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Composite film for flow energy storage battery and application thereof

A liquid flow energy storage battery and composite membrane technology, which is applied to battery pack components, fuel cell components, circuits, etc., can solve problems such as limiting hydrogen ion transmission, achieve good comprehensive performance, improve ion selection ability, and prepare Process clean and environmentally friendly

Inactive Publication Date: 2013-01-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The blocking of vanadium ions and the selective permeation of hydrogen ions by porous membranes are realized through the regulation of the pore size of the membrane, but too small pore size will limit the transmission of hydrogen ions, so there is an optimal value for the regulation of pore size

Method used

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  • Composite film for flow energy storage battery and application thereof
  • Composite film for flow energy storage battery and application thereof
  • Composite film for flow energy storage battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve 7.5 grams of polyacrylonitrile in 50ml of DMSO, stir for 5 hours, spread the polymer solution on a glass plate, then quickly immerse in 5L of water, solidify, and form a porous membrane. The prepared porous membrane is soaked in deionized water 1 hour.

[0038] The porous membrane prepared by the above steps is placed in 0.5wt.% polydipropylene dimethyl ammonium chloride (PDDA) aqueous solution, left to stand for 5 minutes, taken out and rinsed with deionized water; then the membrane is placed in 0.5wt.% sulfonated polyether ether ketone (SPEEK) aqueous solution, let it stand for 5 minutes, take it out and rinse it with deionized water; after that, soak it in the above-mentioned PDDA and SPEEK solution alternately for 4 times in the same way to obtain the self- The self-assembled layer with 12 assembled layers is composited with a porous film.

[0039] The all-vanadium flow energy storage battery is assembled by using the prepared self-assembled layer composit...

Embodiment 2

[0041]The preparation method of the self-assembled composite porous film is the same as in Example 1, and the number of self-assembled layers is 20, and the battery is assembled with the composite film. Other assembly conditions and test conditions are the same as in Example 1. The battery Coulombic efficiency is 87.0%, the voltage efficiency is 83.3%, and the energy efficiency is 72.5%. The self-discharge time was 32.0 hours.

Embodiment 3

[0048] The SPEEK solution in Example 1 was replaced with a sulfonated polysulfone (SPU) solution, and a composite porous membrane with 30 self-assembled layers was prepared by the same preparation method, so as to assemble a battery. Other assembly conditions and test conditions are the same as in Example 1. The battery Coulombic efficiency is 88.3%, the voltage efficiency is 81.4%, and the energy efficiency is 71.9%. The self-discharge time was 38.3 hours.

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Abstract

The invention discloses a composite film for a flow energy storage battery and an application of the composite film in the flow energy storage battery. The composite film disclosed herein is characterized by using one or more than two of organic polymer resin or sulfonated polymer resin as raw material to prepare a porous film as a matrix, and successively alternately self-assembling cationic polymer resin and anion polymer resin layer by layer on the surface of the matrix by static electricity to form the composite film. The composite film disclosed herein has the advantages of simple preparation method, environmentally friendly process, controllable number of assembling layers, and adjustable ionic selectivity. Compared with original porous films, the composite film disclosed herein has good hydrophilicity and vanadium ion blocking ability, and an all vanadium flow energy storage battery assembled by using the composite film has higher efficiency and longer self-discharge time.

Description

technical field [0001] The invention relates to a composite membrane material for a liquid flow energy storage battery, in particular to a self-assembled layer composite porous membrane and its application in a liquid 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 redox battery (VRB) is considered to have good application prospects due to its advantages of high safety, good stability, high efficiency, long ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M8/02B32B27/32
CPCY02E60/12Y02E60/50
Inventor 张华民李先锋麦振声张洪章魏文平王晓丽
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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