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Lithium-ion batteries recycling process

A lithium-ion battery and ion battery technology, applied in battery recycling, secondary batteries, recycling technology, etc., can solve the problem of inability to process battery purification and value-added elements

Active Publication Date: 2020-07-14
锂离子回收公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even smaller pilot plants are still in the R&D stage and cannot handle all the different cell compositions and purify value-added elements in an economical way

Method used

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  • Lithium-ion batteries recycling process
  • Lithium-ion batteries recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0100] All processes of the battery recycling method described in the following examples were carried out continuously at laboratory scale. They include mincing, grinding, sieving, electrolyte solvent extraction, leaching, precipitation (sulfide, hydroxide, and carbonation), solvent extraction, electrowinning, and crystallization. First, the battery is roughly shredded, and the electrolyte solvent is recovered by evaporation. The chopped solids are then finely ground, then sieved and magnetized to remove plastic and iron respectively and leached. Na 2 S was added to the leachate to obtain sulfide precipitation, and then the pH of the resulting leachate was increased to obtain hydroxide precipitation. The leachate is then contacted with an organic solvent. This organic solvent is then washed, stripped, and finally transferred to an electrowinning cell. The pH of the aqueous solution is raised again to obtain nickel hydroxide. Afterwards, the temperature is lowered to remov...

Embodiment II

[0114] The method of Example 1 was repeated, except that three other operations were added: sieving, magnetic iron removal and reuse of the final aqueous solution containing a small amount of lithium.

[0115] Sieving is used to separate the metal powder from unwanted residue (plastic and metal parts) before leaching the metal powder. Small parts of iron are then removed by magnetic force. These two added actions help reduce the amount of iron precipitation and hydroxide filtration time.

[0116] Recycling the final aqueous solution containing a small amount of lithium back to the leaching step not only complies with environmental standards and saves water, but also recovers the remaining lithium that has not been carbonated.

[0117] Table 2

[0118]

Embodiment III

[0120] In this embodiment, in order to further improve the efficiency of the leaching operation, the leaching operation is repeated.

[0121] The efficiency of the leaching operation can be improved by optimizing the leaching parameters. Use a reducing agent such as 10g / L aluminum (foil) or 4g / L manganese dioxide to replace some or all of the hydrogen peroxide. Add 1.6mL / g H 2 o 2 and 4g / L MnO 2 seems to be the most effective.

[0122]

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Abstract

It is provided a process for recycling lithium ion batteries comprising shredding the lithium-ion batteries and immersing residues in an organic solvent; feeding the shredded batteries residues in a dryer producing a gaseous organic phase and dried batteries residues; feeding the dried batteries residues to a magnetic separator removing magnetic particles; grinding the non-magnetic batteries residues; mixing the fine particles and an acid producing a metal oxides slurry and leaching said metal oxides slurry; filtering the leachate removing the non-leachable metals; feeding the leachate into asulfide precipitation tank; neutralizing the leachate; mixing the leachate with an organic extraction solvent; separating cobalt and manganese from the leachate using solvent extraction and electrolysis; crystallizing sodium sulfate from the aqueous phase; adding sodium carbonate to the liquor and heating up the sodium carbonate and the liquor producing a precipitate of lithium carbonate; and drying and recuperating the lithium carbonate.

Description

technical field [0001] A method for recycling lithium-ion batteries is provided. Background technique [0002] Most lithium-ion battery recycling methods today have a huge environmental footprint and fail to recover many valuable materials. Materials used to make lithium-ion batteries, such as lithium and cobalt, are expected to be threatened in the near future, and alternative sources of these materials must be used to keep lithium-ion batteries affordable. Recycling is also essential in order to obtain a positive environmental impact from the use of electric vehicles, since the extraction of raw materials for battery components has a high environmental burden. [0003] Some battery recyclers focus on the mechanical and physical separation of the different components of the shredded battery, such as the casing, current collectors, and electrode materials. These processes typically involve breaking up the battery under a controlled inert atmosphere. The crushed material i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00C22B26/12
CPCC22B1/005C22B7/007C22B26/12H01M10/54C22B3/26Y02W30/84Y02P10/20C01D15/08Y02E60/10C22B1/248C22B23/043C25B1/22H01M10/0525
Inventor 多米尼克·莫林查尔斯·加涅-布尔克埃米莉·纳多贝努瓦·库图尔
Owner 锂离子回收公司