Application of an Alkaline Porous Membrane in Flow Energy Storage Batteries

A liquid flow energy storage battery and porous membrane technology, which is applied to fuel cell parts, fuel cells, battery pack parts, etc., can solve the problems of high price, poor ion selectivity, and limited membrane industrial application, and achieve low cost , high conductivity, and the effect of improving ion selective permeability

Active Publication Date: 2016-08-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The membrane materials currently used at home and abroad are mainly Nafion membranes developed by DuPont of the United States. Nafion membranes have excellent performance in terms of electrochemical performance and service life, but due to their high price, they are especially used in all-vanadium flow energy storage batteries. There are disadvantages such as poor ion selectivity, which limits the industrial application of the membrane

Method used

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  • Application of an Alkaline Porous Membrane in Flow Energy Storage Batteries
  • Application of an Alkaline Porous Membrane in Flow Energy Storage Batteries
  • Application of an Alkaline Porous Membrane in Flow Energy Storage Batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 2g of chloromethyl polysulfone (the degree of chloromethylation is 135mmol / g) is dissolved in 8g of DMAC, stirred for 5 hours, and the polymer solution formed is spread on the surface of a glass plate, and scraped into a thickness of 250um under normal temperature and pressure. liquid film. After 10 seconds, place the glass plate together with the liquid film in a constant temperature and humidity chamber at 50°C with a humidity of 80%, and take it out after 5 minutes to form a porous diaphragm.

[0039] The prepared porous diaphragm was soaked in deionized water for 24 hours, and then immersed in a solution of pyridine:water=1:3 (volume ratio) for 12 hours. Afterwards, the porous membrane was washed with deionized water, and immersed in 3mol / L sulfuric acid aqueous solution for 1 hour to obtain a porous composite membrane. The cross section and surface structure of the membrane were as follows: Figure 4 , 5 shown. Depend on Figure 4 , 5 It can be seen that the e...

Embodiment 2

[0045] 1g of chloromethyl polysulfone (the degree of chloromethylation is 135mmol / g) is blended with 1g of ordinary polysulfone, dissolved in 8g of DMAC, stirred for 24 hours, and the resulting polymer solution is spread on the surface of a glass plate and kept at room temperature. Press down and scrape into a liquid film with a thickness of 250um. After 10 seconds, place the glass plate together with the liquid film in a constant temperature and humidity chamber at 50°C with a humidity of 80%, and take it out after 5 minutes to form a porous diaphragm.

[0046] The prepared porous diaphragm was soaked in deionized water for 24 hours, and then immersed in a solution of pyridine:water=1:9 (volume ratio) for 24 hours. Afterwards, the porous membrane was washed with deionized water, and immersed in 3 mol / L sulfuric acid aqueous solution for 24 hours.

[0047] The all-vanadium flow energy storage battery is assembled by using the prepared porous membrane, in which the catalytic l...

Embodiment 3

[0049] 1g of bromomethylated polysulfone (the degree of bromomethylation is 100mmol / g) was stirred for 15 hours, and the formed polymer solution was spread on the surface of a glass plate, and then quickly immersed in 5L of water to solidify to form a porous diaphragm.

[0050] The prepared porous diaphragm was soaked in deionized water for 24 hours, and then immersed in a solution of imidazole:water=1:3 (volume ratio) for 24 hours. Afterwards, the porous membrane is washed with deionized water and immersed in 3 mol / L sulfuric acid aqueous solution for 24 hours to obtain an alkaline porous membrane containing imidazole groups.

[0051] The all-vanadium flow energy storage battery is assembled by using the prepared porous membrane, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the effective area of ​​the membrane is 9cm -2 , the current density is 160, 140, 120, 80, 60, 40mAcm -2 , the vanadium ion concentration in the electrol...

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Abstract

The invention relates to an application of an alkaline porous membrane in a liquid flow energy storage battery. The alkaline porous membrane is based on a polyaromatic resin containing chloromethyl or bromomethyl groups, and can be combined with other resins. It is prepared by blending and finally grafting basic groups on the chloromethyl or bromomethyl groups of the matrix; wherein the content of the matrix in the blended resin is 5-100 wt%. The alkaline porous membrane has simple preparation method, controllable pore size, adjustable alkaline group content, and easy realization of mass production. The preparation of the alkaline porous membrane effectively improves the ionic conductivity of the separator, and effectively prevents the permeation of vanadium ions through electrostatic repulsion, which greatly improves the energy conversion efficiency of the all-vanadium redox flow battery.

Description

technical field [0001] The invention relates to a polymer electrolyte diaphragm material for a liquid flow energy storage battery, in particular to the application of a porous membrane grafted with ion exchange groups 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, smart grid and power system peak shaving and valley filling. Vanadium flow battery (Vanadium flow battery, VFB) is considered to be the most promising liquid flow energy storage battery due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M8/0239C08J7/12C08J5/22C08L81/06C08L27/16C08L61/16H01M8/028H01M8/0284H01M50/414
CPCH01M8/0289C08J5/2237C08J5/2256C08J5/2287C08J2461/16C08J2481/06C08J2381/06C08J2327/16Y02E60/50
Inventor 张华民张洪章李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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