Method and equipment for recovering lithium battery slurry

A recycling method and technology for lithium batteries, applied in battery recycling, recycling technology, separation methods, etc., can solve problems such as unfavorable industrial application, poor centrifugal effect, easy introduction of impurities, etc. The effect of NMP purity
CN113648670AActive Publication Date: 2021-11-16GUANGDONG BRUNP RECYCLING TECH +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG BRUNP RECYCLING TECH
Publication Date
2021-11-16

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Abstract

The invention discloses a method for recycling lithium battery slurry, which comprises the following steps of: pretreating the lithium battery slurry, performing centrifugal spray drying on the pretreated lithium battery slurry, and separating a solid phase from a solvent. According to the method, a positive electrode material and NMP can be completely and efficiently separated by adopting centrifugal spraying, impurity elements are not introduced in the process, the purity of the NMP is improved, the treatment cost is low, meanwhile, the pollution to the environment is reduced, and the method has a very good industrial application prospect. The invention also discloses equipment for recycling the lithium battery slurry, which is a centrifugal spray drying system and comprises a spray chamber, a cyclone separator, a condenser, a condensate storage tank and a rectifying tower. The system improves original centrifugal spray drying equipment, and is designed by combining centrifugal spray drying with NMP condensation recovery processes, so that NMP can be directly recovered after the positive electrode material and NMP are separated, the treatment efficiency is high, and continuous production can be realized.
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Description

technical field

[0001] The invention belongs to the technical field of battery material recycling, and in particular relates to a method for recycling waste lithium battery slurry containing NMP and equipment for recycling it. Background technique

[0002] The production process of lithium batteries is divided into three major sections, one is pole piece production, the other is cell production, and the third is battery assembly. Among them, in the first stage of the process, since the positive electrode material needs to be bonded by PVDF to bond with the aluminum foil to form a pole piece, but PVDF is a solid powder, it is necessary to dissolve PVDF with NMP and stir it evenly with the positive electrode material to form a stable electrode sheet. However, due to the failure of the slurry due to changes in the environment, foreign matter, and viscosity during the slurrying and coating process, the slurry cannot be coated normally. Since the slurry contains a large amount o...

Claims

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