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Full recovery method of waste lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as demolition, high enrichment process requirements, unstable lithium hexafluorophosphate, and increased process costs, and achieve environmental protection, high feasibility, and resource conservation. Effect

Active Publication Date: 2019-09-06
中科行发医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can effectively recover lithium hexafluorophosphate, lithium hexafluorophosphate is unstable and easy to decompose, which requires high requirements for demolition and enrichment processes, which increases the process cost
[0004] At present, the industrial treatment of waste lithium-ion battery electrolyte is calcination and cracking after heating and evaporation. The cracking of organic solvents requires high-temperature calcination, which consumes energy, and the ethylene carbonate, propylene carbonate, and additives contained in the electrolyte have relatively high High value, direct calcination is contrary to the sustainable development strategy advocated by the country

Method used

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  • Full recovery method of waste lithium ion battery electrolyte

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Effect test

Embodiment 1

[0023] A method for fully recovering waste lithium-ion battery electrolyte, the steps are as follows:

[0024] (1) Cleaning process

[0025] Soak the waste lithium ion battery containing waste electrolyte with dimethyl carbonate solvent, and extract the electrolyte after ultrasonic, stirring and filtering;

[0026] (2) Cleaning solvent recovery process

[0027] Control the vacuum to be 100mbar and the temperature to be 30°C for vacuum distillation, recover the dimethyl carbonate solvent used in step (1), and collect the electrolyte;

[0028] (3) Recovery process of organic solvents and additives

[0029] Add water to the collected electrolyte in step (2), heat at 30°C, filter to obtain lithium salt precipitation and filtrate, pass the filtrate into the extraction tower, and purify and separate the organic phase one by one through the rectification tower. The number of plates in the rectification tower is 40 blocks, reaction temperature is 150℃, operating pressure is 20KPa, reflux ratio ...

Embodiment 2

[0035] A method for fully recovering waste lithium-ion battery electrolyte, the steps are as follows:

[0036] (1) Cleaning process

[0037] Soak the waste lithium ion battery containing waste electrolyte with ethyl methyl carbonate solvent, and extract the electrolyte after ultrasonic, stirring and filtering;

[0038] (2) Cleaning solvent recovery process

[0039] Control the vacuum to 500mbar and the temperature to 100°C to perform vacuum distillation, recover the ethyl methyl carbonate solvent used in step (1), and collect the electrolyte;

[0040] (3) Recovery process of organic solvents and additives

[0041] Add water to the collected electrolyte in step (2), heat at 100°C, and filter to obtain lithium salt precipitation and filtrate. The filtrate is passed into the extraction tower, and the organic phase is purified and separated one by one through the rectification tower. The number of plates in the rectification tower is 80 Block, reaction temperature is 250°C, operating pressu...

Embodiment 3

[0047] A method for fully recovering waste lithium-ion battery electrolyte, the steps are as follows:

[0048] (1) Cleaning process

[0049] Soak the waste lithium ion battery containing waste electrolyte with diethyl carbonate solvent, and extract the electrolyte after ultrasonic, stirring and filtering;

[0050] (2) Cleaning solvent recovery process

[0051] Control the vacuum to 200mbar and the temperature to 50°C to perform vacuum distillation, recover the diethyl carbonate solvent used in step (1), and collect the electrolyte;

[0052] (3) Recovery process of organic solvents and additives

[0053] Add water to the collected electrolyte in step (2), heat at 50°C, and filter to obtain lithium salt precipitation and filtrate. The filtrate is passed into the extraction tower, and the organic phase is purified and separated one by one through the rectification tower. The number of plates in the rectification tower is 5 Block, the reaction temperature is 50°C, the operating pressure is ...

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Abstract

The invention provides a full recovery method of waste lithium ion battery electrolyte, aiming at recovering valuable lithium salts, organic solvents and additives in the waste electrolyte, and recovering harmful impurities such as fluorine, phosphorus and the like after harmless treatment. According to the invention, after cleaning, cleaning solvent recovery, organic solvent and additive recovery, fluorine and phosphorus recovery and lithium salt recovery processes, lithium salt is finally recovered in the form of lithium carbonate, organic solvent and additive are separated, purified and recycled, and fluorine and phosphorus are recovered in the form of precipitation. The process is simple and feasible. Waste electrolyte is fully recycled and has no pollution to the environment. The recovery rate of components of waste electrolyte is over 95%, which is suitable for large-scale industrial application.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for fully recovering waste lithium ion battery electrolyte. Background technique [0002] With the global energy crisis and environmental pollution intensifying, the development and application of new energy is imperative. Lithium-ion batteries have been developing rapidly since they were commercialized in the 1990s. Compared with traditional chemical batteries, it has the advantages of light weight, small size, high voltage, high specific energy, wide operating temperature range, high specific power, stable discharge, long storage time, no memory effect, and no pollution. At present, lithium-ion batteries have been widely used in portable electronic products such as mobile phones, digital cameras, notebook computers, and have shown wide application prospects in electric vehicles (EV), hybrid electric vehicles (HEV), and energy storage systems. It is the "21st Century G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01B25/32C01F11/22H01M10/54
CPCC01B25/325C01D15/08C01F11/22H01M10/54Y02W30/84
Inventor 张锁江张鹏飞徐松刘艳侠李晶晶柴丰涛
Owner 中科行发医疗科技有限公司
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