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Waste electrolyte treatment method for lithium-ion battery

A technology of a lithium ion battery and a treatment method, which is applied in the field of waste lithium ion battery electrolyte treatment, can solve the problems of low recovery efficiency and difficult operation, and achieves the effects of reducing environmental protection pressure, high operational safety, and controllable reaction.

Inactive Publication Date: 2018-11-30
HUIZHOU CAPCHEM CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an environmentally friendly lithium-ion battery electrolyte treatment method with safe operation, high resource utilization rate and environmental protection for the existing waste lithium-ion battery electrolyte treatment operation difficulty and low recovery efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] At room temperature, in a 1000ml three-necked flask, pour 400g of a prepared sodium hydroxide solution with a concentration of 20%, magnetically stir, set the stirring speed to 300r / min, and the initial temperature of the solution in the three-necked flask is 29℃. Add one drop slowly A lithium-ion battery electrolyte containing lithium hexafluorophosphate, lithium difluorophosphate and other electrolyte lithium salts, the drip rate is 1kg / h, and the temperature change of the solution and the change of the system pH are monitored. With the increase of the amount of electrolyte dripping, the three-neck bottle The inner solution changed from colorless to light yellow, until a large amount of white solid was slowly precipitated, and stirring was difficult. The pH value of the solution system was detected to be 9.56, and the temperature of the solution was 30℃. Stop the dropwise addition of the lithium ion battery electrolyte for a total of 2 hours. Electrolyte solution is 550...

Embodiment 2

[0028] At room temperature, in a 2000ml three-necked flask, pour 800g of a prepared sodium hydroxide solution with a concentration of 50%. Stir mechanically. The stirring speed is set to 200r / min. The initial temperature of the solution in the three-necked flask is 30℃. A lithium-ion battery electrolyte containing lithium hexafluorophosphate, lithium difluorophosphate and other electrolyte lithium salts, the drip rate is 5kg / h, and the temperature change of the solution and the pH change of the system are monitored. With the increase of the amount of electrolyte dripping, the three-neck bottle The inner solution changed from colorless to light yellow, until a large amount of white solid was slowly precipitated. The pH value of the solution system was detected to be 8.56, and the temperature of the solution was 33℃. Stop adding the lithium-ion battery electrolyte for a total of 4 hours and add 1250g of the electrolyte. , Filter to obtain 382g of wet solid weight, collect the filt...

Embodiment 3

[0030] At room temperature, in a 200L stainless steel reactor, pour 80Kg of a prepared sodium hydroxide solution with a concentration of 10%, mechanically stir, set the stirring speed to 120r / min, the initial temperature in the kettle is 26°C, and the jacket circulating water is turned on. Slowly add a lithium-ion battery electrolyte containing lithium hexafluorophosphate, lithium difluorophosphate, lithium difluorosulfonate imide and other electrolyte lithium salts, with a dropping acceleration rate of 10kg / h, and monitor the temperature change of the solution and the change of the system pH , With the increase of the amount of electrolyte added, observe the kettle through the sight glass, it is found that the solution in the kettle has changed from colorless to light yellow, until a large amount of white solid is slowly precipitated, and the pH value of the solution system is 8.26, indicating the solution When the temperature is 27℃, stop dripping the electrolyte of the lithiu...

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Abstract

The invention discloses a waste electrolyte treatment method for lithium-ion battery which comprises the following steps: S1, adding the waste electrolyte into a basic solution for reaction, and forming a three-phase system comprising a solid phase, an organic phase and a water phase, wherein the addition speed is 0.5 to 30 kg / h, the stirring speed during the reaction is 20 to 300 r / min, the reaction temperature is 20 to 80 DEG C and the reaction time is 2 to 8 h; S2, performing solid-liquid separation on the three-phase system in S1 to obtain a solid phase and a liquid phase, standing and layering the liquid phase to separate the organic phase and the water phase; S3, putting the solid phase in S2 into water, heating and dissolving, cooling and performing recrystallization to obtain the crystal and recrystallized mother liquor. The waste electrolyte treatment method for lithium-ion battery provided by the invention has advantages of safe operation, high effective utilization rate of sources and environmental protection and the like.

Description

Technical field [0001] The invention relates to the treatment of waste lithium-ion battery electrolyte, in particular to a treatment method for the electrolyte that appears during the recovery process of the lithium-ion battery or the electrolyte to be scrapped by the electrolyte production enterprise. Background technique [0002] Lithium-ion battery electrolyte is usually prepared from raw materials such as high-purity lithium salt, aprotic solvents and additives under certain conditions and in certain proportions. Lithium-ion electrolyte is a key electronic chemical material necessary for the production of lithium-ion batteries, and its market demand is also increasing year by year. The demand for electrolyte for a lithium-ion battery depends on the size and purpose of the battery. The demand for electrolyte varies from battery to battery, and the difference is huge. For example, mobile phone batteries generally use 2.6 to 3 grams, computer notebook batteries generally use 60...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 王帮应李孝君程萌陈群曹英杰
Owner HUIZHOU CAPCHEM CHEM CO LTD
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