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A Zwitterionic Membrane for All Vanadium Redox Flow Batteries

An all-vanadium redox flow battery, zwitterion technology, applied in the field of zwitterionic membranes and polymer membranes, can solve the problems affecting battery performance, vanadium ion penetration, self-discharge, etc., to improve vanadium resistance performance, good conductivity, reduce The effect of vanadium penetration

Active Publication Date: 2021-08-24
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When proton exchange membranes represented by Nafion membranes are used in vanadium batteries, the conductive channels of hydrophilic particle clusters will lead to the penetration of vanadium ions, resulting in serious self-discharge and affecting battery performance.

Method used

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  • A Zwitterionic Membrane for All Vanadium Redox Flow Batteries
  • A Zwitterionic Membrane for All Vanadium Redox Flow Batteries
  • A Zwitterionic Membrane for All Vanadium Redox Flow Batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0019] This embodiment provides a zwitterionic membrane for all-vanadium redox flow battery, which is prepared through the following steps:

[0020] (a) Weigh 7.5g of polyether ether ketone and dissolve it in 150ml of concentrated sulfuric acid. After forming a homogeneous solution (that is, after dissolving evenly), heat it at 40°C for 10 hours, pour the reactant into ice water for precipitation, and wash it several times until Neutral, and finally dried in an oven at 80°C to obtain sulfonated polyether ether ketone, its NMR spectrum is as follows figure 1 Shown; And its general chemical structure formula is:

[0021]

[0022] (b) Weigh 30ml of chlorobenzene and 6.00g of polyphenylene ether into a three-necked flask, protect the temperature with nitrogen to raise the temperature to 135°C, and weigh 1.78g of N-bromosuccinyl respectively after the polyphenylene ether is completely dissolved. Add imine and 0.16g AIBN to the mixture, stir and react at 135°C under nitrogen atm...

Embodiment 2

[0026] This embodiment provides a zwitterionic membrane for an all-vanadium redox flow battery, which is basically the same as that in Example 1, except that 1,2-dimethylimidazole is used in step (b), The general chemical formula of the finally obtained membrane is: Its performance parameters are: water absorption rate at room temperature is 33%, swelling degree is 15%, tensile strength is 16.52MPa, vanadium permeability coefficient is 2.89×10 -8 cm 2 / min, the conductivity at room temperature is 32mS / cm; the membrane is placed in 1.5mol / L VOSO 4 and 3mol / L H 2 SO 4 Soaked in the solution for 72 hours, the measured conductivity is 28mS / cm, which proves that it has good stability.

Embodiment 3

[0028] This embodiment provides a zwitterionic membrane for an all-vanadium redox flow battery, which is basically the same as 1 in the embodiment, except that: 1-ethylimidazole is used in step (b), and sulfonated Polyether ether ketone is blended to prepare a composite membrane, and its general structural formula is: The performance parameters of the finally obtained membrane are: water absorption rate at room temperature is 38%, swelling degree is 16%, tensile strength is 17.86MPa, vanadium permeability coefficient is 3.21×10 -8 cm 2 / min, the conductivity at room temperature is 33mS / cm; the membrane is placed in 1.5mol / L VOSO 4 and 3mol / L H 2 SO 4 Soaked in the solution for 72 hours, the measured conductivity is 31mS / cm, which proves that it has good stability.

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Abstract

The invention relates to a zwitterionic membrane used in an all-vanadium redox flow battery, which is prepared by solution casting and acidification, and the solution casting is pouring a mixed solution containing a first polymer and a second polymer into a mold curing molding, the first polymer is a polymer containing sulfonic acid groups, and the second polymer is a polymer containing N heterocyclic cations or quaternary ammonium cations. By mixing and curing polymers containing sulfonic acid groups and polymers containing N heterocyclic cations or quaternary ammonium cations, not only can effectively reduce vanadium penetration under the Donnan repulsion effect, but also can maintain good Conductivity while improving vanadium resistance performance.

Description

technical field [0001] The invention belongs to the field of all-vanadium redox flow batteries, and relates to a polymer membrane, in particular to an amphoteric ion membrane used for all-vanadium redox flow batteries. Background technique [0002] The rapid development of renewable energy has promoted the development of energy storage technology. Vanadium redoxflow battery (VRB, referred to as vanadium battery) is considered to be one of the most promising battery energy storage systems because of its long cycle life, low impact on the environment, and high energy efficiency. As an essential component of VRB, the ion-exchange membrane not only prevents the positive and negative half-cell electrolytes from mixing with each other, but also provides proton channels for the positive and negative electrolytes. [0003] The proton conductivity, chemical stability and ion selectivity of the membrane will directly affect the electrochemical performance and service life of the batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 储富强储徐烽朱科钤陈乾林本才丁建宁袁宁一
Owner CHANGZHOU UNIV
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