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Sulfonated polyetheretherketone-based blended ion exchange membrane for flow batteries and preparation method thereof

A technology of sulfonated polyether ether ketone and ion exchange membrane, applied in the field of ion exchange membrane, can solve the problems of decreased mechanical properties, high vanadium ion permeability, unfavorable application, etc., to prolong life, improve thermal and chemical stability , the effect of uniform nature

Active Publication Date: 2015-11-18
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When SPEEK is applied in an all-vanadium redox flow battery, its degree of sulfonation (DS) is usually high, but it will lead to higher vanadium ion permeability and lower mechanical properties of the SPEEK membrane, which is not conducive to application.

Method used

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  • Sulfonated polyetheretherketone-based blended ion exchange membrane for flow batteries and preparation method thereof
  • Sulfonated polyetheretherketone-based blended ion exchange membrane for flow batteries and preparation method thereof
  • Sulfonated polyetheretherketone-based blended ion exchange membrane for flow batteries and preparation method thereof

Examples

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preparation example Construction

[0053] In some embodiments, there is also provided a method for manufacturing a flow battery, including the steps of using the preparation method to prepare a sulfonated polyether ether ketone-based blended ion exchange membrane for a flow battery and using the flow battery Steps for assembling a battery with a sulfonated polyetheretherketone-based blended ion-exchange membrane.

[0054] The following exemplifies the preparation method of the sulfonated polyetheretherketone-based blended ion-exchange membrane for the flow battery and the preferred examples of the prepared ion-exchange membrane, and the application of the prepared ion-exchange membrane to the flow battery performance and advantages.

example 1

[0056] (1) Add 25g of polyetheretherketone dried in vacuum at 80°C for 12 hours to 250mL of concentrated sulfuric acid with a mass percentage of 95~98wt% (the mass volume ratio is 0.1gmL -1 ), sulfonated at 50°C for 6 hours, the product was dissolved in 25mLmin -1 Add it into a stirring ice-water bath at a high speed, wash 6~7 times until the pH of the washing solution is 6~7, filter the sulfonated product under reduced pressure, and dry it at 80°C for 12 hours to obtain a sulfonated product with a sulfonation degree of 73%. Polyetheretherketone.

[0057] (2) The sulfonated polyetheretherketone prepared in step (1) is 85wt% by mass and the polyvinylidene fluoride is 15wt% by mass (the total mass of sulfonated polyetheretherketone and polyvinylidene fluoride is 1.5g) Add it to 10mL of N,N-dimethylformamide, stir well at 25°C for 12 hours to make a blend solution; remove bubbles and impurities from the blend solution, and cast it on a horizontal clean glass plate Membranes wer...

example 2

[0060] The preparation method of the sulfonated polyetheretherketone-polyvinylidene fluoride blended ion-exchange membrane of this example is the same as example 1, and the polyylidene fluoride in the prepared sulfonated polyetheretherketone-polyvinylidene fluoride blended ion-exchange membrane The ethylene content is 10 wt%, and the thickness of the blended ion exchange membrane is 75 μm. A single cell of an all-vanadium redox flow battery was assembled with this blended ion-exchange membrane, and other assembly conditions and test conditions were the same as in Example 1 (excluding cycle charge-discharge life test). The Coulombic efficiency of the single cell is 97.0%, the voltage efficiency is 82.4%, and the energy efficiency is 79.9%.

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Abstract

The invention discloses a sulfonated polyether ether ketone-based blend ion exchange membrane for a flow battery, and a preparation method of the sulfonated polyether ether ketone-based blend ion exchange membrane; the ion exchange membrane takes sulfonated polyether ether ketone as a substrate, and is prepared by adding at least one partly-fluorinated high polymer material into the substrate and evenly blending. The invention also discloses the flow battery using the sulfonated polyether ether ketone-based blend ion exchange membrane, and a preparation method of the flow battery. The ion exchange membrane has low active substance permeability and high heat stability and high chemical stability, and effectively improves the performances of the applied flow battery.

Description

technical field [0001] The invention relates to an ion-exchange membrane for a flow battery, in particular to a sulfonated polyetheretherketone-based blended ion-exchange membrane for a flow battery, its preparation method and its application in a flow battery. Background technique [0002] Redox flow battery is a new type of electrochemical energy storage technology with high energy conversion efficiency, simple structure, flexible system design (power and capacity), large storage capacity, fast charging, 100% deep discharge, Safety and pollution-free, free site selection, long service life, low maintenance costs, etc., can be widely used in wind energy, solar energy, small hydropower stations and other renewable energy generation and energy storage, power system peak shaving and valley filling, uninterruptible power supply, smart grid, Green power supply and so on. Vanadium redox flow battery (Vanadium redox flow battery, referred to as VRB or vanadium battery) has more p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M2/16C08J5/22C08L71/08H01M8/18
CPCY02E60/50Y02P70/50
Inventor 席靖宇李钊华武增华邱新平
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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