Method for selectively leaching metal components in waste lithium cobalt oxide battery by using polyethylene glycol-citric acid solvent

A technology of polyethylene glycol and metal components, which is applied in the field of selective leaching of metal components of waste lithium cobaltate batteries with mixed solvents, can solve the problems of inability to separate active materials, and achieve high leaching efficiency, strong selectivity, and easy operation Effect

Active Publication Date: 2021-07-02
QUZHOU RES INST OF ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current industrial pretreatment techniques cannot completely separate the active material from these impurity metals compared to manually disassembled cathode materials

Method used

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  • Method for selectively leaching metal components in waste lithium cobalt oxide battery by using polyethylene glycol-citric acid solvent
  • Method for selectively leaching metal components in waste lithium cobalt oxide battery by using polyethylene glycol-citric acid solvent
  • Method for selectively leaching metal components in waste lithium cobalt oxide battery by using polyethylene glycol-citric acid solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of mixed solvent that is made up of polyethylene glycol-citric acid is used for selectively leaching metal in lithium cobalt oxide battery, and concrete implementation steps are as follows:

[0039] 1) Weigh lithium cobalt oxide powder and copper powder (200 mesh), and configure materials with a mass ratio of 2;

[0040] 2) After mixing polyethylene glycol 200 and citric acid at a molar ratio of 1:1 at room temperature, stir at 80°C in a collector-type water bath magnetic stirrer until a clear and transparent solution is obtained to prepare a solvent ;

[0041] 3) Add the material obtained in step (1) into the solvent obtained in step (2) according to the mass ratio of 1:1000, stir at 80°C, and leaching for 5h;

[0042] 4) During the leaching period, a small amount of the mixed solution was taken out at intervals of 1 hour, diluted ten times with water, and the insoluble matter was filtered to obtain a liquid sample.

[0043] 5) Using atomic absorption spectromet...

Embodiment 2

[0045] 1) Weigh lithium cobalt oxide powder and copper powder (200 mesh), and configure materials with a mass ratio of 2:1;

[0046] 2) After mixing polyethylene glycol 200 and citric acid at a molar ratio of 2:1 at room temperature, stir in a collector-type water bath magnetic stirrer at 60°C until a clear and transparent solution is obtained to prepare a solvent ;

[0047] 3) Add the material obtained in step (1) into the solvent obtained in step (2) according to the mass ratio of 1:500, stir at 80°C, and leaching for 5 hours;

[0048] 4) During the leaching period, a small amount of mixed solution was taken out at intervals of 1 hour, added to dilute ten times, and the insoluble matter was filtered out to obtain a liquid sample.

[0049] 5) Using atomic absorption spectrometry to analyze the metal content of the liquid extracted at different reaction times. The results showed that when the leaching time was 3 hours, the lithium metal content in the reaction gained liquid ...

Embodiment 3

[0051] 1) Weigh lithium cobalt oxide powder and copper powder (200 mesh), and configure materials with a mass ratio of 2:1;

[0052] 2) After mixing polyethylene glycol 200 and citric acid at a molar ratio of 1:1 at room temperature, stir at 80°C in a collector-type water bath magnetic stirrer until a clear and transparent solution is obtained to prepare a solvent ;

[0053] 3) Add the material obtained in step (1) into the solvent obtained in step (2) according to the mass ratio of 1:100, stir at 100°C, and leaching for 8 hours;

[0054] 4) During the leaching period, a small amount of the mixed solution was taken out at intervals of 1 hour, diluted ten times with water, and then the insoluble matter was filtered to obtain a liquid sample.

[0055] 5) After the solution is prepared, the metal content of the liquid extracted at different reaction times is analyzed by atomic absorption spectrometry. Adopt standard curve method to measure, be 2 hours in leaching time, lithium ...

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Abstract

The invention discloses a method for selectively leaching metal components in a lithium cobalt oxide battery by using a polyethylene glycol-citric acid mixed solvent. The method comprises the following steps of 1) mixing and stirring polyethylene glycol and citric acid under a heating condition to form a uniform mixed solvent; 2) obtaining the waste lithium cobalt oxide battery; (3) adding the waste battery into the mixed solvent prepared in step (1), and performing full stirring and heating for leaching; and 4) adding water for dilution, filtering out insoluble impurities in a solution obtained after step 3) to obtain a leaching solution, and recovering the metal components in the waste battery. The method adopts the polyethylene glycol-citric acid solvent to leach the metal components in the lithium cobalt oxide battery, cobalt and lithium are selectively leached, aluminum foil and copper foil of a current collector do not need to be peeled off in a pretreatment stage, the leaching rate is high, the selectivity is good, the economical efficiency is good, and the method is environment-friendly and has relatively high industrial popularization value.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of waste lithium batteries, and is designed to recycle metal materials of waste lithium ion batteries, in particular to a mixed solvent formed by mixing polyethylene glycol and citric acid to selectively leach waste lithium cobaltate battery metals method of ingredients. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, small size, light weight, long cycle life, and no memory effect. Lithium-ion batteries are more and more widely used. Lithium cobalt oxide is often used as the positive electrode material of lithium-ion batteries. It has excellent electrochemical performance and is often used as a power source for small portable electronic devices. But its life is limited, but from the perspective of environmental protection and economy, the problem of efficient recycling of waste lithium cobalt oxide batteries needs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12C22B23/00H01M10/54
CPCC22B7/006C22B23/0407C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 曾静何潮洪吴可君
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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