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Method for recovering electrolyte of waste lithium ion battery

A lithium-ion battery, electrolyte recycling technology, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve problems such as unfavorable industrial production, high equipment requirements, complex processes, etc., to achieve simple treatment, less equipment investment , the effect of simple process

Inactive Publication Date: 2015-05-06
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have the disadvantages of low efficiency, high energy consumption, complex process, high requirements for equipment, and are not conducive to industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Discharge the collected waste lithium-ion batteries, discharge the residual power of the waste lithium batteries, and dissect the batteries under the condition of humidity <30%, put the battery cells into a centrifuge to separate them, and obtain the waste electrolyte;

[0024] 2) Filter the waste electrolyte obtained in step 1), add activated carbon with a weight ratio of 1 / 5 for 30 minutes to decolorize;

[0025] 3) Add the waste electrolyte obtained in step 2) to molecular sieves with a weight ratio of 1 / 5, and dehydrate at room temperature for 3 hours;

[0026] 5) Analyze the composition of the waste electrolyte obtained in step 3), supplement electrolyte and organic solvent, and make lithium-ion battery electrolyte. The electrolyte composition is EC: DMC=1:1 (weight ratio), LiPF 6 The concentration is 1mol / L.

Embodiment 2

[0028] 1) Collect waste lithium-ion batteries, discharge the residual power of the waste lithium-ion batteries, clean and remove impurities on the surface of the batteries, dry them under the condition of humidity <30%, then dissect them, smash the battery cells, and use centrifugation to obtain waste electrolyte , then add 10 g each of ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC), and repeat the countercurrent washing method 3 times to collect the washing solution;

[0029] 2) Concentrate the collected washing liquid by distillation, and continue to use the solvent obtained by distillation as washing liquid. After concentration, the washing liquid and the waste electrolyte are mixed and recovered to obtain a mixed waste electrolyte;

[0030] 3) Filter the mixed waste electrolyte obtained in step 2), and add 1 / 10 weight ratio of activated carbon to adsorb for 5 hours for decolorization;

[0031] 4) Add the mixed wa...

Embodiment 3

[0034] 1) Collect waste lithium-ion batteries, discharge the residual power of the waste lithium-ion batteries, clean and remove impurities on the surface of the batteries, dry them under the condition of humidity <30%, then dissect them, smash the battery cells, and use centrifugation to obtain waste electrolyte , then add 15g each of ethylene carbonate (EC) and diethyl carbonate (DEC), repeat the countercurrent washing method 3 times, and collect the washing solution;

[0035] 2) Concentrate the collected washing liquid by distillation, and continue to use the solvent obtained by distillation as washing liquid. After concentration, the washing liquid and the waste electrolyte are mixed and recovered to obtain a mixed waste electrolyte;

[0036] 3) Filter the mixed waste electrolyte obtained in step 2), and add 1 / 8 weight ratio of activated carbon to adsorb for 3 hours for decolorization;

[0037] 4) Add the mixed waste electrolyte solution obtained after decolorization in st...

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Abstract

The invention discloses a method for recovering electrolyte of a waste lithium ion battery. The method comprises the following steps: (1) dissecting the waste lithium ion battery, taking out a battery cell, and separating the battery cell in a centrifugal machine to obtain the waste electrolyte; (2) filtering, decoloring and dehydrating the waste electrolyte; (3) carrying out component analysis on the dehydrated waste electrolyte, supplementing electrolyte and organic solvent, adjusting the electrolyte to the component proportion of the electrolyte for the lithium ion battery, and thus producing an electrolyte product. By adopting the method, the recycling of the electrolyte of the waste lithium ion battery can be realized, the environmental pollution caused by the electrolyte can be avoided, and high efficiency and environmental protection can be realized. The recycled product can be used as the electrolyte to be returned to the lithium battery industry, so that the resource is saved, and the pollution is reduced.

Description

technical field [0001] The invention relates to the field of recycling lithium ion batteries, in particular to a method for recycling the electrolyte of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in electronics, transportation, and other fields because of their significant advantages such as high voltage, large capacity, low cost, good safety performance, long life, no memory effect, and environmental friendliness. With the development of science and technology and the rapid development of the electric vehicle industry, people's demand for lithium-ion batteries has increased sharply, and the consumption of lithium-ion batteries is increasing. It is expected that in the next few years, a large number of waste batteries will be generated after the end of life of lithium-ion batteries. Lithium-ion electrolyte is an organic liquid, which will absorb water and deteriorate in the air. At the same time, it contains toxic compon...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 李荐何帅周宏明
Owner HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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