Method for separating positive pole piece from active substance of lithium ion battery

A lithium-ion battery and positive pole piece technology, which is applied in battery recycling, solid waste removal, waste collector recycling, etc., can solve the problem of high energy consumption, achieve the effect of reducing the amount of separation and improving washing efficiency

Inactive Publication Date: 2019-03-01
山西根复科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this current method is that the solvent with a high boiling point is separated from the evaporation of the current collector and the powder.
Due to the high boiling point of the organic solvent used for extraction, the energy consumption is high during the drying process by heating

Method used

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  • Method for separating positive pole piece from active substance of lithium ion battery

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Embodiment 1

[0034] A method for separating the positive electrode sheet and the active material of a lithium ion battery. First, the positive electrode sheet material is sent into a tubular dissolver provided with an ultrasonic probe, and an organic solvent A is added for dissolution to obtain a first solution; wherein, The organic solvent A can be N-methyl-2-pyrrolidone; the solid-liquid ratio in the tubular dissolver=1g:0.5mL, the dissolution conditions of the tubular dissolver are: the temperature is 80°C; the dissolution time is 0.5 hours; filter the first solution with a filter press to obtain a current collector and a suspension, and filter the suspension to obtain a filtrate and a powder; filter the current collector and the powder with a low boiling point solvent The fractional washing was carried out three times respectively, and the low boiling point solvent was water. The washing liquid and solid matter are obtained, and the obtained solid matter is dried and collected, wherein...

Embodiment 2

[0036] A method for separating the positive electrode sheet and the active material of a lithium ion battery. First, the positive electrode sheet material is sent into a tubular dissolver provided with an ultrasonic probe, and an organic solvent A is added for dissolution to obtain a first solution; wherein, The organic solvent A can be dimethylformamide; the solid-liquid ratio in the tubular dissolver=1g:1.5)mL, and the dissolution conditions of the tubular dissolver are: the temperature is 50°C; the dissolution time is 2 hours ; The first solution is filtered with a filter press to obtain a current collector and a suspension, and the suspension is filtered to obtain a filtrate and a powder; the current collector and the powder are respectively treated with a low boiling point solvent The fractional washing was carried out three times, and the low boiling point solvent was ethanol. The washing liquid and solid matter are obtained, and the obtained solid matter is dried and co...

Embodiment 3

[0038] A method for separating the positive electrode sheet and the active material of a lithium ion battery. First, the positive electrode sheet material is sent into a tubular dissolver provided with an ultrasonic probe, and an organic solvent A is added for dissolution to obtain a first solution; wherein, The organic solvent A can be dimethylacetamide; the solid-liquid ratio in the tubular dissolver=1g:1mL, and the dissolution conditions of the tubular dissolver are: the temperature is 60° C.; the dissolution time is 1 hour; The first solution is filtered with a filter press to obtain a current collector and a suspension, and the suspension is filtered to obtain a filtrate and a powder; the current collector and the powder are respectively graded and washed with a low boiling point solvent Three times, the low boiling point solvent was diethyl ether. The washing liquid and solid matter are obtained, and the obtained solid matter is dried and collected, wherein, during three...

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Abstract

The invention provides a method for separating a positive pole piece from an active substance of a lithium ion battery. The method comprises the steps that a positive pole piece material is conveyed into a tubular dissolver, and an organic solvent A is added for dissolving so as to obtain a first solution; the first solution is filtered to obtain a current collector and a suspension; and the suspension is filtered to obtain filtrate and powder; and staged washing is carried out on the current collector and the powder separately by adopting a solvent B so as to obtain washing liquid and a solidsubstance. According to the method provided by the invention, the organic solvent A is firstly introduced to realize soaking extraction of the positive pole piece material, then the solvent B is introduced for staged washing, so that the technical problem that in the prior art, the energy consumption is high in the drying process of a separated pole piece mixture due to the fact that the boilingpoint of an extraction solvent is too high can be effectively solved, in addition, by means of staged washing and recycling of the solvent, the washing efficiency is improved, the separation amount ofa low-boiling-point solvent and a high-boiling-point solvent is decreased, and the effects of energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention relates to the technical field of reprocessing of waste lithium-ion batteries, in particular to a method for separating positive pole pieces and active materials of lithium-ion batteries. Background technique [0002] In the lithium-ion battery recycling process, the battery pole piece is coated on the surface of the current collector by forming a slurry of active material and conductive agent through a binder. In the recovery process, in order to recover the active material and the current collector, it is necessary to introduce a solvent to separate the active material from the current collector. Commonly used methods include pyrolysis and solvent dissolution. The pyrolysis method is to pyrolyze the binder by introducing high temperature, reduce the binding effect of the binder, and separate the active material from the current collector. In this method, in a high temperature environment, the binder will decompose and produce toxic an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54B09B3/00
CPCB09B3/00H01M10/54Y02W30/84
Inventor 张俊喜刘蔚王昆仑
Owner 山西根复科技有限公司
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