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Method for pretreating to-be-recycled ternary positive plate

A cathode sheet and pretreatment technology, applied in the field of lithium ion batteries, can solve the problems of large pollution, high energy consumption and cost, poor separation effect, etc., achieve high separation rate, small equipment investment, and improve slag-liquid filtration and separation performance Effect

Active Publication Date: 2022-01-28
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

[0008] The purpose of the present invention is to overcome the defects of high energy consumption and cost, high pollution and poor separation effect in the existing recovery method

Method used

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  • Method for pretreating to-be-recycled ternary positive plate
  • Method for pretreating to-be-recycled ternary positive plate
  • Method for pretreating to-be-recycled ternary positive plate

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Effect test

Embodiment 1

[0069] According to the method described below, the ternary positive electrode sheet to be recovered is pretreated, and the method comprises the following steps:

[0070] (1) First, the ternary positive electrode sheet to be recovered is broken into a block with a width of 5 cm;

[0071] Weigh 92.65g block-shaped positive electrode sheet, add it to 1L sulfuric acid solution with a concentration of 0.7mol / L, and soak at 25°C for 30min;

[0072] In the above system, the compressed air is introduced into the air flow stirring treatment, the position of the air flow is 3 / 4 of the liquid level of the system, the time is 5min, and the flow rate of the compressed air is 1L / min;

[0073] (2) Pass the product in step (1) through a primary sieve and a secondary sieve successively, the aperture of the primary sieve is 1cm, and the aperture of the secondary sieve is 2mm; The object is a large piece of aluminum foil;

[0074] Drying the first-stage sieve and then passing through the seco...

Embodiment 2

[0081] According to the method described below, the ternary positive electrode sheet to be recovered is pretreated, and the method comprises the following steps:

[0082] (1) First, the ternary positive electrode sheet to be recovered is broken into a block with a width of 5 cm;

[0083] Weigh 120.16g block-shaped positive electrode sheet, add it to 2L sulfuric acid solution with a concentration of 0.5mol / L, and soak it at 25°C for 40min;

[0084] In the above system, the compressed air is introduced into the air flow stirring process, the position of the air flow is 2 / 3 of the liquid level of the system, the time is 8min, and the flow rate of the compressed air is 2L / min;

[0085] (2) the product in step (1) is passed through a primary sieve and a secondary sieve successively, the aperture of the primary sieve is 0.5cm, and the aperture of the secondary sieve is 0.5mm; The sieve is a large piece of aluminum foil;

[0086] Drying the first-stage sieve and then passing throug...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a method for pretreating a to-be-recycled ternary positive plate. The method comprises the following steps: (1) carrying out first acid leaching treatment on the to-be-recycled ternary positive plate and an acid solution to obtain an intermediate I, and carrying out airflow stirring treatment on the intermediate I to obtain a mixture I; (2) sieving the mixture I to obtain aluminum foil and an intermediate II; (3) sequentially carrying out alkaline leaching treatment and separation on the intermediate II and an alkaline solution to obtain a solid material serving as a mixture II; and (4) in the presence of a reducing substance, carrying out second acid leaching treatment on the mixture II to obtain the positive electrode material. According to the method provided by the invention, the separation rate of separating the positive electrode active material and the aluminum foil current collector is high, the aluminum foil can be completely recycled, the energy consumption is low, the pollution is small, and meanwhile, the method has very high leaching rate of valuable metals and slag liquid filtering and separating performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for pretreating a ternary positive electrode sheet to be recovered. Background technique [0002] Lithium-ion batteries are widely used in new energy vehicles, 3C products and energy storage batteries because of their advantages such as high energy density, good safety performance, long service life and low pollution. [0003] With the vigorous development of my country's new energy vehicle industry, the recycling of decommissioned batteries is gradually on the agenda. In 2025, about 93Gwh of power batteries are expected to be decommissioned in my country, of which retired ternary power batteries will be the mainstream after 2023. The recycling of waste ternary lithium batteries is of great significance for alleviating the plight of my country's scarce strategic metals such as cobalt and nickel being controlled by others, as well as providing resources such as nickel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B21/00C22B23/00C22B47/00H01M10/54
CPCC22B7/007C22B21/0023C22B23/043C22B47/00H01M10/54H01M2004/028Y02E60/10Y02P10/20Y02W30/84
Inventor 张勤俭肖超李攀赵思佳邓海龙罗进爱
Owner 贵州中伟资源循环产业发展有限公司
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