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Method for recycling graphite and copper foil from scrapped lithium ion battery negative pole piece

A lithium-ion battery and negative electrode technology, which is applied in the field of recycling of scrap lithium-ion batteries, can solve the problems of high recycling cost, high solution viscosity, and high requirements for equipment anti-corrosion, so as to achieve no secondary pollution, low requirements, easy-to-use effects

Active Publication Date: 2014-08-13
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the method of using acidic solution and alkaline solution to separate the graphite and copper foil on the negative electrode sheet of the scrap lithium ion battery and recycle the carbon material and copper foil has high requirements for equipment anti-corrosion and high recovery cost during the separation process, and Disadvantages of consuming a large amount of water to clean graphite and copper foil before further processing after graphite and copper foil are separated
However, the currently reported method of using deionized water or water to soak the negative electrode sheet of the spent lithium-ion battery, and then reclaiming the carbon material and copper foil through filtration has the disadvantage that the filtration speed is very slow due to the high viscosity of the solution before filtration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Prepare a mixed solution at a ratio of 5:1 according to the volume ratio of the volume of water to ethanol (ml / ml), and then set the volume ratio (g / ml) of 1:20 according to the mass of the negative electrode sheet to the mixed solution Put the negative electrode sheet into a container containing the mixed solution and stir it with an electric stirrer at a stirring speed of 100r / min for 5min, and the temperature of the water during the stirring process is 20°C. After stopping the stirring, sieve the contents in the container with a sieve with a pore size of 6 mm, wash the sieve with water once, and dry naturally to obtain copper foil. After heating the undersize to 80°C, carry out suction filtration. During the suction filtration, keep the temperature of the mixed liquid before filtration at 80°C. After the suction filtration, wash the filter with water once, and dry naturally to obtain graphite.

Embodiment 2

[0013] Example 2: Prepare a mixed solution according to the ratio of 10:1 according to the volume ratio of the volume of water to ethanol (ml / ml), and then according to the mass of the negative plate and the volume ratio (g / ml) of the mixed solution is 1:20 Put the negative electrode sheet into a container containing the mixed solution and stir it with an electric stirrer at a stirring speed of 100r / min for 8min, and the temperature of the water during the stirring process is 20°C. After stopping the stirring, sieve the contents in the container with a sieve with a pore size of 6 mm, wash the sieve with water once, and dry naturally to obtain copper foil. After heating the undersize to 80°C, carry out suction filtration. During the suction filtration, keep the temperature of the mixed liquid before filtration at 80°C. After the suction filtration, wash the filter with water once, and dry naturally to obtain graphite.

Embodiment 3

[0014] Example 3: Prepare a mixed solution at a ratio of 10:1 according to the volume ratio of water to ethanol (ml / ml), and then prepare a mixed solution according to the mass of the negative plate and the volume ratio (g / ml) of the mixed solution to 1:40 Put the negative electrode sheet into a container containing the mixed solution and stir it with an electric stirrer at a stirring speed of 150r / min for 5min, and the temperature of the water during the stirring process is 20°C. After the stirring is stopped, the material in the container is sieved with a sieve with a hole diameter of 8mm, and the sieve is washed once with water, and then naturally dried to obtain copper foil. After heating the undersize to 80°C, carry out suction filtration. During the suction filtration, keep the temperature of the mixed liquid before filtration at 80°C. After the suction filtration, wash the filter with water once, and dry naturally to obtain graphite. The separation rate of graphite and ...

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Abstract

The invention relates to a method for recycling graphite and copper foil from a scrapped lithium ion battery negative pole piece. The method comprises the following steps: charging and dismantling the scrapped lithium ion battery, placing the negative pole piece into a vessel with a water and ethanol mixed solution, then screening after stirring for a period of time, washing a substance on a sieve by utilizing water, and naturally drying the substance to obtain copper foil; heating a substance below the sieve to 70 to 90 DEG C, then filtering the substance, maintaining the temperature of the solution before the filtering at 70 to 90 DEG C in the filtering process, washing the substance on the sieve by utilizing water after the filtering is finished, and naturally drying the substance to obtain graphite. Compared with the prior art, the method has the advantages that easiness in operation is realized, the requirement on a separation device is low, the efficiency for separating the graphite and copper foil is high, the cost is low, and no secondary pollution is produced in the separation process.

Description

technical field [0001] The invention relates to the recycling technology of scrap lithium ion batteries. Background technique [0002] Lithium-ion batteries have a series of advantages such as small size, light weight, high energy density, high working voltage, long cycle life and no memory effect, and have been widely used in cameras, mobile phones, notebook computers, cameras, portable measuring instruments, charging In addition, it is also an optional high-energy power source for electric vehicles and energy storage power stations in the future. After the service life of lithium-ion batteries has expired, its subsequent reasonable treatment is an important issue to be solved. [0003] At present, the negative electrode sheet obtained after the dismantling of the scrap lithium-ion battery or the leftovers and electrode fragments produced in the production process of the lithium-ion battery negative electrode sheet generally need to separate the active material graphite on...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54C22B7/00B09B3/80Y02W30/84
Inventor 王大辉文豪
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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