Unlock instant, AI-driven research and patent intelligence for your innovation.

Blended ion exchange membrane and application thereof in alkaline system zinc-iron flow battery

An ion-exchange membrane and blending technology, which is applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of limited membrane industrial application, poor ion conductivity, and limited applications, so as to improve battery ion conductivity and increase Anion transport channel, effect of improving battery voltage efficiency

Active Publication Date: 2020-06-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 zinc-iron flow batteries in alkaline systems. However, there are disadvantages such as poor ion conductivity, which limits the industrial application of the membrane.
At the same time, another major type of membrane material commonly used at this stage is the anion exchange membrane. In the alkaline system, the anion exchange membrane has excellent ion conductivity, but its chemical stability is poor, which limits its long-term operation in the battery. Application under conditions
[0004] The currently developed and used anion-exchange membranes for zinc-iron redox flow batteries in alkaline systems, commonly used anion-exchange membranes or composite membranes made of organic polymer resins containing nitrogen functional groups, but the voltage efficiency is generally low, and the normal operation of the battery cannot be guaranteed.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Blended ion exchange membrane and application thereof in alkaline system zinc-iron flow battery
  • Blended ion exchange membrane and application thereof in alkaline system zinc-iron flow battery
  • Blended ion exchange membrane and application thereof in alkaline system zinc-iron flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 15 grams of polyvinylpyrrolidone resin and 7.5 grams of polyethersulfone resin were dissolved in 30ml of DMAc, stirred for 15 hours, and the polymer solution formed was spread on a glass plate with a thickness of 250 μm, and stood on a heating platform at 50°C for 24 hours. A composite ion exchange membrane to be treated is formed. Then soak the composite ion exchange membrane to be treated in 3mol / L sulfuric acid solution, treat it at 50°C for 20 hours, then take it out and dry it in the air to obtain a blended ion exchange membrane.

[0027] The alkaline zinc-iron flow battery was assembled by using the prepared blended ion exchange membrane, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the effective area of ​​the membrane is 48cm 2 , with a current density of 80mA cm -2 , the zincate ion concentration in the electrolyte is 0.5mol / L, the ferrocyanide ion concentration is 1mol / L, and the sodium hydroxide concentration...

Embodiment 2

[0030] Example 2 The organic polymer resin with nitrogen-containing functional groups is selected as polyimide, and other conditions remain unchanged. The assembled alkaline system zinc-iron flow battery has an average Coulomb (CE) of 74.8%, a voltage efficiency (VE) of 85.2%, and an energy efficiency (EE) of 88.0% after 500 cycles. Battery life >1500 cycles.

[0031] Attached table description: adjust the mass ratio of the type of nitrogen-containing organic polymer resin and the two polymer resins, and other conditions are the same as in Example 1

[0032]

[0033] Through the performance results of the above examples and comparative examples, it can be seen that the voltage efficiency of the blended ion exchange membrane prepared by acid treatment is significantly improved. The charge group can combine with the nitrogen-containing functional groups in the polymer compound to make it cross-linked into a three-dimensional network structure. Microscopically, the free volum...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Molar concentrationaaaaaaaaaa
Thicknessaaaaaaaaaa
Effective areaaaaaaaaaaa
Login to View More

Abstract

The invention relates to application of a blended ion exchange membrane in an alkaline zinc-iron flow battery. According to the blended membrane, organic polymer resin containing nitrogen functional groups and soluble organic polymer resin are blended, and the blended resin is subjected to solvent evaporation, so that a blended compact membrane can be prepared; the compact membrane is immersed inan aqueous solution of a bi- or poly inorganic acid so as to be subjected to cross-linking treatment. The composite ion exchange membrane has the characteristics of simple preparation method, environment-friendly process and the like. Compared with an original non-crosslinked composite ion exchange membrane, the composite ion exchange membrane has higher chemical stability, can effectively inhibit the migration problem of an electrolyte solution, prolongs the cycle life of a battery, and improves the performance of the battery.

Description

technical field [0001] The invention relates to the technical field of diaphragms for flow batteries, in particular to the application of an ion exchange membrane in zinc-iron flow batteries. Background technique [0002] Liquid 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 low maintenance costs. 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. Due to the advantages of high safety, good stability, long life (lifetime > 15 years), and low cost, alkaline system zinc-iron flow battery is considered to be a kind of flow battery with high development potential. [0003] The battery separator ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M8/1018H01M8/1044H01M8/1069H01M8/18
CPCH01M8/1018H01M8/1044H01M8/1069H01M8/188Y02E60/50
Inventor 段寅琦李先锋张华民袁治章
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI