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Method for separating lithium cobalt oxide and aluminum foil on scrapped lithium ion battery positive pole piece

A lithium-ion battery and separation method technology, which is applied in the field of recycling of scrapped lithium-ion batteries, can solve the problems of water pollution and high cost of separation, and achieve the effects of easy operation, low requirements, and no secondary pollution

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

[0005] The purpose of the present invention is to solve the problems of high separation cost and water pollution caused by the introduction of organic solvents into the water-based solvent in the separation process of lithium cobaltate and aluminum foil on the positive electrode sheet of the scrap lithium ion battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: According to the ratio (g / ml) of the mass of the positive electrode sheet to the volume ratio of the ceramic crucible of 1:10, the positive electrode sheet is loaded into the ceramic crucible and placed in a box-type resistance furnace, starting from room temperature at 5°C / min Raise the temperature of the furnace to 500°C at a heating rate of 500°C, and then cut off the power of the box-type resistance furnace after holding the temperature for 0.5h, and cool it down to room temperature naturally. Take out the roasted positive electrode sheet, put the positive electrode sheet into a container filled with water according to the ratio of the mass of the positive electrode sheet to the volume of water of 1:50g / ml and stir for 15min with an electric stirrer at a stirring speed of 30r / min, The temperature of the water during stirring was 20°C. After the stirring was stopped, the contents in the container were sieved with a 10-mesh sieve, the aluminum foil on the s...

Embodiment 2

[0024] Example 2: According to the ratio (g / ml) of the mass of the positive electrode sheet to the volume ratio of the ceramic crucible of 1:10, the positive electrode sheet is loaded into the ceramic crucible and placed in a box-type resistance furnace, starting from room temperature at 7°C / min Raise the temperature of the furnace to 550°C at a certain rate of temperature rise, and then keep the furnace for 0.5 hours to cut off the power of the box-type resistance furnace and cool it down to room temperature naturally. Take out the roasted positive electrode sheet, put the positive electrode sheet into a container filled with water according to the ratio of the mass of the positive electrode sheet to the volume of water of 1:50g / ml and stir for 15min with an electric stirrer at a stirring speed of 30r / min, The temperature of the water during stirring was 20°C. After the stirring was stopped, the contents in the container were sieved with a 10-mesh sieve, the aluminum foil on ...

Embodiment 3

[0025] Example 3: According to the ratio (g / ml) of the mass of the positive electrode sheet to the volume ratio of the ceramic crucible of 1:10, the positive electrode sheet is loaded into the ceramic crucible and placed in a box-type resistance furnace, starting from room temperature at 5°C / min Raise the temperature of the furnace to 600°C at a certain heating rate, and then keep it warm for 0.5h, then cut off the power of the box-type resistance furnace, and cool it down to room temperature naturally. Take out the roasted positive electrode sheet, put the positive electrode sheet into a container filled with water according to the ratio of the mass of the positive electrode sheet to the volume of water of 1:60g / ml and stir for 15min with an electric stirrer at a stirring speed of 30r / min, The temperature of the water during stirring was 25°C. After the stirring was stopped, the contents in the container were sieved with a 10-mesh sieve, the aluminum foil on the sieve was was...

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Abstract

The invention relates to a method for separating lithium cobalt oxide and aluminum foil on a scrapped lithium ion battery positive pole piece. The method comprises the following steps: charging and dismantling a scrapped lithium ion battery, placing the waste positive pole piece into a box-type resistance furnace, roasting the waste positive pole piece in the box-type resistance furnace at the temperature of 500 to 600 DEG C, placing the roasted positive pole piece into a vessel with water, stirring the positive pole piece in the water by utilizing an electric stirrer, and screening substances in the vessel by utilizing a screen, wherein a substance on the screen is aluminum foil; washing the substance on the screen by utilizing the water, and naturally drying the substance to obtain the aluminum foil; filtering the substance below the screen (the substance below the screen is a mixed solution containing a positive active substance), placing the naturally dried filtered substance into a ceramic crucible, placing the ceramic crucible into the box-type resistance furnace to be processed at high temperature to obtain the lithium cobalt oxide. 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 lithium cobalt oxide and the aluminum foil is high, the cost is low, no organic solvent needs to be used in the processing step, 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 positive electrode sheet obtained after dismantling the scrapped lithium-ion battery generally needs to separate the active material lithium cobaltate on the positive electrode sheet from the aluminum foil as the base material before further processing. The first Chinese pa...

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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