Application of hydrophilic-modified porous diaphragm in flow battery

A porous diaphragm and flow battery technology, applied in the field of hydrophilic modified porous diaphragm, can solve the problem of reducing the pore size, achieve the effect of improving ion selectivity, easy mass production, and realizing controllability

Active Publication Date: 2016-01-06
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

[0007] The purpose of the present invention is to solve the problems existing in the existing ion-exchange membranes for flow batteries, and to provide a hydrophilic porous membrane for flow batteries. By introducing a hydrophilic polymer into the pores of the porous membrane, it can not only effectively improve the porous Electrolyte wettability of the separator, and the ability to further reduce the pore size

Method used

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  • Application of hydrophilic-modified porous diaphragm in flow battery
  • Application of hydrophilic-modified porous diaphragm in flow battery
  • Application of hydrophilic-modified porous diaphragm in flow battery

Examples

Experimental program
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Embodiment 1

[0043]Dissolve 7.5g of polyvinylidene fluoride powder in 34g of dimethylacetamide to form a uniform transparent solution, use water as a coagulation bath, use an automatic coating machine to scrape coat, control the film thickness at about 120um, put the prepared PVDF film Store in water for later use. Before the modification reaction, soak the membrane in ethanol for 2 hours to fully swell the membrane. The specific modification process is as follows: the membrane is immersed in the prepared 4wt% PVP / 0.4wt% K2S2O8 aqueous solution for 2 hours, and the membrane pores and The ethanol on the surface of the membrane is replaced, and then the membrane is put into a container of PVP reaction solution (4wt% PVP) and sealed, and the oil bath is heated to 96° C., and the PVP is cross-linked and grafted on the PVDF membrane at high temperature. The reaction time was controlled to be 2h, and the modified PVDF membrane was obtained. After the reaction, the membrane was taken out and boi...

Embodiment 2

[0049] Embodiment 2: other conditions are the same as embodiment 1, and the swelling agent is changed to methanol.

Embodiment 3

[0050] Embodiment 3: other conditions are the same as embodiment 1, and the swelling agent is changed into isopropanol.

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Abstract

The invention relates to an application of a hydrophilic-modified porous diaphragm in a flow battery. With a polyvinylidene fluoride porous diaphragm as a matrix, a hydrophilic polymer is introduced to the surface and holes of the porous diaphragm; and the hydrophilic polymer is subjected to self-crosslinking and grafting on the surface and the holes of the porous diaphragm, so as to obtain the hydrophilic polymer-crosslinked and grafted porous diaphragm. The porous diaphragm is simple in terms of the preparation method and controllable in aperture; mass production is easy to achieve; and according to the prepared hydrophilic-modified porous diaphragm, the wettability of electrolyte on the diaphragm and the ionic conductivity can be effectively improved.

Description

technical field [0001] The invention relates to a polymer porous diaphragm material for a liquid flow battery, in particular to a hydrophilized modified porous diaphragm and an application thereof. Background technique [0002] With its advantages of low cost, high efficiency, modular design, safety and environmental protection, etc., flow batteries have shown extremely good application prospects in the fields of wind power generation, photovoltaic power generation, power grid peak shaving and valley filling, distributed power stations, and smart grids. Vanadium flow battery (Vanadium flow battery, VFB) is currently the most promising and representative flow battery among flow batteries due to its environmental friendliness, high charge and discharge efficiency, high safety, and good stability. Close to the industrialized liquid flow battery. [0003] The battery separator is the key material of the all-vanadium redox flow battery. It plays the role of blocking the positive...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 李先锋张华民曹静玉段寅琦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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