Method for recycling active substances from waste pieces of positive poles of lithium ion batteries

A lithium-ion battery and active material technology, which is applied in the field of recovery and reuse of active materials on positive electrode waste, can solve the problems of increased viscosity of organic solvents, high economic costs, poor recycling performance, etc., to achieve increased viscosity and simple process , Save the effect of crushing process

Inactive Publication Date: 2014-03-05
HENAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, according to the principle of similar miscibility, the organic solvent that can dissolve the binder PVDF again is extremely rare. At the same time, the amount of organic solvent required to dissolve the binder PVDF with an organic solvent is relatively large. With the increase in the amount of the binder PVDF dissolved in the organic solvent increase, the viscosity of the organic solvent used as a dissolving agent will increase, the performance of recycling will be poor, and the economic cost will be higher

Method used

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  • Method for recycling active substances from waste pieces of positive poles of lithium ion batteries
  • Method for recycling active substances from waste pieces of positive poles of lithium ion batteries
  • Method for recycling active substances from waste pieces of positive poles of lithium ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0017] (1) For collected ternary materials (LiCo x Ni y mn z o 2 , x+y+z=1) Sorting the waste positive electrode of the secondary battery, cleaning the waste positive electrode with dirty surface with water, ethanol, acetone or N-methylpyrrolidone to clean the surface and proceed to step (2) , the clean positive electrode waste can directly enter step (2);

[0018] (2) Add 50g of clean positive electrode waste to the expansion agent of dimethyl sulfoxide and ethanol with a mass percentage of dimethyl sulfoxide of 50%, so that the drug film surface on the positive electrode waste is in effective contact with the expansion agent , the temperature of the solution was kept at 60°C for 0.2 h, stirring or ultrasonication would help the drug film surface to fall off the aluminum foil quickly;

[0019] (3) Sieve or pick out the aluminum foil that is separated from the drug film surface, centrifuge, settle, sieve or filter the expansion agent containing the drug film surface to ach...

Embodiment 2

[0027] (1) For collected LiMn 2 o 4 Sorting the positive electrode waste of the secondary battery, cleaning the positive electrode waste with dirty surface with water, ethanol, acetone or N-methylpyrrolidone, making the surface clean and then proceeding to step (2), the clean positive electrode waste can be directly entered step (2);

[0028] (2) Put 50g of clean positive electrode waste into the expansion agent of dimethyl sulfoxide and water with a mass percentage of dimethyl sulfoxide of 90%, so that the drug film surface on the positive electrode waste is in effective contact with the expansion agent , the solution temperature is kept at 80°C for 0.1h;

[0029] (3) Sieve or sort out the aluminum foil that is separated from the drug film surface, centrifuge or filter the expansion agent containing the drug film surface to achieve solid-liquid separation;

[0030] (4) Wash the centrifuged or filtered solid active substance with 100ml N-methylpyrrolidone for 1-4 times;

...

Embodiment 3

[0036] (1) For collected LiMn 2 o 4 Sorting the positive electrode waste of the secondary battery, cleaning the positive electrode waste with dirty surface with water, ethanol, acetone or N-methylpyrrolidone, making the surface clean and then proceeding to step (2), the clean positive electrode waste can be directly entered step (2);

[0037] (2) Put 50g of the clean positive electrode waste into the expansion agent of dimethyl sulfoxide and acetone with a mass percentage of dimethyl sulfoxide of 20%, so that the drug film surface on the positive electrode waste is in effective contact with the expansion agent , the solution temperature was kept at 19°C for 36h;

[0038] (3) Sieve or sort out the aluminum foil that is separated from the drug film surface, centrifuge or filter the expansion agent containing the drug film surface to achieve solid-liquid separation;

[0039] (4) Wash the centrifuged or filtered solid active substance with 100ml acetone for 1-4 times;

[0040]...

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Abstract

The invention discloses a method for recycling active substances from waste pieces of positive poles of lithium ion batteries. The method comprises the steps of (1) putting the waste pieces of the positive poles of the lithium ion batteries into a swelling agent, wherein the waste pieces of the positive poles is in complete contact with the swelling agent at 19-189 DEG C for 0.1-36 hours; (2) screening or sorting out aluminum foil sheets, filtering, settling, and screening or centrifuging the swelling agent mixture containing active substances, and washing to separate solid active substances and a liquid swelling agent out; (3) drying the solid active substances obtained in step (2) at 40-250 DEG C, adding a lithium source into the dried solid active substances, mixing uniformly, and then calcining by three steps; and (4) after calcining, naturally cooling down a furnace, and then collecting solid substances, namely regenerated positive pole active substances. The regenerated positive pole material recycled by the method has the structure, appearance and component same as that of a material for manufacturing the positive pole of a lithium ion battery, and has stable electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of recovery and reuse of active materials on positive electrode waste sheets produced during the preparation of lithium ion battery positive electrodes, in particular to a method for recovering active materials from lithium ion battery positive electrode waste sheets. Background technique [0002] As an important device for storing electric energy, a clean energy, secondary batteries are directly related to the effective use and effect of electric energy. Therefore, the improvement of the performance of secondary batteries has always been a research hotspot. By the 1990s, with the development of lithium With the advent of ion batteries, their high operating voltage, long cycle life, good safety and other outstanding advantages are more and more favored by people. At present, the cathode material of commercial lithium-ion secondary batteries is LiCoO 2 , LiMn 2 o 4 , LiNiO 2 and LiCo x Ni y mn z o 2 (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 王晓兵娄向东杨林赵晓华梁慧君余文延王栋蔡碧博李忠奇郭建明
Owner HENAN NORMAL UNIV
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