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A kind of selective oxygen permeable film and its preparation method and application

An oxygen-permeable membrane, selective technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of reducing battery performance, consumption of lithium anode, battery failure, etc., to achieve low adsorption capacity, promote immobilization, The effect of blocking carbon dioxide

Active Publication Date: 2022-04-22
易航时代(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of alkaline solution also brings obvious disadvantages, such as metal-air battery with open system, alkaline solution can easily absorb carbon dioxide (CO2) in the air. 2 ), causing acidification of the electrolyte and reducing battery performance
Lithium-air batteries use non-aqueous electrolytes that are exposed to carbon dioxide (CO 2 ) or water vapor in the air will cause serious side reactions, consume the lithium anode, and cause the battery to fail

Method used

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  • A kind of selective oxygen permeable film and its preparation method and application
  • A kind of selective oxygen permeable film and its preparation method and application
  • A kind of selective oxygen permeable film and its preparation method and application

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preparation example Construction

[0031] The invention provides a method for preparing a selective oxygen-permeable membrane, comprising the following steps:

[0032] Mix metal-organic framework material ZIF-8, dopamine hydrochloride, alkaline substance and water for oxidative self-polymerization to obtain ZIF-8@PDA powder;

[0033] Adding the ZIF-8@PDA powder and polymethyl methacrylate into an organic solvent to obtain a slurry;

[0034] 3D printing the slurry on glass to obtain a glass plate with a mixed matrix film;

[0035] When the glass plate with the mixed matrix membrane is immersed in water, the film will automatically separate from the glass plate to obtain the selective oxygen-permeable membrane.

[0036] The invention mixes the metal-organic framework material ZIF-8, dopamine hydrochloride, alkaline substance and water, carries out oxidative self-polymerization, and obtains ZIF-8@PDA powder. In the present invention, the mass ratio of the metal-organic framework material ZIF-8 to dopamine hydroc...

Embodiment 1

[0056] Zn(NO 3 ) 2 ·6H 2 O (0.734g) was dissolved in 50mL of anhydrous methanol to obtain a Zn-containing solution, and then 0.811g of 2-methylimidazole and 0.929g of 1-vinylimidazole were dissolved in another 50mL of anhydrous methanol to obtain a ligand-containing solution, quickly pour the solution containing the ligand into the Zn-containing solution, keep it at room temperature for 6 hours, wash it with anhydrous methanol, and dry it in an oven at 50°C for 1 hour. Then take it out and grind it with a mortar until there is no graininess, and the metal organic framework material ZIF-8 is obtained. The physical picture of the metal organic framework material ZIF-8 is as follows figure 1 shown.

[0057] Weigh 0.5g tris hydroxymethyl amino methane dissolved in 400mL H 2 O to prepare an alkaline solution with a pH of 8. Then, weigh 0.4g ZIF-8 powder and disperse in 100mL H 2 O, then 1.5 g of dopamine hydrochloride was added to the above dispersion solution under vigorous ...

Embodiment 2

[0076] Zn(NO 3 ) 2 ·6H 2 O (0.734g) was dissolved in 50mL of anhydrous methanol to obtain a Zn-containing solution, and then 0.811g of 2-methylimidazole and 0.929g of 1-vinylimidazole were dissolved in another 50mL of anhydrous methanol to obtain a ligand-containing solution, quickly pour the solution containing the ligand into the Zn-containing solution, keep it at room temperature for 10 hours, wash it with anhydrous methanol, and dry it in a 50°C oven for 1 hour. The product obtained is collected by a high-speed centrifuge and washed with anhydrous methanol Three times, oven-dried at 50°C for 8 hours. Afterwards, take it out and grind it with a mortar until there is no grain feeling, and obtain the metal-organic framework material ZIF-8.

[0077] Weigh 2 mg of KOH and dissolve it in water to prepare an alkaline solution with a pH value of about 8.5, and take 400 mL for use. Then, weigh 0.6g ZIF-8 powder and disperse in 100mL H 2 O, then 1.6 g of dopamine hydrochloride ...

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Abstract

The invention provides a selective oxygen-permeable membrane and its preparation method and application, belonging to the field of air batteries. The present invention disperses ZIF-8 coated with thin-layer polydopamine in a matrix containing PMMA, and utilizes 3D printing to obtain a mixed matrix film; the amino group in ZIF-8 is to CO 2 It has a strong adsorption effect; the polydopamine coating can reduce the gap between the MOF particles and the polymer matrix PMMA, and promote the fixation of the MOF particles in the matrix membrane, and the abundant ‑OH groups in polydopamine and CO 2 Molecules also have strong interactions; the PMMA matrix is ​​rich in ‑C=O, for CO 2 It has a repelling effect and is also a hydrophobic material, which can prevent the battery from being poisoned by water vapor in the air; the prepared selective oxygen-permeable membrane is resistant to CO 2 Has preferential adsorption properties, while the adsorption capacity for oxygen is significantly lower than CO 2 , can be used as a porous waterproof and breathable layer material that is easy to process, has the functions of blocking carbon dioxide and oxygen permeability.

Description

technical field [0001] The invention relates to the technical field of air batteries, in particular to a selective oxygen-permeable membrane and its preparation method and application. Background technique [0002] Metal-air batteries will be a new generation of green primary batteries that can replace traditional batteries in the future. With the progress of the new era and economic development, the demand for energy is essential to us, so there is an urgent need for renewable energy. Appear. Lithium-ion batteries have been commercialized for the first time mainly in small electronic devices due to their advantages such as high energy density and long life. However, since the charging and discharging reaction process of the lithium-ion battery system is the insertion and extraction of lithium ions between the positive and negative electrodes, the lithium ions in the battery cannot fully participate in the reaction during this process, and thus cannot meet the high requirem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01D53/02H01M12/06
CPCB01J20/261B01J20/223B01J20/28033B01D53/02H01M12/06
Inventor 卢惠民刘建学
Owner 易航时代(北京)科技有限公司
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