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Method for recovering lithium hexafluorophosphate in waste lithium ion battery

A lithium-ion battery and lithium hexafluorophosphate technology, which is applied in battery recycling, recycling by waste collectors, secondary batteries, etc., can solve the problems of low recovery rate of lithium hexafluorophosphate, high recycling cost, cumbersome steps, etc., and achieve pollution prevention, less production investment, The effect of high recovery rate

Inactive Publication Date: 2016-10-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is very little electrolyte that can be poured out in the actual battery, and most of the electrolyte is adsorbed on the positive and negative plates and separators of the battery. Therefore, the method is cumbersome, the recovery cost is high, and the recovery rate of lithium hexafluorophosphate is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Discharge the used battery to below 1V through an external resistor;

[0021] Perform cleaning and drying pretreatment of the above-mentioned air-powered waste lithium-ion batteries;

[0022] Transfer the waste lithium ion battery after the above pretreatment to a drying room, and control the dew point in the drying room below -40℃;

[0023] Disassemble the used lithium battery, remove the casing and cover, and take out the core;

[0024] Place the winding core in ethylene carbonate, a lithium hexafluorophosphate solvent, soaking at a temperature of 25°C, and a soaking time of 30min, and stirring to fully extract the lithium hexafluorophosphate in the winding core to obtain an extract of the battery electrolyte;

[0025] Filter the extract of the battery electrolyte, remove the relatively large positive and negative materials, centrifuge, and pass in anhydrous HF gas to improve the purity of lithium hexafluorophosphate in the solution;

[0026] The extract of the electrolyte is di...

Embodiment 2

[0028] Discharge the used battery in a salt-containing solution to below 1V;

[0029] Perform cleaning and drying pretreatment of the above-mentioned air-powered waste lithium-ion batteries;

[0030] Transfer the waste lithium ion battery after the above pretreatment to a drying room, and control the dew point in the drying room below -40℃;

[0031] Disassemble the used lithium battery, remove the casing and cover, and take out the core;

[0032] Place the core in the lithium hexafluorophosphate solvent diethyl carbonate, and stir to fully extract the lithium hexafluorophosphate in the core to obtain an extract of the battery electrolyte; the soaking temperature is 10°C, and the soaking time is 60min;

[0033] Filter the extract of the battery electrolyte, remove the relatively large positive and negative materials, centrifuge, and pass in anhydrous HF gas to improve the purity of lithium hexafluorophosphate in the solution;

[0034] The extract of the electrolyte is distilled under the ...

Embodiment 3

[0036] Discharge the used battery in a salt-containing solution to below 1V;

[0037] Perform cleaning and drying pretreatment of the above-mentioned air-powered waste lithium-ion batteries;

[0038] Transfer the waste lithium ion battery after the above pretreatment to a drying room, and control the dew point in the drying room below -40℃;

[0039] Disassemble the used lithium battery, remove the casing and cover, and take out the core;

[0040] Place the winding core in a mixed solution of lithium hexafluorophosphate solvent propylene carbonate and dimethyl carbonate, and stir to fully extract the lithium hexafluorophosphate in the winding core to obtain an extract of battery electrolyte; the immersion temperature is 50°C, and the immersion time is 5 minutes;

[0041] Filter the extract of the battery electrolyte, remove the relatively large positive and negative materials, centrifuge, and pass in anhydrous HF gas to improve the purity of lithium hexafluorophosphate in the solution;

...

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Abstract

The invention discloses a method for recovering lithium hexafluorophosphate in a waste lithium ion battery. The method comprises the following steps: fully discharging the waste lithium ion battery, disassembling and removing a housing and a cover plate, removing a wound core; immersing the wound core in a solvent and stirring the wound core, fully leaching lithium hexafluorophosphate in the wound core to obtain an extract of a battery solution; filtering the extract of the battery solution and centrifuging the extract, introducing centrifuge HF gas, and distilling the material to obtain lithium hexafluorophosphate. The method uses the solvent for dissolving lithium hexafluorophosphate in the positive and negative electrode plates and a diaphragm, recovery rate of lithium hexafluorophosphate is high, the production input for the method is less, lithium hexafluorophosphate with high price can be recovered by the material with low cost, material loss during a recovery process is little, considerable economic benefit is created, lithium resource waste is wasted, and pollution of lithium hexafluorophosphate and the electrolyte on environment can be prevented.

Description

[0001] technical field [0002] The invention relates to the technical field of lithium ion battery recycling, in particular to a method for recycling lithium hexafluorophosphate in waste lithium ion batteries. Background technique [0003] With the promotion and support of new energy vehicles in various countries, the lithium battery industry has developed rapidly, but a large number of waste batteries have also been produced. If these used batteries are not effectively recycled, it will not only cause serious environmental pollution, but also lead to a serious waste of resources. How to turn lithium batteries into real green energy remains to be further explored and researched. [0004] In view of this, many enterprises and universities at home and abroad have carried out the cascade utilization and material recycling of waste lithium batteries, and there are also many articles and patents on the recycling of lithium batteries. However, most of them are related to pole pi...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 胡家佳王晨旭曹利娜
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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