Application of basic porous membrane in liquid flow energy storage battery

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 industrial application of membranes, and achieve low cost , high conductivity, and the effect of improving ion selective permeability

Active Publication Date: 2014-03-26
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 servi

Method used

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  • Application of basic porous membrane in liquid flow energy storage battery
  • Application of basic porous membrane in liquid flow energy storage battery
  • Application of basic porous membrane in liquid flow energy storage battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 2g of chloromethyl polysulfone (the degree of chloromethylation is 135mmol / g) in 8g of DMAC and stir for 5 hours to form a polymer solution that is spread on the surface of a glass plate and scraped to a thickness of 250um under normal temperature and pressure. of 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 entire...

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 Under normal pressure, it is scraped 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 t...

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, 40mA cm -2 , the concentration of vanadium ions in the ele...

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Abstract

The invention relates to application of a basic porous membrane in a liquid flow energy storage battery. According to the basic porous membrane, polyaromatic resin containing chloromethyl or bromomethyl group is used as a matrix and can be blended with other resins, and a basic group is grafted on the chloromethyl or bromomethyl group of the matrix, wherein the content of matrix in the blended resin is 5-100 percent by weight. The basic porous membrane is simple in preparation method, controllable in pore diameter and adjustable in content of basic groups, and large-scale production can be easily realized. According to the basic porous membrane, the ionic conductivity of a diaphragm can be effectively improved, vanadium ion permeation can be effectively prevented due to the action of electrostatic repulsion, and the energy conversion efficiency of a full-vanadium liquid flow battery can be greatly improved.

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 advanced liquid flow energy storage battery due to...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M8/02C08J7/12C08J5/22C08L81/06C08L27/16C08L61/16H01M8/028H01M8/0284H01M50/414
CPCY02E60/50H01M8/0289C08J5/2237C08J5/2256C08J5/2287C08J2461/16C08J2481/06C08J2381/06C08J2327/16
Inventor 张华民张洪章李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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