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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AI-Extracted 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 pl...

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Method used

Filter the extract of battery electrolyte, remove larger positive and negative pole materials, centrifugal, and pass into anhydrous HF gas, to improve lithium hexafluorophosphate purity in solution;

The extracting solution of battery electrolyte is filtered, removes larger positive and negative electrode materia...

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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.

Application Domain

Waste accumulators reclaimingBattery recycling

Technology Topic

Lithium electrodeLithium hexafluorophosphate +6

Examples

Experimental program(3)

Example Embodiment

[0019] Example 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 distilled under the conditions of 3000 Pa and 140° C. to obtain lithium hexafluorophosphate crystals with higher purity; the ethylene carbonate obtained by condensation after distillation is recovered and used for the leaching of lithium hexafluorophosphate in the winding core.

Example Embodiment

[0027] Example 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 conditions of 2000Pa and 126°C to obtain lithium hexafluorophosphate crystals with higher purity; the diethyl carbonate obtained by condensation after distillation is recovered and used for the leaching of lithium hexafluorophosphate in the winding core.

Example Embodiment

[0035] Example 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;

[0042] The extract of the electrolyte is distilled under the conditions of 4000Pa and 100°C to obtain lithium hexafluorophosphate crystals with higher purity; the propylene carbonate and dimethyl carbonate obtained by condensation after distillation are recovered and reused for the leaching of lithium hexafluorophosphate in the core.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce production input
High recovery rate

Method for recovering lithium hexafluorophosphate in waste lithium ion battery

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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