Method for collaborative treatment of positive and negative active materials of waste lithium-ion batteries

Abstract

The invention discloses a method for collaborative treatment of positive and negative active materials of waste lithium-ion batteries, and belongs to the technical field of lithium-ion battery material recovery. Appropriate amount of concentrated sulfuric acids are added into a mixture of positive active materials and negative active materials obtained by crushing and separating the waste lithium-ion batteries for reaction and maturation to obtain solidified clinker, the obtained solidified clinker is leached with water or dilute acids, a leached solution containing cobalt, lithium, nickel, titanium and other useful metal elements is obtained from leached pulp through sedimentation and separation, high-quality graphite and residues are obtained from leached residues through centrifugal classification to achieve collaborative intensified treatment of the positive and negative active materials of the waste lithium-ion batteries, nickel, cobalt, manganese, lithium, graphite powder and other components can be recovered comprehensively, the recovery process of active materials in waste batteries is conducive to simplifying, the recovery rate of useful elements is high, and the purity ofrecovered graphite products is high. Main consumption agents of the method are sulfuric acids, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery material recovery, and relates to a method for synergistic treatment of positive and negative electrode materials of waste lithium ion batteries, in particular to a method for comprehensively recovering useful components such as lithium, cobalt, nickel, manganese, titanium, graphite, etc. method. Background technique [0002] Lithium batteries are generally composed of five parts: positive electrode material, negative electrode material, separator, electrolyte, and battery case. agent, copper foil composition. Lithium battery positive electrode active materials mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary materials such as nickel cobalt lithium manganese oxide, nickel cobalt lithium aluminate and other ternary materials; lithium battery negative electrode materials include graphite negative electrode materials and alloy negative ele...

AI Technical Summary

Problems solved by technology

[0008] Although there are many existing public methods for the comprehensive recovery of waste lithium-ion battery active materials, most of them treat positive electrode active materials and negative electrode active materials separately, resulting in a complicated recycling system for waste batteries, and due to the existing physical understanding It is difficult to completely separate the positive electrode active material from the negative electrode active material with separation technology, and they are mixed with each other, resulting in the production of a large amount of black slag in the process of positive electrode active material processing to form secondary pollution

However, in the processing of negative electrode active materials, the process is complicated, and the obtained graphite powder has low purity, poor quality and low value.

Since the negative electrode material also contains lithium, as well as current collectors or shell materials such as copper foil, aluminum foil, and stainless steel that remain after battery dissociation and incomplete separation, the negative electrode is treated separately, which is not conducive to the comprehensive recovery of lithium, etc.