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A method for recovering valuable elements in waste lithium-ion battery electrode materials

A lithium-ion battery and electrode material technology, which is applied in the field of recycling waste lithium battery electrode materials, can solve the problems of increased cost, low nickel-cobalt-manganese leaching rate, low recovery rate, etc., to achieve recycling, reduce battery sorting and Recovery cost and the effect of reducing recovery cost

Active Publication Date: 2019-08-30
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above method are as follows: 1) The leaching rate of nickel, cobalt and manganese is not high, resulting in a low recovery rate; 2) Adding hydrogen peroxide or sodium sulfite as a reducing agent during the leaching process increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] After crushing and sorting waste lithium-ion batteries containing nickel-cobalt-manganese positive electrode materials, a mixture of positive electrode materials, negative electrode graphite powder and part of the electrolyte is obtained, containing 15%wt of nickel, 8%wt of cobalt, 10%wt of manganese, and 5% of lithium. %wt, carbon 35%wt, fluorine 1.2%wt, calcining under nitrogen atmosphere, the calcining temperature is 500 ℃, and keep it warm for 30 minutes. The roasted slag in [H + ] The sulfuric acid solution with a concentration of 0.5mol / L is mixed according to the mass ratio of 1:10, and leached at a leaching temperature of 90°C and a leaching time of 1h. After the leaching is completed, filter and separate to obtain the leaching solution and leaching residue; the leaching solution is used for further recovery of nickel and cobalt , manganese, lithium, and the leaching residue are used to prepare negative electrode materials. The analysis results show that the le...

Embodiment 2

[0014] After crushing and sorting waste lithium-ion batteries containing nickel-cobalt-aluminum cathode materials, a mixture of cathode materials, negative electrode graphite powder, and part of the electrolyte is obtained, containing 30%wt of nickel, 6%wt of cobalt, 5%wt of aluminum, and 4% of lithium. %wt, carbon 20%wt, fluorine 0.5%wt, calcined in an argon atmosphere, the calcined temperature is 600 ℃, and kept for 60 minutes. The roasted slag in [H + ] The hydrochloric acid solution with a concentration of 1mol / L is mixed according to the mass ratio of 1:8, and leached at a leaching temperature of 70°C and a leaching time of 3h. Manganese, lithium, and leached slag are used to prepare negative electrode materials. The analysis results show that the leaching rates in terms of slag are 90.97% for lithium, 92.75% for nickel, 91.78% for cobalt, and 90.77% for aluminum.

Embodiment 3

[0016] After crushing and sorting waste lithium-ion batteries containing different proportions of nickel-cobalt-manganese cathode materials, a mixture of cathode materials, negative electrode graphite powder, and part of the electrolyte is obtained, which contains 22%wt of nickel, 12%wt of cobalt, and 6% of manganese wt, aluminum 0.01%wt, lithium 2%wt, carbon 30%wt, fluorine 1.0%wt, were calcined in a carbon dioxide atmosphere at 400°C and kept for 120 minutes. The roasted slag in [H + ] Sulfuric acid solution and hydrochloric acid solution with a concentration of 2mol / L are mixed at a mass ratio of 1:6, and leached at a leaching temperature of 50°C and a leaching time of 5h. After the leaching is completed, filter and separate to obtain the leaching solution and leaching residue; the leaching solution is used to further recover nickel , cobalt, manganese, lithium, and the leaching residue are used to prepare negative electrode materials. The analysis results show that the le...

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Abstract

The invention discloses a method for recovering valuable elements in waste lithium ion battery electrode materials. The method comprises steps of roasting the waste lithium ion battery electrode materials in an inert gas atmosphere, the roasting temperature is 200 -600 DEG C, the time is 30-360 minutes, and the roasting slag is obtained; mixing the obtained roasting slag and an acidic solution with [H+] concentration of 0.5~8 mol / L according to the mass ratio of 1:3~10; leaching at the leaching temperature of 30-90 DEG C and leaching time of 1-8 hours, leach liquor and leach residues are filtered to be obtained; the leach liquor is used for recovering nickel, cobalt, manganese, aluminum and lithium, and the leach residues are used for preparing negative electrode materials. According to the method for recovering valuable elements in waste lithium ion battery electrode materials, a leaching reducing agent does not need to be additionally added, the battery sorting and recycling costs are reduced, the positive and the negative electrode materials can be recovered at the same time, and the economic benefits of lithium battery recovery can be improved.

Description

technical field [0001] The invention belongs to a recycling method for waste lithium battery electrode materials, in particular to a recycling method for ternary materials of lithium ion batteries. Background technique [0002] my country has become the world's largest producer, consumer and exporter of lithium batteries, and the cumulative sales of electric vehicles will reach 5 million in 2020. With the soaring sales of electric vehicles, the problem of soaring power battery scrap will become more and more prominent. Spent batteries still have high-voltage direct current, so there is a risk of combustion and explosion. Compared with lead-acid batteries, power batteries have no lead pollution, but they also have phosphorus, cobalt, nickel and other pollution. my country's emission standards for heavy metals cobalt and nickel are <0.5 mg / L. Therefore, if it is not properly disposed of, it will cause great pollution to the environment. In addition, my country's cobalt a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B7/00C22B23/00C22B47/00C22B21/00C22B26/12H01M10/54H01M10/0525
CPCC22B1/02C22B7/007C22B21/0023C22B23/0423C22B23/043C22B26/12C22B47/00H01M10/0525H01M10/54Y02E60/10Y02P10/20Y02W30/84
Inventor 李伟刘志强王东兴曹洪杨郭秋松朱薇张魁芳金明亚高远
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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