A composite ion-exchange membrane and a preparation method thereof, and a redox flow battery

Abstract

The present invention discloses a composite ion-exchange membrane and a preparation method thereof, and a redox flow battery. The composite ion-exchange membrane is prepared by using a sulfonated polymer as a matrix, incorporating inorganic materials into the matrix, and mixing the sulfonated polymer and the inorganic materials uniformly. The ion-exchange capacity of the sulfonated polymer is 0.1-5mmol / g, the mass percentage of the sulfonated polymer is 80-99.99wt%, the mass percentage of the inorganic materials is 0.01-20wt%, and the mass percentagesof the sulphonated polymer and the inorganic materials sum to 100wt%. According to the present invention, by introducing a certain amount of inorganic materials into a certain amount of the sulfonated polymer matrix for modification, the composite ion-exchange membrane is allowed to both have a high ionic selectivity and a high stability. By applying the prepared composite ion-exchange membrane in the redox flow cell, higher battery efficiency and more stable battery performance can be achieved. The preparation method of the composite ion-exchange membrane is simple and is conducive to promoting the industrial development of redox flow batteries.

Description

technical field [0001] The invention relates to an ion exchange membrane in a liquid flow battery, in particular to a composite ion exchange membrane, a preparation method thereof, and a flow battery comprising the composite ion exchange membrane. Background technique [0002] As a kind of energy storage technology that has attracted much attention and the fastest development, redox flow battery has the advantages of large storage capacity, long cycle life, safety and pollution-free, free location selection, fast charging and deep discharge, etc. , It is expected to be widely used in renewable energy power generation and energy storage, power grid peak regulation, smart grid, uninterruptible power supply, etc. The vanadium redox flow battery (VRB or vanadium battery for short) has the advantages of high energy conversion efficiency, simple structure, flexible system design (power and capacity), and low maintenance costs, and is considered to be the easiest to achieve large-s...

AI Technical Summary

Problems solved by technology

Among them, the first membrane, Nafion membrane, has the advantages of good electrochemical performance, high stability, and long life, but its disadvantages are high price and high permeability of active materials, which leads to low battery efficiency when it is used in flow batteries. Low

The second membrane, the SPEEK membrane, has high ion selectivity and low cost, so when it is used in a flow battery, the efficiency of the flow battery is high, but the disadvantage is that its mechanical strength and stability are poor, resulting in a short battery life.

It can be seen that the first membrane has high stability but poor ion selectivity, while the second membrane has high ion selectivity but poor stability

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