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Recycling method for valuable element in waste lithium ion battery electrode material

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 large reducing agent consumption, high equipment requirements, and high cost, so as to reduce costs and material losses, reduce recycling costs, and improve The effect of recovery

Inactive Publication Date: 2018-05-11
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These "strong acid + reducing agent" methods can effectively recover valuable metal ions. The reducing agent can reduce the high-valent metal ions in the active material to a low-valence state, which is conducive to improving the leaching rate, but it needs to consume a large amount of reduction in the recovery process. agent and inorganic acid, the cost is high, the equipment requirements are high, and it is easy to cause environmental pollution, and these methods only recycle the positive electrode material, and do not recycle the negative electrode material

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, calcination under the air, the calcination temperature is 700 ℃, and keep 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 and lithium, the leaching residue is used to recover carbon materials. The analysis results show that the leaching rates in terms of ...

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, calcination under the air, the calcination temperature is 600 ℃, and keep warm 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 and Lithium, leach residues are used to recover carbon materials. The analysis results show that the leaching rates in terms of slag are 91.87% for lithium, 91.92% for nickel, 91.96% for cobalt, and 91.82% 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 air 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 and lithium, the leaching residue is used to recover carbon materials. The analysis results show that the leaching rates in terms of slag are 88.1...

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Abstract

A recycling method for a valuable element in a waste lithium ion battery electrode material comprises the following steps of roasting the waste lithium ion battery electrode material in air to obtainroasting slag, wherein the roasting temperature is 400-900 DEG C, and the heat preservation time is 30-300 minutes; and mixing the roasting slag and an acid solution with [H+] concentration being 0.5-9mol / L according to a mass ration being 1:(2-10), performing leaching under a leaching temperature being 30-95 DEG C and leaching time being 1-9 hours, and performing filtering to obtain a leaching liquid and leaching slag, wherein the leaching liquid is used for recycling nickel, cobalt, manganese, aluminum and lithium, and the leaching slag is used for recycling a carbon material. According to the recycling method, a positive electrode material and a negative electrode material of a battery are not needed to be separated, no extra leaching reduction agent is added, the recycling cost is reduced, the positive electrode material and the negative electrode material can be simultaneously recycled, and the recycling economic benefit of the lithium battery is 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] With the rapid development of lithium-ion batteries, lithium-ion batteries have occupied the portable consumer electronics market, and continue to expand to new energy electric vehicles and other fields. my country has become the world's largest producer, consumer and exporter of lithium batteries. It is estimated that by 2020, the demand for power lithium-ion batteries will reach 125Gwh, and the amount of scrap will reach 2.2Gwh, about 500,000 tons. By 2023, the amount of scrap will reach 101Gwh, about 1.16 million tons. In short, power battery recycling is related to safety, pollution, and resource issues, and also affects the sustainable development of new energy vehicles. The development of waste lithium-ion battery recycling technology is not o...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 刘志强李伟王东兴曹洪杨张魁芳饶帅朱薇郭秋松金明亚高远陶进长
Owner GUANGDONG INST OF RARE METALS
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