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supercritical co 2 Method for Fluid Recovery of Waste Lithium-ion Battery Electrolyte

A lithium-ion battery, supercritical technology, applied in ion exchange, battery recovery, ion exchange regeneration and other directions, can solve the problems of difficult separation, environmental pollution of organic solvents, etc., to achieve large adsorption capacity, good extraction effect, high extraction rate. Effect

Active Publication Date: 2022-04-22
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 electrolyte is recovered, the present invention proposes a method using supercritical CO 2 Fluid Technology Recycling Method for Waste Lithium-ion Battery Electrolyte

Method used

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  • supercritical co <sub>2</sub> Method for Fluid Recovery of Waste Lithium-ion Battery Electrolyte
  • supercritical co <sub>2</sub> Method for Fluid Recovery of Waste Lithium-ion Battery Electrolyte
  • supercritical co <sub>2</sub> Method for Fluid Recovery of Waste Lithium-ion Battery Electrolyte

Examples

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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 present invention provides a method using supercritical CO 2 The invention discloses a method for fluidly recycling the electrolyte of spent lithium-ion batteries. The extraction method mainly includes the following steps: (1) fully discharge the waste lithium-ion battery, disassemble it, and remove the casing, positive and negative electrode materials and cover plates; (2) use an adsorption material to extract the free electrolyte After adsorption, they are all transferred to the supercritical extraction instrument; (3) set the supercritical CO 2 The pressure, temperature, extraction time and flow rate of the fluid are used to extract the organic solvent; (4) use the tail gas absorption device to absorb the tail gas, and the extract is collected by a low temperature device. The technological process for recovering the lithium-ion battery electrolyte provided by the invention is simple in operation, high in recovery rate, fast in extraction and recovery speed, and omits subsequent complicated treatment 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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Patent Type & Authority Patents(China)
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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