Method for recycling and treating electrolytic solution of lithium ion battery

Patent metadata

Field	Value
Publication number	US-12525662-B2
Application number	US-202218288725-A
Country	US
Kind code	B2
Filing date	Sep 22, 2022
Priority date	Aug 15, 2022
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A method for recycling and treating an electrolytic solution of a lithium ion battery includes S1: cooling a fully discharged lithium ion battery below a freezing point of the electrolytic solution, and then disassembling and crushing the lithium ion battery to obtain a crushed solid containing the electrolytic solution, S2: under a protection of an inert gas, placing the crushed solid in a supercritical CO2 extraction instrument in which an entrainer is added; S3: conducting extraction; and S4: collection an extraction product with a cryogenic device, and adsorbing water in the extraction product using a 4 Å type lithiated molecular sieve, adsorbing HF in the extraction product using weak-base anion-exchange resin and adsorbing organic acid and alcohol in the extraction product using a 5 Å type lithiated molecular sieve.

First claim

The invention claimed is:

1 . A method for recycling and treating an electrolytic solution of a lithium ion battery, comprising:
S1: cooling a fully discharged lithium ion battery below a freezing point of the electrolytic solution, and then disassembling and crushing the lithium ion battery to obtain a crushed solid containing the electrolytic solution; S2: under a protection of an inert gas, placing the crushed solid in a supercritical CO 2 extraction instrument in which an entrainer is added; S3: conducting co-extraction with a supercritical CO 2 and the entrainer; and S4: collecting an extraction product which comprises water, hydrofluoric acid (HF), organic acid and alcohol with a cryogenic device, and adsorbing water in the extraction product using a 4 Å type lithiated molecular sieve, adsorbing HF in the extraction product using weak-base anion-exchange resin and adsorbing organic acid and alcohol in the extraction product using a 5 Å type lithiated molecular sieve; wherein the extraction comprises static extraction and dynamic extraction; the entrainer is a cyclic carbonate entrainer, and when the dynamic extraction starts, the addition flow rate of the cyclic carbonate entrainer is 8% of a flow rate of the supercritical CO 2 ; or the entrainer is a cyclic carbonate-N,N-dimethylformamide mixed entrainer, wherein the mass ratio of cyclic carbonate to N,N-dimethylformamide is 4:1, and when the dynamic extraction starts, the addition flow rate of the cyclic carbonate-N,N-dimethylformamide mixed entrainer is 8% of the flow rate of the supercritical CO 2 ; and the 4 Å type lithiated molecular sieve is made by lithiating a 4 Å type molecular sieve with a LiCl ethanol solution, wherein a concentration of the LiCl ethanol solution is 1.8-2.2 mol/L; and a number of lithiation treatments is 5-10 times; and/or, the 5 Å type lithiated molecular sieve is made by lithiating a 5 Å type molecular sieve with a LiCl ethanol solution, wherein a concentration of the LiCl ethanol solution is 1.8-2.2 mol/L; and a number of lithiation treatments is 5-10 times.

2 . The method for recycling and treating the electrolytic solution of the lithium ion battery according to claim 1 , wherein time for the static extraction is 18-22 min, and time for the dynamic extraction is 35-55 min.

3 . The method for recycling and treating the electrolytic solution of the lithium ion battery according to claim 1 , wherein for the extraction, a pressure is 21-35 MPa, and a temperature is 40-55° C.

Assignees

• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd

Inventors

• Li Aixia
• Zhang Xuemei
• Yu Haijun
• Xie Yinghao
• Li Changdong

Classifications

• B01D15/363

  Anion-exchange · CPC title

• B01D15/34

  Size-selective separation, e.g. size-exclusion chromatography; Gel filtration; Permeation · CPC title

• B01D11/0203

  with a supercritical fluid · CPC title

• B09B2101/16

  Batteries · CPC title

• B09B3/80

  involving an extraction step · CPC title