Chemical separating method for aluminum foil in waste lithium ion battery positive plate

A lithium-ion battery and chemical separation technology, which is applied in the field of chemical separation of aluminum foil in waste lithium-ion battery positive plates, can solve the problems of high cost and difficulty in ensuring complete separation, and achieve the effects of convenient screening, simplified procedures, and reduced costs

Active Publication Date: 2012-04-11
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires the use of protective gas, the cost is high, and it is difficult to ensure the complete separation of various mixtures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Cut the positive electrode sheet of the used lithium-ion battery into small pieces, about 5 cm×5 cm;

[0026] (2) Add 0.5 g pole piece into 100mL sodium dodecylbenzenesulfonate solution with a concentration of 0.5 g / L, oscillate ultrasonically for 10 minutes, take it out, wash it to loosen the surface components of the pole piece, and recover the pole piece by filtration.

[0027] (3) N,N-dimethylacetamide solution and N-methylpyrrolidone solution are mixed at a volume ratio of 1:2.5 to form a mixed solution, put the pole piece in the reaction tank, add 100mL N,N-dimethylpyrrolidone Heat the mixed solution of amide and N-methylpyrrolidone to 60 °C, keep the temperature for 2 h, take it out, and wash it with water;

[0028] (4) Put the pole piece in water, ultrasonically vibrate for 10s, and peel off the aluminum foil from the active material, conductive agent and binder of the positive electrode. In this step, the active material, conductive agent and binder of the ...

Embodiment 2

[0031] (1) Cut the positive electrode sheet of the used lithium-ion battery into small pieces, about 5 cm×5 cm;

[0032] (2) Add 1 g of pole piece into 100 mL of sodium lauryl ether sulfate solution with a concentration of 1 g / L, oscillate ultrasonically for 20 minutes, take it out, and clean it to make the surface components of the pole piece loose, and filter and recover the pole piece.

[0033] (3) N,N-dimethylacetamide solution and N-methylpyrrolidone solution are mixed at a volume ratio of 1:3 to form a mixed solution, put the pole piece in the reaction tank, add 100mL N,N-dimethylpyrrolidone Heat the mixed solution of amide and N-methylpyrrolidone to 80 °C, keep the temperature for 1 h, take it out, and wash it with water;

[0034] (4) Place the pole piece in water, ultrasonically vibrate for 20s, and peel off the aluminum foil from the active material, conductive agent and binder of the positive electrode. In this step, the active material, conductive agent and binder o...

Embodiment 3

[0037] (1) Cut the positive electrode sheet of the used lithium-ion battery into small pieces, about 5 cm×5 cm;

[0038] (2) Add 0.8 g pole piece into 100mL nonylphenol polyoxyethylene ether solution with a concentration of 0.8 g / L, oscillate ultrasonically for 15 minutes, take it out, and clean it to loosen the surface components of the pole piece, then filter and recover the pole piece.

[0039] (3) N,N-dimethylacetamide solution and N-methylpyrrolidone solution are mixed at a volume ratio of 1:2.6 to form a mixed solution, put the pole piece in the reaction tank, add 100mL N,N-dimethylpyrrolidone The mixed solution of amide and N-methylpyrrolidone was heated to 70 °C, kept at a constant temperature for 2 h, taken out, and washed with water;

[0040] (4) Place the pole piece in water, ultrasonically vibrate for 15s, and peel off the aluminum foil from the active material, conductive agent and binder of the positive electrode. In this step, the active material, conductive age...

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Abstract

The invention discloses a chemical separating method for an aluminum foil in a waste lithium ion battery positive plate. The method comprises the following steps of: (1) adding the waste lithium ion battery positive plate into a surfactant solution, performing ultrasonic oscillation treatment to loosen surface components of the positive plate, washing, drying, filtering and recovering the positive plate; (2) putting the positive plate treated in the step (1) into a mixed solution of N, N-dimethylacetamide and N-methylpyrrolidone, heating, taking the positive plate out, and washing with water; (3) putting positive plate treated in the step (2) into water, performing ultrasonic oscillation till the aluminum foil as well as active substances of an anode, a conducting agent and a bonding agent; and (4) filtering a solution obtained in step (3), washing to obtain a mixture containing the active substances, the conducting agent, the bonding agent and the aluminum foil, and screening to obtain a dissociative aluminum foil sheet. In the method, the aluminum foil sheet can be recovered directly; and compared with the conventional method for extracting an aluminum foil after dissolving with alkali, the chemical separating method has the advantages: the process is simplified, and cost is lowered.

Description

technical field [0001] The invention relates to a method for separating aluminum foil from a positive electrode sheet of a waste lithium ion battery, in particular to a method for chemically separating the aluminum foil from the positive electrode sheet of a waste lithium ion battery. Background technique [0002] As the use of lithium batteries continues to grow, more and more waste and debris are generated during the manufacturing process of lithium batteries. Many lithium battery manufacturers and waste disposal units process such industrial waste by cutting, crushing, drying, acid-dissolving, and separating the batteries to obtain the required metals or compounds. Although this treatment method extracts some useful rare elements, the use of other chemical substances in the extraction process destroys all components indiscriminately, forming by-products with multiple components, which cannot meet the requirements of efficient and high-selection recovery. [0003] At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54B09B3/00C22B7/00
CPCY02E60/12Y02P10/20Y02W30/84
Inventor 李长东欧彦楠余海军
Owner GUANGDONG BRUNP RECYCLING TECH
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