Recovery method of waste lithium-ion battery electrolyte

A technology for lithium-ion batteries and recovery methods, which is applied in the field of recovery of lithium-ion battery electrolytes, and can solve the problems of low utilization value of by-products of lithium-ion battery electrolytes

Active Publication Date: 2020-06-23
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the technical solutions of the above-mentioned existing patents have low utilization value to the recovery rate of the lithium-ion battery electrolyte and the by-products

Method used

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  • Recovery method of waste lithium-ion battery electrolyte

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Effect test

Embodiment 1

[0058] (1) Stir and mix 150 cells of used and used lithium-ion batteries with graphite powder, perform deep discharge treatment, then disassemble, and extract the electrolyte for subsequent recovery;

[0059] (2) Add 2.1mol aluminum hydroxide powder to 2mol of the electrolyte to obtain a mixture;

[0060] (3) sodium hydroxide is added in the mixture, the pH value is adjusted to 1.3, and then the filtration operation is carried out to obtain the first filtrate and AlPO 4 ;

[0061] (4) add 2.5mol aluminum hydroxide powder in described first filtrate, pH value is adjusted to 6.0, carry out filtration operation again, obtain the second filtrate and NaAlF 4 ;

[0062] (5) in the second filtrate, add CaO, the pH value is adjusted to 10.0, then carry out filtration operation, obtain the 3rd filtrate and Ca(H 2 PO4) 2 and CaSO 4 mixed solids;

[0063] (6) Add salt of wormwood in the 3rd filtrate, obtain the lithium salt of embodiment 1.

Embodiment 2

[0065] (1) Stir and mix 150 cells of used and used lithium-ion batteries with graphite powder, perform deep discharge treatment, then disassemble, and extract the electrolyte for subsequent recovery;

[0066] (2) Add 2.1mol aluminum sulfate solution to 2mol described electrolyte solution, obtain mixture;

[0067] (3) sodium hydroxide is added in the mixture, the pH value is adjusted to 1.3, and then the filtration operation is carried out to obtain the first filtrate and AlPO 4 ;

[0068] (4) add 2.5mol aluminum hydroxide powder in described first filtrate, pH value is adjusted to 6.2, carry out filtration operation again, obtain the second filtrate and NaAlF 4 ;

[0069] (5) in the second filtrate, add CaO, the pH value is adjusted to 10.0, then carry out filtration operation, obtain the 3rd filtrate and Ca(H 2 PO4) 2 and CaSO 4 mixed solids;

[0070] (6) Add salt of wormwood in the 3rd filtrate, obtain the lithium salt of embodiment 2.

Embodiment 3

[0072] (1) Stir and mix 150 cells of used and used lithium-ion batteries with graphite powder, perform deep discharge treatment, then disassemble, and extract the electrolyte for subsequent recovery;

[0073] (2) Add 1.1mol aluminum hydroxide powder and 1.3mol aluminum sulfate solution to 2mol described electrolytic solution, obtain mixture;

[0074] (3) sodium hydroxide is added in the mixture, the pH value is adjusted to 1.4, and then the filtration operation is carried out to obtain the first filtrate and AlPO 4 ;

[0075] (4) add 2.5mol aluminum hydroxide powder in described first filtrate, pH value is adjusted to 6.5, carry out filtration operation again, obtain the second filtrate and NaAlF 4 and Na 3 AlF 6 ;

[0076] (5) in the second filtrate, add CaO, the pH value is adjusted to 10.0, then carry out filtration operation, obtain the 3rd filtrate and Ca(H 2 PO4) 2 and CaSO 4 mixed solids;

[0077] (6) Add salt of wormwood in the 3rd filtrate, obtain the lithium ...

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Abstract

The invention provides a recycling method of electrolyte of waste lithium ion batteries. The method comprises the following steps: extracting electrolyte of waste lithium ion batteries to obtain electrolyte, successively adding an aluminum-containing agent and an alkali regulator into the electrolyte, carrying out segmented regulation of a pH value of a reaction system and filtering to successively obtain AlPO4, NaxAlF3+x (x is 1 or 3) and second filtrate, then adding CaO and / or Ca(OH)2 into the second filtrate, regulating the pH value of the reaction system and filtering to obtain third filter residues and third filtrate, then adding carbonate into the third filtrate to obtain lithium salt. Through the recycling method of the electrolyte of the waste lithium ion batteries, the recycled materials such as AlPO4, NaxAlF3+x (x is 1 or 3), the third filter residues and the lithium salt and the like are obtained; the recycled materials have different use and can be further recycled; the recovery rate of the electrolyte of the lithium ion batteries and the utilization values of the by-products are greatly increased.

Description

technical field [0001] The invention relates to the field of lithium ion battery recovery, in particular to a recovery method for lithium ion battery electrolyte. Background technique [0002] Today, most electronic devices such as smartphones, tablets, wearables, and electric vehicles use rechargeable lithium-ion batteries. However, after two to three years of use, these lithium-ion batteries will degrade in function and efficiency, or even reach the end of their life. Once the electrolyte of waste lithium-ion batteries flows into the soil or leaks into the environment, it will cause great pollution. Therefore, how to safely and effectively collect the electrolyte from waste lithium-ion batteries is of great significance. [0003] The existing patent CN201611060474.0 discloses an environmentally friendly and efficient recovery and separation process based on lithium-ion batteries in waste mobile phones. The main processes include salt water discharge, disassembly and crush...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 祝宏帅李刚陈郑阳陈翔刘金成
Owner EVE ENERGY CO LTD
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