Separation method for cathode and anode plates in recovery process of lithium ion batteries

A technology for lithium-ion batteries and positive and negative electrodes, applied in the field of lithium-ion battery recycling, can solve the problems of waste of resources, waste, and low efficiency of the separation method of positive and negative electrodes, and achieve improved recovery rate, recovery purity, and low recycling costs Effect

Inactive Publication Date: 2017-12-19
CHINA AVIATION LITHIUM BATTERY LUOYANG
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Problems solved by technology

[0002] With the country's vigorous promotion of electric vehicles, a large number of power lithium batteries will be scrapped in the future, and according to the prediction of China Automotive Technology Research Center, the recovery rate of waste batteries in my country will be less than 2% in the future
Waste lithium-ion batteries contain reusable resources, such as valuable metals such as aluminum and copper, graphite, and positive electrode materials, as well as a large amount of electrolyte solution; if these waste lithium batteries are not handled properly, it will cause a great waste of resources. and severe environmental pollution
[0003] In the prior art, the main valuable recycled materials for lithium-ion batteries are copper, aluminum, positive electrode powder and negative electrode powder, and more than 90% of the valuable recycled materials are on the positive and negative electrodes of lithium-ion batteries. The positive electrode sheet is aluminum foil coated with positive electrode material, and the negative electrode sheet of lithium ion battery is copper foil coated with negative electrode material; how t

Method used

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  • Separation method for cathode and anode plates in recovery process of lithium ion batteries

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Experimental program
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Effect test

Embodiment 1

[0021] The method for separating the positive and negative plates in the lithium ion battery recycling process of the present embodiment may further comprise the steps:

[0022] 1) Discharge the lithium iron phosphate lithium-ion battery, discharge the electrolyte, then disassemble, remove the shell, cover plate and the pole on the cover plate, and then break the battery cell to obtain fragments with a size of about 5mm;

[0023] 2) Sorting: After the fragments obtained in step 1) are removed by negative pressure air separation to obtain the mixed fragments of positive electrode fragments and negative electrode fragments;

[0024] 3) The mixed fragments are transported to the magnetic roller of the magnetic separator through the conveyor belt, and the magnetic field with a magnetic induction intensity of 9500Gs is used to magnetically separate the mixed pole pieces to separate the magnetic positive pole fragments from the non-magnetic negative pole fragments.

[0025] Using th...

Embodiment 2

[0027] The method for separating the positive and negative plates in the lithium ion battery recycling process of the present embodiment may further comprise the steps:

[0028] 1) Discharge the lithium cobalt oxide lithium-ion battery, discharge the electrolyte, then disassemble, remove the shell, cover plate and the pole on the cover plate, and then crush the battery cell to obtain fragments with a size of about 40mm;

[0029] 2) Sorting: After the fragments obtained in step 1) are removed by negative pressure air separation to obtain the mixed fragments of positive electrode fragments and negative electrode fragments;

[0030] 3) The mixed fragments are transported to the magnetic roller of the magnetic separator through the conveyor belt, and the magnetic field with a magnetic induction intensity of 10000Gs is used to magnetically separate the mixed fragments, and the magnetic positive pole fragments are selected to obtain the remaining mixed fragments;

[0031] 4) The rem...

Embodiment 3

[0036] The method for separating the positive and negative plates in the lithium ion battery recycling process of the present embodiment may further comprise the steps:

[0037] 1) Discharge the aluminum-shell nickel-cobalt lithium-manganese oxide lithium-ion battery, discharge the electrolyte, and then break it as a whole to obtain fragments with a size of about 70mm;

[0038] 2) Sorting: the fragments obtained in step 1) are firstly removed by a negative pressure winnowing machine to remove the diaphragm, and then the lithium-ion battery casing is removed by an eddy current separator to obtain mixed fragments of positive electrode fragments and negative electrode fragments;

[0039] The steps of eddy current separator to remove the lithium-ion battery case are as follows: the debris mixture after removing the diaphragm is passed through the eddy current separator with a field strength of 5400Gs and a magnetic roller width of 500mm at a feeding speed of 3kg / min; Rotate clockw...

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Abstract

The invention relates to a separation method for cathode and anode plates in a recovery process of lithium ion batteries and belongs to the technical field of recovery of lithium ion batteries. The separation method includes the steps of: performing magnetic separation to mixed chips, which are composed of cathode chips and anode chips and are formed during the recovery process of lithium ion batteries, in a magnetic field, of which the magnetic inductive intensity is higher than 9000 Gs, thus separating the cathode chips out, wherein a cathode material of the cathode chips includes at least one of cobalt, manganese, iron and nickel. The separation method is simple and high-effective, is low in recovery cost and is free of generation of pollutants. Through the separation method, the separation rate of the cathode chips can reach more than 95% through one-stage magnetic separation and can reach more than 98% through more than two stages of magnetic separation. The method can significantly increase the recovery rate and recovery purity of cathode and anode powders and copper and aluminum granules in subsequent steps.

Description

technical field [0001] The invention relates to a method for separating positive and negative plates in the recovery process of lithium ion batteries, and belongs to the technical field of lithium ion battery recovery. Background technique [0002] With the country's vigorous promotion of electric vehicles, a large number of power lithium batteries will be scrapped in the future. According to the prediction of China Automotive Technology Research Center, the recovery rate of waste batteries in my country will be less than 2% in the future. Waste lithium-ion batteries contain reusable resources, such as valuable metals such as aluminum and copper, graphite, and positive electrode materials, as well as a large amount of electrolyte solution; if these waste lithium batteries are not handled properly, it will cause a great waste of resources. and serious environmental pollution. [0003] In the prior art, the main valuable recycled materials for lithium-ion batteries are copper...

Claims

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Application Information

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IPC IPC(8): H01M10/54B03C1/00
CPCY02W30/84H01M10/54B03C1/002
Inventor 齐彬伟王楠李新旺
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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