Method for recycling waste lithium ion battery electrolyte by using supercritical CO2 fluid

A lithium-ion battery and supercritical technology, applied in ion exchange, battery recycling, recycling technology and other directions, can solve the problems of polluting the environment with organic solvents, difficult to separate and other problems, and achieve large adsorption capacity, good extraction effect and high extraction rate. Effect

Active Publication Date: 2019-12-03
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the environment is polluted and the organic solvent is difficult to separate when the lithium-ion battery electroly

Method used

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  • Method for recycling waste lithium ion battery electrolyte by using supercritical CO2 fluid
  • Method for recycling waste lithium ion battery electrolyte by using supercritical CO2 fluid
  • Method for recycling waste lithium ion battery electrolyte by using supercritical CO2 fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0049] When the extraction pressure is 24MPa, the extraction temperature is 40°C, and the extraction time is 50min, use 10×12cm 2 PE non-woven fabric is used as the adsorption material, under this condition, the supercritical CO 2 The extraction rate of the fluid to the electrolyte of the spent lithium-ion battery is 73.13%. The extractant is composed of three solvents: DMC, EMC and EC, and does not contain conductive salts.

Embodiment 2

[0051] Compared with Example 1, the difference is that the adsorption material used in Example 2 is 10 × 12cm 2 Non-woven fabric (20g / m 2 ), under this condition, supercritical CO 2 The extraction rate of the fluid to the spent lithium-ion battery electrolyte is 66.58%. The extractant is all composed of DMC, EMC and EC solvents, and does not contain conductive salts.

Embodiment 3

[0053] Compared with Example 1, the difference is that the adsorbent material used in Example 3 is 10 × 12cm 2 Non-woven fabric (30g / m 2 ), under this condition, supercritical CO 2 The extraction rate of the fluid to the electrolyte of the spent lithium-ion battery is 68.72%. The extractant is composed of three solvents: DMC, EMC and EC, and does not contain conductive salts.

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Abstract

The invention provides a method for recycling waste lithium ion battery electrolyte by using supercritical CO2 fluid. The extraction method mainly comprises the steps that (1) a waste lithium ion battery is fully discharged and disassembled, and a casing, positive and negative electrode materials and a cover plate are removed; (2) under the protection of inert gas, a free electrolyte is adsorbed by an adsorption material and completely transferred to a supercritical extraction apparatus; (3) the pressure, temperature, extraction time and flow rate of the supercritical CO2 fluid are set to extract an organic solvent; and (4) exhaust gas is absorbed by an exhaust gas absorption device, and the extract is collected by a cryogenic device. The lithium ion battery electrolyte recycling process provided by the invention has the advantages of simple operation, high recycling rate and fast extraction and recycling speed, and omits subsequent complicated processing procedures.

Description

technical field [0001] The invention relates to the field of recycling and reuse of solid waste, in particular to the field of recycling and reuse of electrolyte solution of waste lithium-ion batteries. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in recent years as important energy storage and conversion devices for powering portable electronic devices and even electric vehicles due to their high voltage, high energy density, and long cycle life. As lithium-ion batteries are used more and more widely, production and consumption are gradually increasing, and the number of discarded lithium-ion batteries is also increasing year by year, which has brought huge pressure to the environment and caused serious pollution. [0003] There are several treatment methods for the electrolyte of lithium-ion batteries. Although the vacuum pyrolysis method can effectively avoid the fluorine pollution and harm caused by the electrolyte during the battery r...

Claims

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Application Information

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IPC IPC(8): H01M10/54B01D15/08
CPCH01M10/54B01D15/08Y02W30/84
Inventor 王威陈艳丽高焓玉陈智栋
Owner CHANGZHOU UNIV
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