Self-assembled layers composite membrane and preparation and application thereof

A self-assembled layer and composite membrane technology, which is applied in the direction of layered products, battery components, chemical instruments and methods, etc., can solve the problem of difficult balance between selectivity and proton conductivity, and achieve the controllable number of self-assembled layers, Aperture adjustable to achieve the effect of efficiency

Active Publication Date: 2014-11-12
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, it is difficult to balance the selectivity and proton conductivity of porous membranes for hydrogen ions and vanadium ions, so it is of great significance to improve the selectivity and ion conductivity of porous membranes, and then realize their large-scale application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dissolve 8 grams of polyethersulfone and 2 grams of sulfonated polyetheretherketone in 20ml of DMAC, stir for 8 hours, and spread the resulting polymer solution on a glass plate, then quickly immerse in 5L of water, solidify, and form a porous diaphragm with a film thickness is 130 μm.

[0037] Soak the prepared porous diaphragm in methanol for 20 minutes, take it out and immerse it in 2wt% polydipropylene dimethyl ammonium chloride (PDDA) aqueous solution for 20 minutes, take it out and rinse it with deionized water; then the membrane Soak in methanol for 20 minutes, take it out and immerse it in 2wt% polyacrylic acid (PAA) aqueous solution for 20 minutes, take it out and rinse it with deionized water; after that, soak it alternately in the above PDDA and PAA solution in the same way to obtain self-assembled A porous composite membrane with 9 layers.

[0038] The all-vanadium redox flow battery energy storage battery is assembled by using the prepared porous composite...

Embodiment 2

[0040] As in Example 1, a porous composite membrane with three self-assembled layers was prepared. The assembled flow battery has a current efficiency of 85.5%, a voltage efficiency of 83.0%, and an energy efficiency of 71.0%.

Embodiment 3

[0042] The preparation method of the porous composite membrane is the same as in Example 1, but the battery is directly assembled without layer-by-layer self-assembly. The assembled flow battery has a current efficiency of 76.0%, a voltage efficiency of 83.5%, and an energy efficiency of 63.5%.

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PUM

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Abstract

The invention relates to a self-assembled layers composite membrane. According to preparation of the composite membrane, a porous membrane prepared by using one or more than two of organic polymer resins or sulfonated organic polymer resins as raw materials is used as a matrix; the matrix undergoes swelling by the use of a swelling agent; and the cationic and anion polymer resins are self-assembled through electrostatic attraction on the surface of the matrix and are successively alternately arranged so as to prepare the self-assembled layers composite membrane. The number of the self-assembled layers is 1-60, and each self-assembled layer is composed of a single-layer cationic resin assembly layer or a single-layer anion resin assembly layer. In comparison with an original porous membrane, the composite membrane has advantages as follows: on the basis of maintaining ionic conductivity of the porous membrane, selectivity of hydrogen ion and vanadium ion is raised; and a battery assembled by the use of the composite membrane has higher efficiency.

Description

technical field [0001] The invention relates to a composite membrane material for a liquid flow energy storage battery, in particular to a layer-by-layer self-assembled composite membrane and its application in an all-vanadium flow energy storage battery. Background technique [0002] Liquid flow energy storage battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, large storage capacity, free location selection, deep discharge, safety and environmental protection, and maintenance. With the advantages of low cost, it can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. Vanadium flow battery (Vanadium flow battery, VFB) is considered to have a good application prospect due to its advantages of high safety, good s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B27/08C08J9/42C08J9/28
CPCC08J9/42C08J2381/06H01M8/0239H01M8/0245Y02E60/50
Inventor 李先锋张华民徐万兴曹静玉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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