Hydrotalcite in-situ growth composite membrane, and preparation method and application thereof

An in-situ growth and hydrotalcite technology, applied in electrochemical generators, regenerative fuel cells, fuel cells, etc., can solve the problems of reduced proton conductivity, battery performance attenuation, poor selectivity, etc., to improve selectivity, Effect of improving battery performance, excellent mechanical properties and chemical stability

Inactive Publication Date: 2021-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a big bottleneck in commercial separators, and it is urgent to develop new porous ion-conducting membranes.
[0004] In recent years, porous ion-exchange membranes have been applied in flow batteries due to their adjustable pore size and low cost. However, compared with dense membranes, porous membranes have limited Due to the poor selectivity, the problem of electrolyte interlinkage is serious, which leads to the obvious problem of battery performance attenuation.
For porous ion-conducting membranes, the smaller the pore size, the better the ion selectivity, but the lower the proton conductivity. How to solve the balance between the selectivity and conductivity of porous ion-conducting membranes has become a key bottleneck technology

Method used

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  • Hydrotalcite in-situ growth composite membrane, and preparation method and application thereof
  • Hydrotalcite in-situ growth composite membrane, and preparation method and application thereof
  • Hydrotalcite in-situ growth composite membrane, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Using polyethersulfone PES / SPEEK resin as the base material, dissolve PES / SPEEK in DMAC solvent with a mass ratio of 4:1 to obtain a blend solution with a solid content of 35%, stir it evenly, and pour it on a clean and flat glass On the board, under the condition of 20% humidity, use a 200 μm scraper to scrape out a flat diaphragm, immerse it in water, wait for the solvent to dissolve, and remove the solvent to obtain a PES / SPEEK porous base membrane (porous ion-conducting membrane), soak in water for later use.

[0069] Soak the PES / SPEEK porous base membrane obtained above in 50mL of 0.6mol / L MgCl 2 and 0.3mol / LAlCl 3 12h in the mixed salt solution to ensure that the SO in the diaphragm 3- Fully interact with the metal ions in the salt solution, then configure 40mL alkali solution containing 0.45mol / L NaOH, add it into the above-mentioned salt solution containing the basement membrane under stirring, stir for 10 minutes, and then transfer to a Teflon-lined In a sta...

Embodiment 2

[0078] Using polyethersulfone PES / SPEEK resin as the base material, dissolve PES / SPEEK in DMAC solvent with a mass ratio of 2:1 to obtain a blended solution with a solid content of 35%, stir it evenly and let it stand, pour it on a clean and flat glass On the board, under the condition of 20% humidity, use a 200 μm spatula to scrape out a flat diaphragm, immerse in water, wait for the solvent to dissolve, remove the solvent to obtain a polyethersulfone porous ion-conducting membrane, and soak in water for later use. The growth conditions and subsequent drying process of the hydrotalcite film were the same as in Example 1, and finally a hydrotalcite in-situ growth composite film (referred to as LDHM-2) with a layer spacing of 0.76 nm and a porosity of 35% was obtained. The thickness of the hydrotalcite layer is 1.54 μm, the total thickness of the composite membrane is 114 μm, the pore diameter of the polyethersulfone porous ion-conducting membrane is 0.5-50 nm, and the porosity ...

Embodiment 3

[0085] Using polyethersulfone PES / SPEEK resin as the base material, dissolve PES / SPEEK in DMAC solvent with a mass ratio of 1:1 to obtain a blended solution with a solid content of 35%, stir it evenly and let it stand, pour it on a clean and flat glass On the board, under the condition of 20% humidity, use a 200 μm spatula to scrape out a flat diaphragm, immerse in water, wait for the solvent to dissolve, remove the solvent to obtain a polyethersulfone porous ion-conducting membrane, and soak in water for later use. The growth conditions and subsequent drying process of the hydrotalcite film were consistent with those in Example 1, and finally a hydrotalcite in-situ growth composite film (referred to as LDHM-3) with a hydrotalcite layer spacing of 0.76 nm and a porosity of 30% was obtained. The thickness of the hydrotalcite layer is 1.56 μm, the total thickness of the composite membrane is 116 μm, the pore diameter of the polyethersulfone porous ion-conducting membrane is 0.5-5...

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Abstract

The invention discloses a hydrotalcite in-situ growth composite membrane, and a preparation method and application thereof, and belongs to the field of alkaline and neutral group secondary batteries. The hydrotalcite in-situ growth composite membrane comprises an ion conduction membrane substrate and a hydrotalcite layer grown on the ion conduction membrane in situ. By effectively controlling hydrotalcite synthesis conditions and interface interaction, the distribution uniformity of the synthesized hydrotalcite layer can be effectively controlled, and accurate size screening and high-efficiency ionic conductivity of the porous ionic conduction membrane are realized. In addition, the in-situ growth hydrotalcite film has super-strong alkali-resistant stability and mechanical properties, so that the alkaline zinc-based flow battery with high performance and long service life is realized, and a good application prospect is shown.

Description

technical field [0001] The present application relates to the field of alkaline and neutral base secondary batteries, in particular to a hydrotalcite in-situ growth composite film and its preparation method and application. Background technique [0002] The impact of increasing energy consumption, especially the massive use of fossil fuels such as coal and oil, on the environment and global climate has made the goal of sustainable development of human beings face serious threats. Therefore, the research and development of new energy and renewable energy and the search for advanced methods to improve energy utilization have become the primary issue of global concern. Energy storage technology is a key supporting technology for the energy revolution. Flow battery is a promising battery technology in the field of large-scale energy storage, which has the advantages of high safety, independent design of output power and energy storage capacity, and environmental friendliness. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M8/0239H01M8/0241
CPCH01M8/0239H01M8/0241H01M8/188Y02E60/50
Inventor 袁治章李先锋胡静张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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