Waste lithium ion battery electrolyte solution recovery treatment method

A lithium-ion battery, electrolyte recycling technology, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve problems such as equipment environment, human body hazards, etc., achieve a simple and novel process route, avoid volatilization loss, no two The effect of secondary pollution

Active Publication Date: 2019-04-05
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte is volatile. During the recycling process of waste lithium batteries, the lithium hexafluorophosphate or lithium hexafluoroarsenate electrolyte will react with water or water vapor to produce hydrogen fluoride, phosphorus pentafluoride and other toxic and harmful substances, which will cause harm to equipment, the environment and the human body. harm

Method used

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  • Waste lithium ion battery electrolyte solution recovery treatment method
  • Waste lithium ion battery electrolyte solution recovery treatment method
  • Waste lithium ion battery electrolyte solution recovery treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0015] A method for recovering and treating the electrolyte of a waste lithium ion battery. The electrolyte used in the waste lithium ion battery of this embodiment is lithium hexafluorophosphate, and the waste lithium ion battery is placed in liquid nitrogen and frozen for 40 minutes until the electrolyte in the waste lithium ion battery is Solid state, then take out the waste lithium-ion battery and put it into a low-temperature pulverizer, and pulverize the solid electrolyte before it is liquefied or vaporized to obtain a pulverized mixture. The pulverization time is controlled at 2 minutes, and the temperature of the low-temperature pulverizer is controlled at -58°C. Place the pulverized mixture in a container containing a saturated lithium carbonate solution at a rate of 4.5ml of saturated lithium carbonate solution per gram of the pulverized mixture, and soak for 35 minutes until the lithium hexafluorophosphate electrolyte completely reacts to form lithium fluoride and lit...

Embodiment 2

[0020] A method for recovering and treating the electrolyte of a waste lithium ion battery, the steps of which are basically the same as those of the method for recovering and treating the electrolyte of a waste lithium ion battery in Example 1, the difference being that:

[0021] 1. The electrolyte used in waste lithium-ion batteries is lithium hexafluoroarsenate;

[0022] 2. The freezing time of used lithium-ion batteries in liquid nitrogen is 25 minutes;

[0023] 3. The crushing time of waste lithium-ion batteries in the low-temperature pulverizer is controlled at 3 minutes, and the temperature of the low-temperature pulverizer is controlled at -60°C;

[0024] 4. Each gram of pulverized mixture needs 8ml of saturated lithium carbonate solution. The soaking time of the pulverized mixture in a container filled with saturated lithium carbonate solution is 25 minutes. Lithium hexafluoroarsenate reacts completely to form lithium fluoride and lithium arsenate;

[0025] 5. The me...

Embodiment 3

[0031] A method for recovering and treating the electrolyte of a waste lithium ion battery, the steps of which are basically the same as those of the method for recovering and treating the electrolyte of a waste lithium ion battery in Example 1, the difference being that:

[0032] 1. Among the waste lithium-ion batteries, there are batteries using lithium hexafluorophosphate electrolyte and batteries using lithium hexafluoroarsenate electrolyte;

[0033] 2. The freezing time of waste lithium-ion batteries in liquid nitrogen is 60 minutes;

[0034] 3. The crushing time of waste lithium-ion batteries in the low-temperature pulverizer is controlled at 1.8 minutes;

[0035] 4. Each gram of crushed mixture needs 2ml of saturated lithium carbonate solution. The soaking time of the crushed mixture in a container filled with saturated lithium carbonate solution is 60 minutes. Lithium hexafluorophosphate and lithium hexafluoroarsenate react completely to form lithium fluoride, lithium ...

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Abstract

The invention provides a waste lithium ion battery electrolyte solution recovery treatment method comprising freezing a waste lithium ion battery in liquid nitrogen; taking out the waste lithium ion battery and pulverizing the waste lithium ion battery by a low-temperature pulverizer to obtain a pulverized mixture; fully immersing the pulverized mixture in a container filled with a saturated lithium carbonate solution for a certain period of time according to certain proportion; successively filtering a reaction product by a coarse sieve and a fine sieve to obtain an oversized product and a filtrate; and finally separating an organic solvent and a lithium carbonate solution from the filtrate in an oil-water separation device under the effect of gravity; and collecting the organic solvent from the upper liquid outlet of the oil-water separation device, and collecting the lithium carbonate solution from the lower liquid outlet of the oil-water separation device. The method of the invention is simple in process, separates the electrolyte, the organic solvent and other components of the battery from the electrolyte solution, and is small in pollution and high in safety.

Description

technical field [0001] The invention relates to a battery recovery and treatment process, in particular to a recovery and treatment method for an electrolyte solution of a waste lithium ion battery. Background technique [0002] With the development of industry, a large number of batteries are produced and used, so as time goes by, there will be more and more waste batteries, and waste batteries will cause a lot of pollution if they are not disposed of and discarded in nature . The electrolyte in lithium batteries is generally prepared from raw materials such as organic solvents, lithium hexafluorophosphate or lithium hexafluoroarsenate electrolytes, and organic additives. The electrolyte is volatile. During the recycling process of waste lithium batteries, the lithium hexafluorophosphate or lithium hexafluoroarsenate electrolyte will react with water or water vapor to produce hydrogen fluoride, phosphorus pentafluoride and other toxic and harmful substances, which will cau...

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 钟发平黄林波杨先锋
Owner 先进储能材料国家工程研究中心有限责任公司
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