Recycling method of lithium-ion battery

A lithium-ion battery, recycling technology, applied in the field of lithium-ion batteries, can solve the problems of short time consumption and high cost, and achieve the effects of short time consumption, easy recycling, and elimination of toxicity

Inactive Publication Date: 2017-03-15
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium-ion battery recovery treatment method, from the pole piece treatment link to the final resource utilization, to achieve low toxicity, low acid and alkali consumption, low waste water, compared with the conventional stripping method of dissolving aluminum foil with sodium hydroxide Compared with the present invention, the amount of lye is less, the time consumption is short, and the aluminum foil is easy to recycle, which solves the problems of pollution and high cost in the recycle process

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  • Recycling method of lithium-ion battery
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  • Recycling method of lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: For a lithium iron phosphate battery after discharge treatment, cut the disassembled positive electrode sheet into 2cm*2cm pieces, place them in a muffle furnace with a gas collection device, and step by step under the protection of an inert gas argon Heating, the temperature is raised from room temperature to 90° C. at a rate of 5° C. / min. After 1 hour of heat preservation, the temperature is raised to 400° C. at a rate of 5° C. / min. and kept at a temperature of 1.5 hours. The gas volatilized from the muffle furnace is absorbed and reacted with 1mol / L sodium hydroxide to eliminate the toxicity of volatiles. Stir the heated positive electrode sheet in 100mL 1mol / L sodium hydroxide solution for 5min until the aluminum foil and electrode material are completely separated, then take out the aluminum foil and recycle it directly. After the collected electrode materials were washed with water three times, they were dried at 90° C. to obtain 12 g of electrode mater...

Embodiment 2

[0031] Example 2: For a lithium iron phosphate battery that has undergone discharge treatment, cut the disassembled positive electrode sheet into 2cm*2cm pieces, place them in a muffle furnace with a gas collection device, and step by step under the protection of an inert gas argon Heating, the temperature is raised from room temperature to 80° C. at a rate of 5° C. / min. After 1.5 hours of heat preservation, the temperature is raised to 370° C. at a rate of 5° C. / min. and kept at a temperature of 2 hours. The gas volatilized from the muffle furnace is absorbed and reacted with 1mol / L sodium hydroxide to reduce the toxicity of volatiles. Stir the heated electrode sheet in 100mL 1mol / L sodium hydroxide solution for 10min until the aluminum foil and the electrode material are completely separated, then take out the aluminum foil directly. After the collected electrode material was washed three times with water, it was dried at 90° C. to obtain 14 g of electrode material. After d...

Embodiment 3

[0032] Example 3: For the lithium iron phosphate battery after discharge treatment, the disassembled positive electrode sheet is cut into 2cm*2cm pieces, placed in a muffle furnace with a gas collection device, heated step by step under air conditions, the temperature The temperature was raised from room temperature to 100° C. at a rate of 5° C. / min and kept at a rate of 1 hour, then raised to 450° C. at a rate of 5° C. / min and kept at a rate of 1 hour. The gas volatilized from the muffle furnace is absorbed and reacted with 1mol / L sodium hydroxide to reduce the toxicity of volatiles. Stir the heated electrode sheet in 100mL 1mol / L sodium hydroxide solution for 10min until the aluminum foil and the electrode material are completely separated, then take out the aluminum foil directly. The collected electrode materials were washed with water three times, and then dried at 90° C. to obtain 16.5 g of electrode materials. The collected electrode material is Li 3 Fe(PO 4 ) 2 wit...

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Abstract

The invention discloses a recycling method of a lithium-ion battery. The method comprises the steps of cutting electrode plates dismantled from the lithium-ion battery into pieces and carrying out stepwise heating and heat preservation in a heating furnace with a gas collection device; stirring the electrode plates subjected to heating and heat preservation into a sodium hydroxide solution until an electrode material is stripped from aluminum foil; directly recycling the aluminum foil, simultaneously collecting the electrode material, washing and drying the electrode material and then grinding the electrode material evenly in a ball grinder; and testing the content of various elements in the electrode material, supplementing corresponding element sources, mixing evenly, carrying out heating pretreatment and then roasting the product at 700-900 DEG C for 7-12 hours under argon atmosphere protection to obtain the repaired electrode material. According to the recycling method, the targets of low toxicity, low acid and alkali dosage and low wastewater are achieved from an electrode plate processing link to final resource utilization. Compared with a conventional stripping method of dissolving the aluminum foil by using sodium hydroxide, the recycling method has the advantages that the alkali liquid dosage is low, the elapsed time is short and the aluminum foil is easy to recycle.

Description

[0001] Technical field: [0002] The invention relates to the technical field of lithium ion batteries, in particular to a recycling and processing method for lithium ion batteries. [0003] Background technique: [0004] With the rapid growth of electric vehicles and various electronic consumer goods, the usage of lithium-ion batteries is also growing rapidly. For lithium-ion batteries, when the battery capacity drops to 80% of the initial capacity, its design life is reached, and the battery will be scrapped. With the growth of battery consumption, the amount of scrapped batteries is huge. If they are not recycled, it will inevitably cause waste of resources. Therefore, lithium-ion batteries contain more metals such as Co, Ni, Li, Mn, Cu, Al, Fe, etc. Recycling and reuse of resources will produce considerable economic benefits; in addition, failure to recycle will cause environmental problems, such as heavy metal pollution, electrolyte leakage and poisoning. Therefore, it i...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 陈永珍宋文吉韩颖吕杰陈明彪冯自平
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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