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Recycling process for active material of waste cathode piece of lithium ion battery

A technology for lithium ion batteries and active materials, which is applied in the field of regeneration technology of active materials of waste cathode sheets of lithium ion batteries, can solve the problems of complex process flow, large secondary pollution and high recycling cost, and achieves simple process and low production cost. , the effect of avoiding economic losses

Inactive Publication Date: 2014-03-12
HENAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it often needs to be crushed before acid leaching, and hydrogen peroxide auxiliary oxidation needs to be added in the acid leaching process, which makes this process complicated when recovering the active components of positive electrode waste sheets, and the recycling cost is high and has a large cost. Secondary pollution

Method used

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  • Recycling process for active material of waste cathode piece of lithium ion battery
  • Recycling process for active material of waste cathode piece of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0014] (1) For collected ternary materials (LiCo x Ni y mn z o 2 , x+y+z=1) Sorting the waste positive electrodes of the secondary battery, cleaning the waste positive electrodes with dirty surface with ethanol, acetone or N-methylpyrrolidone to clean the surface and proceed to step (2), Clean positive electrode waste can directly enter step (2);

[0015] (2) Rinse 50g of clean positive electrode waste with 200ml of a stripping agent containing a sulfuric acid solution with a mass concentration of 35% repeatedly, so that the drug film surface on the positive electrode waste is in effective contact with the stripping agent, and the ambient temperature is kept at 30°C. 1h;

[0016] (3) Take out the positive electrode waste sheet in step (2), shake it gently, (ultrasound, stirring can be used) the drug film surface containing the active substance will naturally fall off the aluminum foil, and remove the aluminum foil;

[0017] (4) Wash and filter the shedding solid with 50ml...

Embodiment 2

[0024] (1) For collected LiMn 2 o 4 Sorting the waste positive electrodes of the secondary battery, cleaning the waste positive electrodes with dirty surface with ethanol, acetone or N-methylpyrrolidone, making the surface clean and then proceeding to step (2), the clean positive electrode waste can directly enter the step (2);

[0025] (2) Soak 50g of clean positive electrode waste in 1L of stripping agent containing sulfuric acid solution with a mass concentration of 10%, so that the drug film surface on the positive electrode waste is in effective contact with the stripping agent, and the ambient temperature is maintained at -10°C 36h;

[0026] (3) Take out the positive electrode waste sheet in step (2), shake it gently, (ultrasound, stirring can be used) the drug film surface containing the active substance will naturally fall off from the aluminum foil, and remove the aluminum foil;

[0027] (4) Wash the filtered solid with 50ml of absolute ethanol for 3 times, and the w...

Embodiment 3

[0033] (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 ethanol, acetone or N-methylpyrrolidone, making the surface clean and then proceeding to step (2), the clean positive electrode waste can directly enter the step (2);

[0034] (2) Soak 50g of clean positive electrode waste in 1L of stripping agent containing 90% sulfuric acid solution, so that the drug film surface on the positive electrode waste is in effective contact with the stripping agent, and the ambient temperature is maintained at 120°C at 0.1 h;

[0035] (3) Take out the positive electrode waste sheet in step (2), shake it gently, (ultrasound, stirring can be used) the drug film surface containing the active substance will naturally fall off the aluminum foil, and remove the aluminum foil;

[0036] (4) Wash the filtered solid with 50ml of absolute ethanol for 3 times, and the washed absolute ethanol can be...

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Abstract

The invention discloses a recycling process for an active material of the waste cathode piece of a lithium ion battery. The key points of the technical scheme of the invention are as follows: (1) allowing a release agent to contact with the waste anode piece in the manner of spraying, drip washing, dipping or soaking, and keeping the contact state at the temperature of minus 10 to 120 DEG C for 0.1-36 hours; (2) screening or picking out aluminum foil, filtering or centrifuging the release agent mixture containing the active material, and washing to separate out the solid active material and the liquid release agent; (3) drying the solid active material at the temperature of 40-250 DEG C, adding a lithium source to the dried solid active material, and after thorough mixing, conducting three-step calcining; (4) after the three-step calcining, naturally reducing the furnace temperature, and then collecting the solid material which is the recycled cathode active material. The cathode active material recycled in the invention has the same structure, shape and composition as the material for preparing the cathode of the lithium ion battery, and the electrochemical properties of the cathode active material are stable.

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 secondary battery positive electrodes, in particular to a regeneration process for active materials on positive electrode waste sheets of lithium-ion batteries. 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 secondary batteries is LiCoO 2 , LiMn 2 o 4 , LiNiO 2 and LiCo x Ni y mn z o 2 ( x + y...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 王晓兵赵晓华杨林娄向东梁慧君刘昭王圆圆余文延李忠奇
Owner HENAN NORMAL UNIV
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