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Method for recycling lithium ion battery negative electrode slurry

A technology for lithium-ion batteries and negative electrode slurry, which is applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problems of high energy consumption, single recycling method, and inactivation of binders, and achieves energy reduction. Consumption, simplified recycling process, easy to operate effect

Pending Publication Date: 2022-06-03
荆门亿纬创能锂电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, a variety of methods are used to recycle waste batteries or pole pieces, but the recycling method for negative electrode slurry is relatively simple; at the same time, the high-temperature baking method is used in the prior art to deactivate the binder. Therefore, the method of separating the negative electrode powder from the pole piece has a long overall baking time, many steps, and high energy consumption, which is not conducive to efficient and energy-saving recovery of the negative electrode slurry

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  • Method for recycling lithium ion battery negative electrode slurry
  • Method for recycling lithium ion battery negative electrode slurry
  • Method for recycling lithium ion battery negative electrode slurry

Examples

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Effect test

Embodiment 1

[0078] This embodiment provides a method for recycling negative electrode slurry of a lithium ion battery, see figure 1 , the method includes:

[0079] (1) Add 0.5kg of NMP to 5kg of the negative electrode slurry to be recovered, place it in a stirring tank and stir, the stirring revolution speed is 15rpm, the dispersing speed is 900rpm, the time is 2h, and the discharge temperature is 23 ℃ to obtain a mixed slurry material;

[0080] (2) transferring the mixed slurry described in step (1) to a centrifuge for centrifugation, the centrifugal speed is 10000rpm, and the time is 1h to obtain the upper layer liquid and the lower layer slurry;

[0081] (3) distilling the upper layer liquid described in step (2) to obtain a high-purity NMP solvent, heating the lower layer slurry at 550 ° C for 30min, the heating method is high temperature baking, then passing through a 200-mesh sieve, collecting and passing through the sieve The particles of the net are obtained to obtain a regenera...

Embodiment 2

[0084] This embodiment provides a method for recycling negative electrode slurry of a lithium ion battery, see figure 1 , the method includes:

[0085] (1) Add 0.7kg of NMP to 5kg of the negative electrode slurry to be recovered, place it in a stirring tank and stir, the stirring revolution speed is 10rpm, the dispersing speed is 800rpm, the time is 2.5h, and the discharge temperature is 20 ° C to obtain the mixing slurry;

[0086] (2) transferring the mixed slurry described in step (1) to a centrifuge for centrifugation, the centrifugal speed is 9000rpm, and the time is 1.5h to obtain the upper layer liquid and the lower layer slurry;

[0087] (3) distilling the upper layer liquid described in step (2) to obtain a high-purity NMP solvent, heating the lower layer slurry at 600 ° C for 25min, the heating method is high-temperature baking, then passing through a 200-mesh sieve, collecting and passing through the sieve The particles of the net are obtained to obtain a regenerat...

Embodiment 3

[0090] This embodiment provides a method for recycling negative electrode slurry of a lithium ion battery, see figure 1 , the method includes:

[0091] (1) Add 0.3kg of NMP to 5kg of the negative electrode slurry to be recovered, place it in a stirring tank and stir, the stirring revolution speed is 20rpm, the dispersing speed is 1000rpm, the time is 1.5h, and the discharge temperature is 26 ℃ to obtain the mixing slurry;

[0092] (2) transferring the mixed slurry described in step (1) to a centrifuge for centrifugation, and the rotating speed of the centrifugation is 11000rpm and the time is 0.5h to obtain the upper layer liquid and the lower layer slurry;

[0093] (3) distilling the upper layer liquid described in step (2) to obtain a high-purity NMP solvent, heating the lower layer slurry at 500 ° C for 35min, the heating method is high temperature baking, then passing through a 200-mesh sieve, collecting and passing through the sieve The particles of the net are obtained...

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Abstract

The invention provides a lithium ion battery negative electrode slurry recycling method, which comprises: (1) adding a first solvent to a to-be-recycled negative electrode slurry, and stirring to obtain a mixed slurry; (2) carrying out solid-liquid separation on the mixed slurry obtained in the step (1) to obtain upper-layer liquid and lower-layer slurry; and (3) distilling the upper-layer liquid obtained in the step (2) to obtain a second solvent, heating the lower-layer slurry to obtain a regenerated negative electrode material, and recovering the second solvent and the regenerated negative electrode material for preparing the negative electrode of the lithium ion battery. According to the method, the solvent is added into the to-be-recycled negative electrode slurry, stirring is performed, a molecular chain of a binder in the to-be-recycled negative electrode slurry is destroyed, the viscosity of the slurry is reduced, solid-liquid separation and heating are performed, the solvent and a negative electrode material in the slurry are synchronously recycled, impurity removal and long-time high-temperature baking are not needed, the recycling process is simplified, and the recycling efficiency is improved. Both the solvent and the negative electrode material can be recycled, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of lithium battery recycling, in particular to a method for recycling negative electrode slurry of a lithium ion battery. Background technique [0002] In recent years, the rapid development of the new energy industry has promoted the research and development of lithium-ion batteries, and lithium-ion batteries have been widely used in mobile phones, digital cameras, electric vehicles and other fields; however, the extensive use of lithium-ion batteries makes their recycling There are also many problems. At present, the recycling of lithium-ion battery anode materials is mostly concentrated in waste lithium batteries and scrapped pole pieces. [0003] CN106129522 discloses a preparation method for recycling graphite by utilizing the negative electrode of lithium ion battery. The pulverized waste negative electrode pole piece is put into an atmosphere furnace for heating treatment, and then ball-milled. After the ball-m...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 赵栓柱龚林马雅洁代强刘建华
Owner 荆门亿纬创能锂电池有限公司
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