Method for separating aluminum foil from positive electrode active material in waste lithium ion battery

A positive electrode active material and lithium-ion battery technology, which is applied in the field of lithium-ion battery recycling, can solve the problems of potential safety hazards, large lye consumption, and increased acid consumption, so as to reduce energy consumption and recycling costs , the effect of low acid consumption

Active Publication Date: 2022-01-07
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the consumption of lye is large, and flammable hydrogen gas will be generated during the alkali dissolution process, which poses a safety hazard; and lye remains on the surface of the positive active material, and when the positive active material is dissolved with acid, the residual lye will neutralize the acid , resulting in increased acid consumption and increased costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) dismantling the waste lithium iron phosphate battery after discharge according to the existing conventional technology, collecting the positive electrode sheet therein, and pulverizing to obtain pulverized material;

[0031] 2) Mix the pulverized material and concentrated sulfuric acid according to the solid-to-liquid ratio of 1kg:0.8L, put it in a reaction kettle, and let it stand at 95°C for 2h. The obtained material is sieved, and the oversize and undersize are collected respectively. The above-mentioned sieve is aluminum foil, which is sent to recast or other processes for reuse;

[0032] 3) Put the undersize material in another reaction kettle, stir at 30°C for 3.5h, the obtained material is subjected to solid-liquid separation, and the filtrate is collected, which is the leaching solution containing the positive electrode active material (valuable metal extraction can be carried out according to the existing conventional process). separation and purification), ...

Embodiment 2

[0035] 1) dismantling the waste lithium iron phosphate battery after discharge according to the existing conventional technology, collecting the positive electrode sheet therein, and pulverizing to obtain pulverized material;

[0036] 2) Mix the pulverized material and concentrated sulfuric acid according to the solid-to-liquid ratio of 1kg: 1.7L, put it in a reaction kettle, and let it stand at 75°C for 3h, then sieve the obtained material, and use water (the amount of water is 30%) wash the oversize, collect oversize and undersize respectively, the oversize is aluminum foil, sent to recast or other processes for reuse;

[0037] 3) Put the undersize material in another reaction kettle and stir at 60°C for 1.5h. The obtained material is subjected to solid-liquid separation, and the filtrate is collected, which is the leaching solution containing the positive active material (valuable metal extraction can be carried out according to the existing conventional process). separatio...

Embodiment 3

[0040] 1) dismantling the waste nickel-cobalt lithium manganese oxide battery after discharging according to the existing conventional technology, collecting the positive electrode sheet therein, and pulverizing to obtain pulverized material;

[0041] 2) Mix the pulverized material and concentrated sulfuric acid according to the solid-to-liquid ratio of 1kg:4L, put it in a reaction kettle, and let it stand at 50°C for 4h. 5%) wash the oversize, collect oversize and undersize respectively, and the oversize is aluminum foil, which is sent to recasting or other processes for reuse;

[0042]3) Mix the undersize and 5wt.% ascorbic acid aqueous solution according to the solid-to-liquid ratio of 1kg:14L, place in another reaction kettle, stir at 40°C for 1h, separate the obtained material from solid-liquid, and collect the filtrate. That is, the leachate containing the positive electrode active material (the separation and purification of valuable metals can be carried out according ...

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PUM

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Abstract

The present invention discloses a method of separating aluminum foil from positive active substances in the waste lithium ion battery, including the following steps: 1) Collection of positive chips dismissed from waste lithium ion batteries, crushing; 2) crushing materials and concentrated sulfuric acidMix, react under heating or not heating conditions, screen the materials obtained, and sieve the material is aluminum foil; 3) mix the sieve and the glucose aquatic solution or the antibody water solution.Separation, collecting the filtrate, is an immersion liquid containing positive active substances; the concentration of the glucose aqueous solution or ascorbic acid aqueous solution is ≥5WT.Calculation.The method described in the present invention does not need to use solvents and alkaline solution, nor does it need to perform high temperature heat treatment of positive poles, and the degree of separation of aluminum foil and positive active substances is high, and the cost is low.

Description

technical field [0001] The invention relates to the recovery and treatment of lithium ion batteries, in particular to a method for separating aluminum foil and positive electrode active materials in waste lithium ion batteries. Background technique [0002] In recent years, thanks to the continuous policy support of the Chinese government, the gradual strengthening of the public's awareness of environmental protection, and the continuous efforts of a number of domestic universities, research institutes and enterprises in the research and development of power batteries, battery management systems, etc., my country's The electric vehicle market has developed rapidly. With the rapid industrialization of new energy vehicles, their sales will increase by leaps and bounds, and the stock of lithium-ion power batteries will also increase exponentially. At the same time, the problem of environmental pollution of waste lithium-ion power batteries and the problem of rational recycling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 刘葵宋春红黄有国李庆余王红强杨生龙范小萍张鹏吴强
Owner GUANGXI NORMAL UNIV
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