Spent lithium-ion battery electrolyte supercritical carbon dioxide extraction process and device

A lithium-ion battery and carbon dioxide technology, applied in solvent extraction, battery recycling, solid solvent extraction, etc., can solve problems such as poor production safety, frequent lifting of materials, and reduced production efficiency, and achieve mild operating temperature and pressure conditions, avoiding human body Poisoning and environmental pollution, the effect of reducing the height of the plant space

Inactive Publication Date: 2018-05-29
CAMEL GRP WUHAN OPTICS VALLEY R&D CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction kettle has the following disadvantages: (1) The material basket is hoisted from the upper part, which requires a large workshop space and increases investment; (2) Frequent hoisting of materials results in poor production safety; (3) Low degree of production automation, loading, Unloading is cumbersome, which reduces production efficiency; (4) The electrolyte is exposed for a long time, which is harmful to the environment and operators

Method used

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  • Spent lithium-ion battery electrolyte supercritical carbon dioxide extraction process and device

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Comparison scheme
Effect test

Embodiment 1

[0033] 1. Close the discharge port at the bottom of the extraction kettle, open the head 6 of the top 3 of the kettle body, start the fully sealed conveyor belt 1, crush the waste lithium-ion batteries containing the electrolyte, put them into the extraction kettle, and close the kettle The upper seal 6 on the top 3 of the body closes the charging opening on the top of the extraction kettle to complete the charging process. The waste lithium-ion battery scrap containing electrolyte is lithium cobalt oxide battery.

[0034] 2. Close the carbon dioxide outlet at the top, open the carbon dioxide inlet at the bottom, press the carbon dioxide into the extraction kettle from the carbon dioxide inlet 12 at the bottom 4 of the kettle body with a booster pump, and then use the booster pump to pump the solubility enhancer ethanol ester from the bottom 4 of the kettle body The carbon dioxide inlet 12 of the extraction kettle is pressed into the extraction kettle, and the carbon dioxide p...

Embodiment 2

[0037] 1. Close the discharge port at the bottom of the extraction kettle, which will contain LiPF 6 / (DMC+EC+DEC+VC+BP) The waste NCM ternary lithium-ion battery fragments of the electrolyte are put into the extraction kettle, and the charging opening at the top of the extraction kettle is closed to complete the charging process.

[0038] 2. Close the carbon dioxide outlet at the top, open the carbon dioxide inlet at the bottom, and turn on the heating device of the extraction kettle to keep the temperature of the extraction kettle body above 40°C and keep it constant. Use a booster pump to press carbon dioxide and solubility enhancer propane into the extraction kettle. And make the carbon dioxide pressure in the extraction tank remain constant at 10MPa, start the supercritical carbon dioxide extraction of the electrolyte solution of the waste lithium-ion battery at this moment, the consumption of described solubility enhancer propane is 15% of the electrolyte consumption cont...

Embodiment 3

[0042] 1. Close the discharge port at the bottom of the extraction kettle, which will contain LiPF 6 / (DMC+EC+VC) The waste lithium iron phosphate battery fragments of the electrolyte are put into the extraction kettle, and the charging opening at the top of the extraction kettle is closed to complete the charging process.

[0043] 2. Close the carbon dioxide outlet at the top, open the carbon dioxide inlet at the bottom, turn on the heating device of the extraction kettle, keep the temperature of the extraction kettle at 50°C and keep it constant, and press the carbon dioxide and the solubility enhancer diethyl carbonate into the Extraction kettle, and make the carbon dioxide pressure in the extraction kettle keep at 17MPa and keep constant, start the supercritical carbon dioxide extraction of spent lithium-ion battery electrolyte at this moment. The amount of the solubility enhancer diethyl carbonate is 30% by weight of the amount of electrolyte contained in the waste lithiu...

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Abstract

The invention discloses a spent lithium-ion battery electrolyte supercritical carbon dioxide extraction process and device. The process comprises the process steps of charging, extracting and separating. A reaction kettle is changed into an up feeding and bottom discharging mode, a full-sealed conveying belt is used, up lifting and charging of a basket are omitted in charging, crushed spent lithium-ion batteries are conveyed to the top of the reaction kettle by the full-sealed conveying belt and charged, the requirement for the space height of a factory building is reduced, and safety in the production process is improved. Raffinate is sucked out and discharged by negative pressure after extraction, and production efficiency is improved. By taking the advantage of high cleaning and separating efficiency of supercritical carbon dioxide, and body poison and environmental pollution caused by residual solvents in solvent extraction are avoided. According to the process, operation temperature and pressure conditions are mild, degradation and dissipation of thermosensitive substances are effectively prevented, the recovery rate of the electrolyte is higher than 80%, and zero organic solvent discharge and high production efficiency are realized.

Description

technical field [0001] The invention relates to a supercritical carbon dioxide extraction process and device, in particular to a waste lithium ion battery electrolyte extraction process and device with upper feeding and lower discharging. Background technique [0002] Supercritical carbon dioxide extraction technology is a new type of extraction technology developed after 1980. Carbon dioxide is especially suitable for the extraction of heat-sensitive substances due to its consistent critical conditions, non-toxic, flame-retardant, cheap and easy to obtain, and good solubility. Therefore, it has occupied a dominant position in the food industry and natural flavor industry, catering to the requirements of today's industrialized production that emphasizes environmental protection and sustainable development. [0003] The electrolyte of waste lithium-ion batteries is adsorbed in the positive and negative active materials and separators of lithium-ion batteries. The electrolyte ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02H01M10/54
CPCY02W30/84B01D11/0203B01D11/0288H01M10/54
Inventor 刘元龙刘道坦夏诗忠刘长来聂斌斌崔洪涛
Owner CAMEL GRP WUHAN OPTICS VALLEY R&D CENT CO LTD
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