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
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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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