metals in a waste power lithium battery and repreparing a ternary positive electrode material. The method comprises the followingsteps: (1) carrying out complete discharge, disassembly, ultrasonic stripping, calcination and grinding treatment on a recycled waste lithium battery to obtain a required LiNi1 / 3Mn1 / 3CoO2 positive electrode material; (2) leaching the LiNi1 / 3Mn1 / 3CoO2 positive electrode material through a wet metallurgy method by using mild acid and reducing agent, wherein the ratio of the positive electrode material to the added acid is controlled to be 20-60 mL / g, so as to obtain a leaching solution rich in lithium and a precipitate containing nickel-cobalt-manganese; (3) leaching the precipitate again by using a trace amount of acid and reducing agent, wherein the ratio of the precipitate to the added acid is controlled to be 20-60mL / g to obtain a metal-rich salt solution; and (4) carrying out coprecipitation on the metal salt solution to obtain a ternary precursor, adding excessive 3-10% of a lithium source according to the amount of substance of the precursor, and calcining the material at a selected temperature to obtain the ternary positive electrode material with good electrochemical performance. According to the method, metal resource utilization can be achieved, the problem of harmful garbage pollution is solved, and the cost is low.

Description

technical field

[0001] The invention relates to the technical field of effective recovery of valuable metals from waste batteries, in particular to a process for selectively extracting valuable metals from waste power lithium batteries and re-preparing ternary positive electrode materials. Background technique

[0002] With the rapid development of science and technology, lithium-ion batteries are widely used in people's lives because of their high energy and relatively long life. Quantity produced. The metals contained in lithium-ion batteries are all harmful metals, which have non-negligible pollution to the environment and ecology. Currently, effective recycling of these metals such as manganese, nickel, cobalt, and lithium can not only effectively alleviate environmental pollution, but also can be recycled. To solve the problem of resource shortage, the garbage classification currently carried out in China has more effectively promoted the recycling and reuse of used ba...

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