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Lithium cobalt oxide positive plate recovery method

A recycling method and cathode sheet technology, applied in the field of lithium cobalt oxide cathode sheet recycling, can solve the problems of large pollution, high cost, low efficiency, etc., and achieve the effect of good wettability

Active Publication Date: 2021-11-05
贵州中伟资源循环产业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a recovery method for lithium cobalt oxide positive electrode, aiming to solve the problems of large pollution, high cost and low efficiency in the prior art

Method used

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  • Lithium cobalt oxide positive plate recovery method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Place 10Kg of lithium cobaltate positive electrode sheet (containing 47% cobalt, 5.6% lithium) in a crusher and crush it into 20mm, place the crushed material in an NMP solution container with a liquid-solid ratio of 5ml: 1g, and then place the solution in Soak at a low temperature of 50°C for 30 minutes, then soak at a high temperature of 85°C for 1 hour, start stirring during high temperature soaking at a speed of 600r / min, and peel off again with an ultrasonic oscillator after soaking. Put the soaking mixture in the container into a primary sieve with a pore size of 10mm for a primary filtration, filter out the positive aluminum sheet and the first filtrate, dry the positive aluminum sheet and weigh it, weighing 1.77Kg. The first filtrate continues to be filtered through a secondary screen with a pore size of 3mm, and the second filtrate and positive lithium cobaltate powder are filtered out; In the sulfuric acid + hydrogen peroxide system, the liquid-solid ratio is ...

Embodiment 2

[0058] Place 10Kg of lithium cobalt oxide positive electrode sheet (containing 47% cobalt, 5.6% lithium) in a crusher and crush it into 35mm, place the crushed material in an NMP solution container with a liquid-solid ratio of 10ml: 1g, and then put the solution in Soak at a low temperature of 45°C for 1 hour, then soak at a high temperature of 75°C for 1.5 hours, start stirring during high temperature soaking at a speed of 800r / min, and peel off again with an ultrasonic oscillator after soaking. Put the soaking mixture in the container into a primary sieve with a pore size of 15 mm for a primary filtration, filter out the positive aluminum sheet and the first filtrate, dry the positive aluminum sheet and weigh it, weighing 1.79Kg. The first filtrate continues to be filtered through a secondary screen with a pore size of 5 mm, and the second filtrate and positive electrode lithium cobaltate powder are filtered out. After washing the positive electrode lithium cobaltate powder ...

Embodiment 3

[0061] Place 10Kg of lithium cobaltate positive electrode sheet (containing 47% cobalt, 5.6% lithium) in a crusher and crush it into 25mm, place the crushed material in an NMP solution container with a liquid-solid ratio of 8ml: 1g, and then put the solution in Soak at a low temperature of 35°C for 0.8h, then soak at a high temperature of 90°C for 2.0h, start stirring during high temperature soaking at a speed of 700r / min, and peel off again with an ultrasonic oscillator after soaking. Put the soaking mixture in the container into a primary sieve with a pore size of 12mm to filter once, filter out the positive aluminum flake and the first filtrate, dry the positive aluminum flake and weigh it, weighing 1.8Kg. The first filtrate continues to be filtered through a secondary screen with a pore size of 3 mm, and the second filtrate and positive electrode lithium cobaltate powder are filtered out. After washing the positive electrode lithium cobaltate powder with water, in the sulf...

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Abstract

The invention provides a lithium cobalt oxide positive plate recovery method. According to the lithium cobalt oxide positive plate recovery method, in the organic solvent soaking process, soaking is conducted at a first temperature and a second temperature, the first temperature is lower than the second temperature, it can be guaranteed that all lithium cobalt oxide powder makes full contact with an organic solvent through low-temperature standing soaking, wettability is good; then high-temperature soaking is carried out with stirring to dissolve a binder, low-temperature soaking is carried out firstly, and then high-temperature soaking and stirring are carried out, so that the problems that pole pieces are stirred into a ball, the interiors of the pole pieces are in poor contact with the organic solvent, and only external lithium cobalt oxide is in contact with the organic solvent and plays a role in dissolving the binder due to the centrifugal force during high-temperature stirring all the time can be prevented; the lithium cobalt oxide powder and an aluminum foil are not completely separated.

Description

technical field [0001] The present application relates to the technical field of hydrometallurgy recovery, in particular to a method for recovering lithium cobaltate positive electrode pieces. Background technique [0002] Due to its stable battery structure, high specific capacity, and outstanding comprehensive performance, lithium cobalt oxide batteries are mainly used in small and medium-sized batteries, and are widely used in electronic products such as notebook computers and mobile phones. The content of cobalt and lithium in the positive plate of lithium cobalt oxide battery is relatively high, and cobalt and lithium are relatively scarce strategic metals, and the value and significance of their recovery are becoming more and more important. However, the manufacturing process of the lithium cobalt oxide positive electrode sheet makes it very dense, making it difficult for the conventional battery crushing and sorting method to allow the lithium cobalt oxide powder to f...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B3/08C22B3/16C22B3/22C22B26/12H01M10/052H01M10/54
CPCC22B7/006C22B7/007C22B23/0453C22B23/043C22B26/12C22B3/16C22B3/22C22B3/08H01M10/052H01M10/54Y02W30/84Y02E60/10Y02P10/20
Inventor 张勤俭肖超李攀訚硕梁佳乐黄洪
Owner 贵州中伟资源循环产业发展有限公司