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Recovery method of retired lithium ion battery positive electrode binder

A lithium-ion battery and recovery method technology, which is applied in the field of recovery and regeneration of key materials of lithium-ion batteries, can solve problems such as poor dissolution effect, low recovery efficiency of adhesives, and large consumption of ethanol washing, achieving high recovery efficiency and low investment , to achieve the effect of reasonable utilization

Inactive Publication Date: 2020-09-25
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of whether it is in an oxygen-free or anaerobic environment, the generated gas contains fluorine, which needs to be properly disposed of before being discharged into the atmosphere; (2) soaking in organic solvents makes the adhesive invalid, so as to separate the aluminum current collector from the The purpose of the positive electrode material, but the binder still exists in the positive electrode material, which affects the deep processing of the positive electrode material; (3) Use NMP to dissolve the binder PVDF in the electrode material, and use ethanol to wash and separate and recover PVDF
Although this method can realize the recovery of PVDF, the dissolution effect of using a single NMP for the invalid PVDF is very poor, the recovery efficiency of the adhesive is low, and the consumption of ethanol washing is large, and it is not easy to operate on a large scale

Method used

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  • Recovery method of retired lithium ion battery positive electrode binder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The mixed solvent of DMF and acetonitrile and the positive electrode powder are weighed according to the mass ratio of 10:1, and the positive electrode powder is poured into the organic mixed solvent, and ultrasonically, so that the positive electrode powder is completely immersed in the organic mixed solvent to prepare a suspension. Place the suspension in the reaction kettle, keep the pressure of the reaction kettle at -0.1MPa, and use mechanical stirring to stir the suspension at the same time, the stirring rate is 400r / min, the time is 5h, and the heating temperature is 60 °C, so that the adhesive Fully dissolved. Then, add DMF to the reactor at a volume ratio of 5:1, dilute it and place it in a centrifuge, the centrifugation rate is 12000rmp / min, the centrifugation time is 5min / time, and the number of centrifugation is 7 times to separate Cathode powder and organic solution containing PVDF. Put the organic solution containing PVDF into the vacuum rotary evaporator...

Embodiment 2

[0026] The mixed solvent of DMF and acetonitrile and the positive electrode powder were weighed according to the mass ratio of 30:1, and the positive electrode powder was poured into the organic mixed solvent, and ultrasonically, so that the positive electrode powder was completely immersed in the organic mixed solvent to prepare a suspension. Place the suspension in the reaction kettle, keep the pressure of the reaction kettle at -0.1MPa, and use mechanical stirring to stir the suspension at the same time. The agent is fully dissolved. Then, add DMF to the reaction kettle according to the volume ratio of 2:1, dilute it and place it in a centrifuge. Cathode powder and organic solution containing PVDF. Put the organic solution containing PVDF into the vacuum rotary evaporator, keep the vacuum degree at 500pa and the heating temperature at 40℃, and separate the organic mixed solvent and PVDF.

Embodiment 3

[0028] The mixed solvent of NMP and acetonitrile and the positive electrode powder were weighed according to the mass ratio of 2:1, and the positive electrode powder was poured into the organic mixed solvent, and ultrasonically, so that the positive electrode powder was completely immersed in the organic mixed solvent to prepare a suspension. Place the suspension in the reaction kettle, keep the pressure of the reaction kettle at -0.1MPa, and use mechanical stirring to stir the suspension at the same time. Fully dissolved. Then, add DMF to the reactor at a volume ratio of 10:1, dilute it and place it in a centrifuge. Cathode powder and organic solution containing PVDF. Put the organic solution containing PVDF into the vacuum rotary evaporator, keep the vacuum degree at 500pa and the heating temperature at 60℃, and separate the organic mixed solvent and PVDF.

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Abstract

The invention provides a method for recycling a retired lithium ion battery positive electrode adhesive, and aims to recycle a positive electrode adhesive polyvinylidene fluoride (PVDF), so that the damage of fluorine to the positive electrode material and the pollution of fluorine to the ecological environment are reduced, and the solid waste reutilization is realized. The method comprises the following steps: soaking retired lithium ion battery positive electrode powder in an organic mixed solvent, then placing in a reaction kettle, mechanically stirring to fully dissolve an adhesive, separating by using a centrifugal machine to obtain the positive electrode powder and a PVDF-containing organic solution, and separating and recovering the organic mixed solvent and PVDF by using a vacuum rotary evaporation evaporator. According to the invention, the method is simple in process, short in flow and reasonable and feasible in technical route, the adhesive in the positive electrode powder of the retired lithium ion battery is recycled by utilizing the technology, the purity is high, the recycling rate reaches 98% or above, the adhesive can be used as a raw material for manufacturing pipes and membrane materials, and the separated organic mixed solvent can be recycled.

Description

technical field [0001] The invention relates to the field of recycling and regeneration of key materials of lithium ion batteries, in particular to a method for recycling positive electrode binders of decommissioned lithium ion batteries, which belongs to the recycling of solid waste. Background technique [0002] As an energy storage device, lithium-ion batteries have been widely used in industries such as tower base stations, new energy vehicles, 3C products, and robots due to their outstanding advantages such as good energy density, long cycle life, and no memory effect. Lithium-ion batteries are used in different scenarios, and their service life is also different. The life of lithium iron phosphate batteries used in iron base stations is as long as 20 years, the life of lithium iron phosphate batteries used in new energy vehicles is 5-7 years, and the life of ternary lithium-ion batteries used in new energy vehicles is only 3 years. -5 years, the average life of lithiu...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 王利华李荐田际德张敏超肖宜华池哲曦尚雷刘湘
Owner HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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