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Method for separating and recycling positive and negative electrode mixed powder of waste ternary lithium ion battery

A lithium-ion battery and mixed powder technology, which is applied in battery recycling, waste collector recycling, solid separation and other directions, can solve problems such as unfavorable large-scale industrial operation, small positive and negative mixed powder particles, large consumption of leaching acid, Alkali preparation and other problems can reduce production dust and waste water, reduce the amount of chemicals added, and reduce material costs.

Pending Publication Date: 2022-02-01
SHENZHEN QINGYAN EQUIP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mixed powder has a large quality and a large volume. In order to meet the requirements of the subsequent wet treatment process such as solid-to-liquid ratio, the reactor is bulky and requires a large amount of leaching acid and alkali preparation, resulting in a large amount of subsequent industrial wastewater treatment and production costs. High, not conducive to large-scale industrial operation
Moreover, the positive and negative mixed powder particles are small, and the sorting operation is dusty and difficult. At present, there are few relevant reports on the efficient separation method of mixed powder.

Method used

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  • Method for separating and recycling positive and negative electrode mixed powder of waste ternary lithium ion battery
  • Method for separating and recycling positive and negative electrode mixed powder of waste ternary lithium ion battery
  • Method for separating and recycling positive and negative electrode mixed powder of waste ternary lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] S1 First, the positive and negative mixed powder of waste ternary lithium batteries containing Ni, Co, and Mn is treated with a pulverizer and then sieved, and the powder with an oversized particle size on the sieve is returned to the pulverizer for further processing, and the granules are obtained under the sieve Positive and negative electrode mixed powder with a diameter ranging from 200 mesh to 300 mesh.

[0057] S2 disperses the positive and negative electrode mixed powder between 200 mesh and 300 mesh under the sieve of step S1 in water under the mechanical stirring condition of 1000r / min at a speed of 1000r / min, the stirring time is 20min, and the pH of the slurry is controlled to be 8 to obtain a solid content of 10% Slurry I.

[0058] S3 Under the conditions of a stirring speed of 500r / min and a magnetic field strength of 0.1T, the flocculant ammonium polyacrylate with a mass concentration of 0.1% prepared within a week was added to the slurry I for bridging fl...

Embodiment 2

[0066] S1 First, the positive and negative mixed powder of waste ternary lithium batteries containing Ni, Co, Mn, and Fe is treated with a pulverizer and then sieved, and the powder with too large particle size on the sieve is returned to the pulverizer to continue processing, The positive and negative electrode mixed powder with a particle size ranging from 300 mesh to 400 mesh is obtained.

[0067] S2 Disperse the positive and negative electrode mixed powder between 300 mesh and 400 mesh under the sieve of step S1 in water under the condition of mechanical stirring at 1300r / min, stirring for 30min, and controlling the pH of the slurry to 11 to obtain the solid content 20% slurry I.

[0068] S3 Under the conditions of a stirring speed of 700r / min and a magnetic field strength of 0.5T, a flocculant non-ionic polyacrylamide with a mass concentration of 0.2% prepared within a week was added to the slurry I for bridging flocculation. The non-ionic polyacrylamide solution account...

Embodiment 3

[0076] S1 First, the positive and negative mixed powder of waste ternary lithium batteries containing Ni, Co, and Mn is treated with a pulverizer and then sieved, and the powder with an oversized particle size on the sieve is returned to the pulverizer for further processing, and the granules are obtained under the sieve Positive and negative electrode mixed powder with a diameter ranging from 100 mesh to 200 mesh.

[0077] S2 Disperse the positive and negative electrode mixed powder between 100 mesh and 200 mesh under the sieve in step S1 in water under the condition of mechanical stirring at 1100r / min, stirring for 15min, and controlling the pH of the slurry to 9 to obtain the solid content 15% slurry I.

[0078] S3 Under the conditions of a stirring speed of 800r / min and a magnetic field strength of 0.3T, a flocculant non-ionic polyacrylamide with a mass concentration of 0.1% prepared within a week was added to the slurry I to carry out bridging flocculation. The non-ionic...

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Abstract

The invention provides a method for separating and recycling positive and negative electrode mixed powder of a waste ternary lithium ion battery. The method comprises the following steps of: screening the positive and negative electrode mixed powder of the waste ternary lithium ion battery, and stirring and dispersing to obtain slurry I; adding a flocculating agent into the slurry I, carrying out bridging flocculation under the condition of a low-intensity magnetic field to obtain slurry II containing a large amount of floccules, and then adding magnetic seeds for further magnetization to obtain floc slurry III containing a large amount of magnetic floccules containing the magnetic seeds; treating the slurry III by using high-intensity magnetic separation equipment to separate out a non-magnetic material and a magnetic material; and filtering and pyrolyzing the non-magnetic material at high temperature to obtain recycled negative electrode graphite powder; and subjecting the magnetic material to ultrasonic treatment and then treating it by using low-intensity magnetic separation equipment to obtain a strong magnetic material and a low-intensity magnetic material which can be recycled as magnetic seeds, and filtering and pyrolyzing the low-intensity magnetic material at high temperature to obtain recycled high-purity positive electrode material powder. The method has the advantages of simple process, low wastewater and dust emission, small agent addition amount, recyclable magnetic seeds and high recovery quality.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium ion batteries, and in particular relates to a method for separating and recycling positive and negative mixed powder of waste ternary lithium ion batteries. Background technique [0002] With the increasing shortage of fossil resources and the urgent need for environmental protection, it has become a broad consensus to develop electric vehicles to reduce resource consumption and environmental pollution. Since 2014, under the guidance of relevant policies in our country, the compound annual growth rate of production and sales of new energy vehicles has been more than 50%. As of June 2019, the number of new energy vehicles in the country has reached 3.44 million, but only accounts for The development prospect of the new energy vehicle market is still broad. According to the calculation of the average service life of power batteries of 5-8 years, my country has gradually entered the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54B09B3/40B09B5/00B03C1/30B09B101/16
CPCH01M10/54B09B3/00B09B5/00B03C1/30Y02W30/84
Inventor 傅婷婷田勇叶利强陈建军闵杰符冬菊张维丽
Owner SHENZHEN QINGYAN EQUIP TECH CO LTD
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