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Efficient and clean leaching method for cathode material of failed lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in the field of valuable metal recovery of cathode materials of failed lithium ion batteries, can solve the problems of poor operating environment, long leaching time, production interruption, etc., and achieves short leaching time, high leaching rate, and operation Continuous effect

Inactive Publication Date: 2020-12-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the industry, the leaching of positive electrode materials mainly adopts tank leaching, which has problems such as long leaching time, intermittent production, heavy smell and poor operating environment.

Method used

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  • Efficient and clean leaching method for cathode material of failed lithium ion battery
  • Efficient and clean leaching method for cathode material of failed lithium ion battery
  • Efficient and clean leaching method for cathode material of failed lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The high-efficiency leaching method for the positive electrode material of the dead power lithium-ion battery in this embodiment includes the following steps:

[0033] (1) Prepare the raw materials. At a temperature of 25°C, mix the positive electrode material powder of the spent lithium iron phosphate battery with sulfuric acid (concentration: 1.5mol / L) at a liquid-solid ratio of 10mL / g, stir and mix for 10 minutes, and then mix the slurry Uniform;

[0034] (2) Pump the slurry into the circulation pipeline, slowly add hydrogen peroxide (6% by volume) with a theoretical molar mass of 1.2 times, the leaching temperature is 50°C, the reaction pressure is 0.1MPa, and the fluid flow rate is 2m / s;

[0035] (3) The leaching is completed at 30 min, 60 min, 90 min, and 120 min, respectively, to obtain leaching solution and leaching residue containing lithium ions and iron ions.

[0036] After the above process, the leaching rate of the positive electrode material is as follows...

Embodiment 2

[0038] The high-efficiency leaching method for the positive electrode material of the dead power lithium-ion battery in this embodiment includes the following steps:

[0039] (1) Prepare the raw materials. At a temperature of 25°C, mix the positive electrode material powder of the invalid lithium iron phosphate battery with sulfuric acid with a concentration of 1mol / L, 1.5mol / L, 2mol / L, and 2.5mol / L respectively, according to the liquid-solid ratio 10mL / g for slurry mixing, after stirring and mixing for 20min, the slurry is evenly mixed;

[0040] (2) Pump the slurry into the circulation pipeline, slowly add hydrogen peroxide (6% by volume) with a theoretical molar amount of 1.2 times, the leaching temperature is 50°C, the reaction pressure is 0.2MPa, and the fluid flow rate is 2m / s;

[0041] (3) Be 120min in leaching time, finish leaching, obtain containing lithium ion and iron ion leaching solution and leaching slag, experimental result is as follows figure 2 It can be seen...

Embodiment 3

[0043] The high-efficiency leaching method for lithium-ion battery positive electrode materials of disabled products whose grades are not up to standard in this embodiment includes the following steps:

[0044] (1) Prepare the raw materials. Under the condition of temperature 25°C, the cathode material powder of lithium iron phosphate battery whose grade is not up to the standard is mixed with sulfuric acid with a concentration of 2mol / L according to the liquid-solid ratio of 6mL / g, 8mL / g, 10mL / g, 12mL / g for slurry mixing, after stirring and mixing for 10 minutes, the slurry is evenly mixed;

[0045] (2) Pump the slurry into the circulation pipeline, the leaching temperature is 40°C, the reaction pressure is 0.1MPa, and the fluid flow rate is 1m / s;

[0046] (3) Complete leaching in 15min, obtain leaching liquid and leaching slag, experimental result is as follows image 3 As shown, the change of liquid-solid ratio has little effect on the leaching rate of lithium and iron. W...

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Abstract

The invention discloses an efficient and clean leaching method for a cathode material of a failed lithium ion battery. The method comprises the following steps of mixing an acidic leaching agent withcathode material powder of the failed lithium ion battery for slurry mixing, conveying the obtained slurry into a pipelined leaching device, leaching under the action of turbulence in a leaching pipeline, and filtering and separating after complete leaching in order to obtain valuable metal ion leachate and leaching residues. The method is high in adaptability to raw materials, sufficient in gas-liquid-solid multiphase reaction, low in leaching temperature, short in leaching time, high in leaching rate, good in equipment sealing performance, environment-friendly, simple in equipment, continuous in operation, suitable for large-scale production and good in economic benefit.

Description

technical field [0001] The invention relates to a method for recovering valuable metals from anode materials of invalid lithium-ion batteries, in particular to a method for realizing efficient and rapid leaching of lithium ions from cathode materials of invalid lithium-ion batteries by using a pipeline leaching device, belonging to the technical field of hydrometallurgy . Background technique [0002] Lithium-ion batteries have been unanimously recognized by battery manufacturers and automobile manufacturers due to their advantages such as large capacity, high energy density, no memory effect, and good cycle performance. Under normal circumstances, the service life of lithium-ion batteries is about 3 to 5 years. After many cycles, the structure of the battery will change, and the active material in it will become invalid, resulting in a decrease in battery capacity. According to relevant statistics, large-scale decommissioning of power batteries will occur after 2020, and ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/12C22B47/00C22B23/00C21B15/00
CPCC21B15/00C22B7/007C22B23/0415C22B23/0423C22B23/043C22B23/0438C22B26/12C22B47/00Y02P10/20
Inventor 戴曦苏昊陶成唐红辉
Owner CENT SOUTH UNIV
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