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Application of porous separating membrane in zinc-bromine flow battery

A zinc-bromine flow battery and separation membrane technology, which is applied in the direction of regenerative fuel cells, battery pack components, circuits, etc., can solve the problems of limiting the industrial application of membranes, high price, etc., and achieve mass production, simple preparation method, Avoiding the effect of reducing the oxidative stability of the polymer

Inactive Publication Date: 2016-07-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the membrane materials used in zinc-bromine flow batteries at home and abroad are mainly Nafion membranes and porous membranes developed by DuPont of the United States. Nafion membranes have excellent performance in terms of electrochemical performance and service life, but they are expensive because of their high price. Industrial applications of membranes

Method used

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  • Application of porous separating membrane in zinc-bromine flow battery
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Examples

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Embodiment 1

[0024] 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, and solidify for 5 minutes to form a porous separation membrane. figure 2 A cross-sectional SEM picture of the prepared membrane material is given, showing a regular pore structure. The zinc-bromine flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 20mAcm -2 , the concentration of zinc bromide in the electrolyte is 2.0M. The assembled flow battery has a current efficiency of 68%, a voltage efficiency of 93%, and an energy efficiency of 63%.

Embodiment 2

[0026] Dissolve 7.5g of polyacrylonitrile in 30mlDMSO+20mlTHF, stir for 5 hours, and spread the resulting polymer solution on a glass plate, volatilize for 10s, then quickly immerse in 5L of water, and solidify for 10 minutes to form a porous separation membrane.

[0027] The zinc-bromine flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 20mAcm -2 , the concentration of zinc bromide in the electrolyte is 2.0M. The assembled flow battery has a current efficiency of 79%, a voltage efficiency of 87%, and an energy efficiency of 69%.

Embodiment 3

[0029] Dissolve 7.5g of polyacrylonitrile in 30mlDMSO+10mlTHF, stir for 5 hours, spread the resulting polymer solution on a glass plate, volatilize for 20s, then quickly immerse in 5L of water, solidify for 10 minutes, and form a porous separation membrane.

[0030] The zinc-bromine flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 20mAcm -2 , the concentration of zinc bromide in the electrolyte is 2.0M. The assembled flow battery has a current efficiency of 91%, a voltage efficiency of 82%, and an energy efficiency of 75%.

[0031] Through embodiment 1~3 battery performance figure 2 The comparison shows that as the membrane pore size decreases, the coulombic efficiency of the battery increases, the voltage efficiency remains at the same level, and the energy efficiency also increa...

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Abstract

The invention discloses an application of a porous separating membrane in a zinc-bromine flow battery. The porous separating membrane is prepared from more than one or two of polysulfone, polyketone, polyimide, polybenzimidazole, polyvinylidene fluoride, polyvinyl pyridine, polyacrylonitrile, polypropylene, polyethylene, polybutadiene or cellulose acetate; the aperture sizes in the porous separating membrane are 0.05-20nm; and the porosity is 20%-60%. The prepared membrane material can effectively achieve separation of different zinc ions and keep the ion selectivity of the membrane. Furthermore, the membrane material can achieve ion transport without introducing an ion exchange group; and the selection range of the flow battery membrane material is expanded.

Description

technical field [0001] The invention relates to the application of a class of porous separation membranes in zinc-bromine liquid flow batteries. Background technique [0002] Zinc-bromine flow 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 site 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. [0003] The diaphragm is an important part of the zinc-bromine flow battery, which plays a role in blocking the positive and negative electrolytes and providing proton transport channels. The proton conductivity, chemical stability and ion selectivity of the membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M8/18
CPCY02E60/50
Inventor 李先锋张华民赖勤志段寅琦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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