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Ultrahigh-mechanical-strength ultrathin film for flow battery as well as preparation and application of ultrathin film

A liquid flow battery and liquid phase technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of low conductivity and poor selectivity of all-vanadium redox flow battery membranes, and achieve high energy efficiency, morphology and performance Controllable adjustment, obvious performance effect

Active Publication Date: 2022-06-03
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

[0004] The purpose of the present invention is to solve the problems of poor membrane selectivity and low conductivity of all-vanadium redox flow batteries, and provide a diffusion-reaction-induced phase inversion method to prepare ultra-thin films, using diffusion-reaction-induced phase inversion method polymers and crosslinking agents A cross-linking reaction occurs between them, and the membrane is connected by a covalent bond, so that the membrane has good chemical stability and ultra-high mechanical strength

Method used

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  • Ultrahigh-mechanical-strength ultrathin film for flow battery as well as preparation and application of ultrathin film
  • Ultrahigh-mechanical-strength ultrathin film for flow battery as well as preparation and application of ultrathin film
  • Ultrahigh-mechanical-strength ultrathin film for flow battery as well as preparation and application of ultrathin film

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The ion-conducting membrane is prepared by the following process:

[0039] (1) Dissolve PBI in DMAc, stir well at 20°C for 24 hours to make a uniform blend solution, and then stand at room temperature for 24 hours to remove air bubbles in the blend solution; the PBI concentration is 15wt%.

[0040] (2) Pour the blended solution prepared in step (1) on one side of the flat plate, volatilize the solvent for 10 s, use a 10 μm spatula to scrape on the flat plate, and then immerse it at 20°C until it contains 1,3,5-benzenetrimethyl. In the n-heptane solution of acid chloride for 10s, every 100 mL of n-heptane contains 0.01 g of 1,3,5-benzenetricarbonyl chloride; then transferred to water to cure to form a film. The formed film is an ultra-thin and dense film with a double-layer structure of a cross-linked layer and a support layer, the thickness of the cross-linked layer is 100 nm, and the film thickness is 2 μm.

Embodiment 2-13

[0042] Change the parameters in Table 1 below, and other conditions are the same as in Example 1.

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Abstract

The invention relates to an ultra-high mechanical strength ultrathin film for a flow battery and preparation and application thereof, and the method comprises the following steps: laying a liquid phase raw material dissolved with resin in a device capable of preparing a planar film, immersing the liquid phase raw material dissolved with resin in a liquid phase system containing a cross-linking agent, and standing to form a film I; the liquid-phase raw material comprises a good solvent of resin; the liquid phase system comprises a poor solvent A of the resin; transferring the film I into a poor solvent A or a poor solvent B of the resin, and standing to obtain a composite film comprising the film I and a film II; and stripping the membrane II to obtain the ion conduction membrane. The membrane has ultrahigh mechanical strength, the preparation method of the membrane is simple, the process is environment-friendly, the chemical stability is good, the ion selectivity is excellent, and the ion conductivity is good. The ultrathin film is beneficial to reducing the internal resistance of the film, and is expected to further improve the ion conductivity of the film while maintaining the high ion selectivity of the film.

Description

technical field [0001] The invention relates to the research field of liquid flow batteries, in particular to the application of an ultra-high mechanical strength ultra-thin film in liquid flow batteries. Background technique [0002] Flow battery is a large-scale electrochemical energy storage technology, which has the advantages of long cycle life, high safety, independent power and capacity, etc. large-scale application. Among them, all-vanadium flow battery (VFB) energy storage technology has become the preferred technology for large-scale high-efficiency energy storage due to its high safety, long life, large output power and energy storage capacity, good charge-discharge cycle performance and environmental friendliness. one. [0003] Membrane is one of the key materials of VFB, which plays the role of blocking the cross-blending of vanadium ions in the positive and negative electrolytes, while transferring hydrogen ions to form a battery circuit, and its performance ...

Claims

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Application Information

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IPC IPC(8): C08J5/22H01M8/0239H01M8/18C08L79/04
CPCC08J5/2256H01M8/0239H01M8/188H01M2300/0082C08J2379/04Y02P70/50Y02E60/50
Inventor 李先锋石梦奇张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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