Recycling method of positive plates for lithium ion batteries

A technology of lithium ion battery and positive electrode sheet is applied in the field of recycling and utilization of lithium ion battery, which can solve the problem of low removal efficiency of positive electrode material, and achieve the effect of efficient recycling and high removal efficiency.

Inactive Publication Date: 2018-08-31
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for recycling the positive electrode sheet of lithium-ion batteries, thereby solving the problem of low removal efficiency of the positive electrode material existing in the existing method

Method used

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  • Recycling method of positive plates for lithium ion batteries

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Comparison scheme
Effect test

Embodiment 1

[0023] The recycling method of the lithium-ion battery positive plate of the present embodiment adopts the following steps:

[0024] 1) Cut the scrapped positive electrode sheets on the production line into small pieces with a diameter of 1 cm, and then heat-treat them at 300°C for 3 hours, and then put them into a vibrating sieve with a mesh diameter of 1 mm. Pre-separation of fluid, the undersize is ternary material powder, and the oversize is pre-separated pole pieces;

[0025] 2) Place the pre-separated pole piece in an ultrasonic stirring device, then add NMP solvent, and process the pre-separated pole piece under stirring and ultrasonic assistance. The stirring speed is 100r / min, the frequency of ultrasonic treatment is 30KHz, and the time is 2h, carry out coarse filtration to the treated mixed solution, and separate the aluminum foil and the positive electrode material slurry;

[0026] 3) Dry the cathode material slurry in an oven at 110° C. to recover the ternary mate...

Embodiment 2

[0028] The recycling method of the lithium-ion battery positive plate of the present embodiment adopts the following steps:

[0029] 1) Cut the positive electrode sheet obtained after dismantling the lithium-ion battery into small pieces with a diameter of 1cm, and then heat-treat it at 250°C for 4h, and then put it into a vibrating sieve with a mesh diameter of 1mm. Pre-separation of materials and current collectors, the undersize is ternary material powder, and the oversize is pre-separated pole pieces;

[0030] 2) Place the pre-separated pole piece in an ultrasonic stirring device, then add NMP solvent, and process the pre-separated pole piece under stirring and ultrasonic assistance. The stirring speed is 120r / min, the frequency of ultrasonic treatment is 30KHz, and the time is 3h, coarsely filter the treated mixed solution, and separate the aluminum foil and positive electrode material slurry;

[0031] 3) Dry the cathode material slurry in an oven at 100°C to recover the...

Embodiment 3

[0033] The recycling method of the lithium-ion battery positive plate of the present embodiment adopts the following steps:

[0034] 1) Cut the positive electrode sheet obtained after dismantling the lithium-ion battery into small pieces with a diameter of 1cm, and then heat-treat it at 400°C for 2h, then put it into a vibrating sieve with a mesh diameter of 1mm, and vibrate and sieve to achieve ternary Pre-separation of materials and current collectors, the undersize is ternary material powder, and the oversize is pre-separated pole pieces;

[0035] 2) Place the pre-separated pole piece in an ultrasonic stirring device, then add acetone, and process the pre-separated pole piece under stirring and ultrasonic assistance. The stirring speed is 150r / min, the frequency of ultrasonic treatment is 25KHz, and the time is 4h , coarsely filtering the treated mixed solution to separate the aluminum foil and positive electrode material slurry;

[0036] 3) Dry the cathode material slurry...

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Abstract

The invention relates to a recycling method of positive plates for lithium ion batteries. The method comprises the following steps: heating the waste positive plates at the temperature of 250 to 400 DEG C, then carrying out vibration screening, and separating to obtain a positive material and pre-separated pole plates; soaking the pre-separated pole plates inside an organic solvent, and separatinga positive current collector and a positive material size. According to the recycling method of positive plates for lithium ion batteries provided by the invention, the waste positive plates are firstly heated, and then pre-removal of the positive material is realized by using vibration screening, so that about 80% of the positive material can be removed; and according to the method, the removalefficiency for the positive material is high, and efficient recycling for the positive material can be realized.

Description

technical field [0001] The invention belongs to the field of recycling of lithium-ion batteries, and in particular relates to a method for recycling positive plates of lithium-ion batteries. Background technique [0002] Lithium-ion battery is a new type of chemical power supply, which meets the requirements of the development of modern electronic products. It has the characteristics of high energy density, high voltage, no pollution, green environmental protection, high cycle life, no memory effect, and fast charging speed. Currently It has been widely used in electronic equipment such as personal computers, mobile phones and portable appliances. [0003] In the production process of lithium-ion batteries, a large number of positive electrode remnants and scrapped positive electrodes will be produced, and a large number of discarded batteries will also be produced in daily life. If these scrap positive electrodes are not recycled and discarded directly, it will not only pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 朱林剑李云峰赵永锋许飞马红涛尼亚琼赵红娟刘兴丹谭倩李明
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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