Method for recycling waste lithium ion battery anode materials based on deep-eutectic solvent nanofluid

A deep eutectic solvent and lithium-ion battery technology, which is applied in secondary batteries, battery recycling, recycling technology, etc., can solve problems such as non-recyclability, environmental hazards, and difficult operation, and achieve a wide range of raw material sources, The effect of short time consumption and convenient operation

Active Publication Date: 2020-04-28
CHINA UNIV OF MINING & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid leaching-precipitation method is significantly more efficient than the solid-phase method in recovering the positive electrode material of lithium-ion batteries. However, since most of the required solvents are inorganic acids that cannot be reused and are harmful to the environment, it is still in the laboratory. research stage
The gentle recovery method achieves the maximum recovery of all valuable metal elements, but the process is too long and the operation is very difficult, and it is even more difficult to apply it in actual production

Method used

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  • Method for recycling waste lithium ion battery anode materials based on deep-eutectic solvent nanofluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add 20.0g (0.333mol) of urea (0.333mol) and 15.5g (0.111mol) of choline chloride into a reactor equipped with magnetic stirring, mix at room temperature, heat to 60°C and stir for 0.5 hours at a stirring speed of 600r / min, cool to room temperature after reaction finishes, obtain urea / choline chloride deep eutectic solvent;

[0026] (2) Add 3.55mg (0.01wt.%) of sodium dodecylbenzenesulfonate to the deep eutectic solvent obtained in step (1), heat to 60°C, stir and mix evenly, then add 0.071g of aluminum oxide (0.2wt.%), and stirred at 60°C for 1 hour, and the stirring speed was 600r / min to obtain a mixed solution;

[0027] (3) Put the mixed solution obtained in step (2) into an ultrasonic cell pulverizer, and ultrasonically disperse for 1 hour at 25° C. to obtain urea / choline chloride deep eutectic solvent nanofluid;

[0028] (4) After fully discharging the waste nickel-cobalt lithium manganese oxide battery, peel off the shell, disassemble the battery to obtain th...

Embodiment 2

[0032] (1) Add 30.0g (0.333mol) of oxalic acid (0.333mol) and 13.0g (0.111mol) of betaine to a reactor equipped with magnetic stirring, mix at room temperature, heat to 60°C and stir for 1 hour at a stirring speed of 800r / min , cool to room temperature after the reaction finishes, obtain oxalic acid / choline chloride deep eutectic solvent;

[0033] (2) Add 12.9mg (0.03wt.%) of sodium lauryl sulfate to the deep eutectic solvent obtained in step (1), stir and mix after heating to 60°C, then add 0.215g (0.5wt.%) of silicon dioxide .%), and stirred at 60° C. for 1.5 hours at a stirring speed of 800 r / min to obtain a mixed solution;

[0034] (3) Put the mixed solution obtained in step (2) into an ultrasonic cell pulverizer. Ultrasonic dispersion at 25°C for 1 hour to obtain oxalic acid / betaine deep eutectic solvent nanofluid;

[0035] (4) After fully discharging the waste nickel-cobalt lithium manganese oxide battery, peel off the shell, disassemble the battery to obtain the waste...

Embodiment 3

[0039] (1) Add 20.7g (0.333mol) of ethylene glycol (0.333mol) and 15.5g (0.111mol) of choline chloride into a reactor equipped with magnetic stirring, mix at room temperature, heat to 80°C and stir for 1.5 hours. Be 600r / min, be cooled to room temperature after reaction finishes, obtain ethylene glycol / choline chloride deep eutectic solvent;

[0040] (2) Add polyvinyl alcohol 18.1mg (0.05wt.%) to the deep eutectic solvent obtained in step (1), stir and mix after heating to 80°C, then add titanium dioxide 0.362g (1.0wt.%), and Stir at 80°C for 1 hour at a stirring speed of 600r / min to obtain a mixed solution;

[0041] (3) Put the mixed solution obtained in step (2) into an ultrasonic cell pulverizer. Ultrasonic dispersion at 25°C for 1.5 hours to obtain ethylene glycol / choline chloride deep eutectic solvent nanofluid;

[0042] (4) After fully discharging the waste nickel-cobalt lithium manganese oxide battery, peel off the shell, disassemble the battery to obtain the waste po...

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Abstract

The invention discloses a method for recycling waste lithium ion battery anode materials based on deep-eutectic solvent nanofluid. The method mainly comprises the following several steps that (1) a dispersing agent and nano particles are sequentially added into a deep-eutectic solvent, and nanofluid with the deep-eutectic solvent as base fluid is prepared through stirring and ultrasonic treatment;(2) waste lithium ion batteries are disassembled after being completely discharged, and anode plates are obtained through separation; and (3) the anode plates are added into a prepared deep-eutecticsolvent nanofluid solution, stirring is carried out for 24-72 h under the temperature ranging from 25 DEG C to 220 DEG C, filtering is carried out, and the contents of valuable metal elements nickel,cobalt and lithium in the reacting solution are detected. The deep-eutectic solvent nanofluid is used for recycling the lithium ion battery anode materials, the process is simple, the recovery rate ofvaluable metal is high, and application and popularization are easy.

Description

technical field [0001] The invention belongs to the field of recycling waste lithium-ion battery materials, and in particular relates to a method for recycling lithium-ion battery cathode materials based on deep eutectic solvent nanofluids. Background technique [0002] Lithium-ion batteries are widely used in electronic products, electric bicycles, electric vehicles, and aerospace due to their long cycle life, good low-temperature discharge performance, strong charge retention, high specific energy, wide operating temperature range, and short charging time. and other fields. Followed by a large number of discarded lithium-ion batteries, according to statistics, it is estimated that by 2020, the quality of discarded lithium-ion batteries in the world will reach 500,000 tons, and the recycling of lithium-ion batteries will face severe challenges. [0003] The current recovery methods for cathode materials of lithium-ion batteries still mainly use solid-phase method, acid lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B26/12H01M10/0525H01M10/54
CPCC22B7/006C22B23/0407C22B26/12H01M10/0525H01M10/54Y02E60/10Y02P10/20Y02W30/84
Inventor 饶中浩刘昌会曹玉棋贺靖峰段晨龙赵跃民
Owner CHINA UNIV OF MINING & TECH
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