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Method for recycling lithium iron phosphate power battery waste slurry

A power battery and lithium iron phosphate technology, which is applied in the recycling field of lithium iron phosphate power battery waste slurry, can solve the problems of poor separation of battery active materials and other problems, and achieve strong operability, high resource recycling efficiency, and simple process Effect

Inactive Publication Date: 2016-11-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, in practice, the separation of battery active materials using this method is very poor, with a considerable amount of positive active material behaving like graphite active material, floating to the top, and a considerable amount of negative active material sinking to the bottom

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Select the production waste slurry to be packed in a container, put it in an oven and pass it under argon protection, heat it to 300 ° C, keep it warm for 1 hour, add a solvent to the slurry after heating and pretreatment, the solvent is acrylate and PVA polyethylene Alcohol mixture, the addition amount is 25% of the total amount of the slurry, placed in a propeller stirrer and stirred for 2 hours, the stirring speed is 8m / s, the stirred mixed slurry is placed in a centrifuge test tube, and adjusted to the speed of the centrifuge The centrifugation time is 2000r / min, and the centrifugation time is 1h. Since the solvent density is between the positive active material and the negative active material, the positive and negative active materials after centrifugation are distributed on the bottom and top of the test tube. The materials were dried at 100°C for 2 hours, and the solvent in the middle was packed for use; the dried positive and negative materials were ground, pass...

Embodiment 2

[0021] Select the production waste slurry to be packed in a container, place it in an oven and pass it under argon protection, heat it to 200°C, keep it warm for 2 hours, add a solvent to the slurry after heating pretreatment, the solvent is acrylate and PVA polyethylene Alcohol mixture, the addition amount is 20% of the total amount of the slurry, placed in a propeller stirrer and stirred for 3 hours, the stirring speed is 5m / s, the stirred mixed slurry is placed in a centrifuge test tube, and adjusted to the speed of the centrifuge The centrifugation time is 1000r / min, and the centrifugation time is 1.5h. Since the solvent density is between the positive active material and the negative active material, the positive and negative active materials after centrifugation are distributed on the bottom and top of the test tube. The powder is dried at 200°C for 0.5h, and the solvent in the middle is stored for use; the dried positive and negative materials are ground and passed throu...

Embodiment 3

[0023] Select the production waste slurry to be packed in a container, put it in an oven and pass it under argon protection, heat it to 400°C, keep it warm for 1.5h, add a solvent to the slurry after heating and pretreatment, the solvent is acrylate and PVA polymer The mixture of vinyl alcohol, the addition amount is 15% of the total amount of the slurry, placed in a propeller stirrer and stirred for 1h, the stirring speed is 10m / s, the stirred mixed slurry is placed in a centrifuge test tube, and transferred to a centrifuge The rotation speed is 3000r / min, and the centrifugation time is 2h. Since the solvent density is between the positive active material and the negative active material, the positive and negative active materials after centrifugation are distributed on the bottom and top of the test tube. The powder is dried at 150°C for 1.5 hours, and the solvent in the middle is stored for use; the dried positive and negative electrodes are ground and passed through 100-mes...

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PUM

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Abstract

The invention discloses a method for recycling lithium iron phosphate power battery waste slurry, comprising: heating the waste slurry in an inert atmosphere, adding a solvent, and mechanically stirring and mixing; placing mixed slurry in a container, centrifugally separating, subjecting separated upper and lower slurries to suction filtration to obtain wet powder, drying the wet powder, and using middle solvent as a solvent for reuse; screening and subpackaging the dried slurry. The slurry is thermally pretreated first, the anode and cathode slurry materials are then recycled by means of solvent adding and centrifugal separation, the solvent is reusable, and the method has the advantages such as good process simplicity, high operability, and high resource recycling efficiency.

Description

technical field [0001] The invention belongs to the field of battery recycling and processing, and in particular relates to a method for recycling waste slurry of lithium iron phosphate power batteries. Background technique [0002] Since the advent of lithium-ion batteries, they have been favored by people due to their advantages such as high voltage, high specific energy, and long life. With the continuous development of scientific research and people's daily needs, lithium-ion batteries are widely used in mobile phones and notebook computers. , Camcorders, digital cameras and other civilian and military applications. With the widespread application of lithium-ion batteries, the production and consumption are increasing year by year, and the amount of scrap is also increasing, and a large number of them have entered the stage of failure and recycling, which has caused huge pressure on the environment. How to recycle waste lithium-ion batteries and recycle resources has be...

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 陈兵胡家佳王晨旭曹利娜
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY