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A method for recycle that electrolyte of waste battery

An electrolyte recycling and waste technology, applied in battery recycling, recycling technology, waste collector recycling, etc., can solve the problems of low crystallization efficiency, high electrolyte viscosity, decomposition of lithium hexafluorophosphate, etc., to achieve the effect of recycling

Active Publication Date: 2019-01-11
山西根复科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high boiling point of the organic solvent in the electrolyte, lithium hexafluorophosphate will be decomposed during the rectification process.
Another method is to directly obtain lithium hexafluorophosphate by freezing and crystallizing after solvent leaching, but in fact, the viscosity of the battery electrolyte is very high at low temperature, and it is difficult to reach saturation to precipitate crystals, and the crystallization efficiency is very low.

Method used

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  • A method for recycle that electrolyte of waste battery

Examples

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Effect test

Embodiment 1

[0032] Firstly, the crushed battery materials are leached in stages using an organic solvent. The organic solvent is dimethyl carbonate, and the electrolyte in the battery is completely leached, and then a clarified leaching solution is obtained by settling and filtering.

[0033] The battery material is dried by heating, and the evaporated organic solvent is collected for recycling. The dried battery materials are used for the extraction of active substances in the next step.

[0034] The filtrate was transferred to a crystallization kettle, and a saturated ethanol solution of potassium hydroxide was added dropwise at 25°C, and stirred to convert lithium hexafluorophosphate in the filtrate into potassium hexafluorophosphate and lithium hydroxide. The ethanol in the reaction system was distilled off under reduced pressure, and LiOH and part of potassium hexafluorophosphate crystals were precipitated, filtered, washed with dimethyl carbonate, and dried to obtain lithium hydroxi...

Embodiment 2

[0037] Firstly, the crushed battery materials are leached by grade with an organic solvent. The organic solvent is selected from ethylene glycol dimethyl ether, and the electrolyte in the battery is completely leached, and then a clarified leaching solution is obtained by sedimentation and filtration.

[0038] The battery material is dried by heating, and the evaporated organic solvent is collected for recycling. The dried battery materials are used for the extraction of active substances in the next step.

[0039] Transfer the filtrate to a crystallization kettle, add a saturated methanol solution of sodium chloride dropwise at 25°C, and stir to convert the lithium hexafluorophosphate in the filtrate into sodium hexafluorophosphate and lithium chloride. The methanol in the reaction system was distilled off under reduced pressure, then lithium chloride and part of the crystals of sodium hexafluorophosphate were precipitated, filtered, washed with dimethyl carbonate, and dried ...

Embodiment 3

[0042] Firstly, the crushed battery materials are leached in stages using an organic solvent. The organic solvent is acetone, and the electrolyte in the battery is completely leached, and then a clarified leaching solution is obtained by settling and filtering.

[0043] The battery material is dried by heating, and the evaporated organic solvent is collected for recycling. The dried battery materials are used for the extraction of active substances in the next step.

[0044] Transfer the filtrate to a crystallization kettle, add a saturated ethanol solution of ammonium chloride dropwise at 25°C, and stir to convert the lithium hexafluorophosphate in the filtrate into ammonium hexafluorophosphate and lithium chloride. The ethanol in the reaction system was distilled off under reduced pressure, and lithium chloride crystals were precipitated, which were filtered, washed with dimethyl carbonate, and dried to obtain lithium chloride crystals.

[0045] Then through rectification u...

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Abstract

A method for recover and utilizing waste power battery electrolyte includes leaching crushed battery material with organic leaching solvent, filter after leaching to obtain clarified leaching solutionand filter residue, recovering electrolyte from crushed battery material with organic leaching solvent, recovering electrolyte from crushed battery material with organic leaching solvent, recoveringelectrolyte from crushed battery material with organic leaching solvent. Dropping an organic solvent A solution of a potassium ion compound or a metal ion compound into the leaching solution until thereaction is completed to obtain a reaction mixture; Separating an organic solvent A in the reaction mixture, and filtering to obtain a filtrate and crystals of lithium hydroxide or lithium salt; Separating the organic solvent from the filtrate to obtain potassium hexafluorophosphate or other hexafluorophosphate crystals. The invention fully considers the composition of the electrolyte and the physico-chemical characteristics of the electrolyte lithium hexafluorophosphate, by introducing the solvent leaching-lithium hexafluorophosphate conversion-rectification separation technology and the like, the recycling of electrolyte in waste batteries is realized. The technical process can realize the full recovery of electrolyte without any discharge and has the advantages of environmental protection and high efficiency.

Description

technical field [0001] The invention relates to the technical field of waste battery treatment, in particular to a method for recycling the electrolyte of waste batteries. Background technique [0002] With the development of the electric vehicle industry, the total amount of waste power batteries is increasing day by day. Long-term stacking and discarding of waste power batteries will cause environmental pollution and safety hazards. [0003] Long-term stacking and discarding of waste power batteries is also a waste of resources. Waste power batteries contain a large number of metal element compounds. Making full use of these substances can reduce mineral mining, save a lot of resources, and reduce pollution and energy consumption caused by mining. [0004] At present, in the recycling process of lithium-ion batteries, part of the process is to heat-treat the broken battery materials, and incinerate the organic components in the battery electrolyte through heat treatment to...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 张俊喜刘蔚王昆仑
Owner 山西根复科技有限公司
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