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Application of Hydrophilic Modified Porous Separators in Flow Batteries

A technology of porous diaphragm and flow battery, which is applied in the field of hydrophilic modified porous diaphragm, which can solve the problems of reducing pore size and achieve the effects of improved ion selectivity, low cost and improved ion conductivity

Active Publication Date: 2018-01-16
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 Separators in Flow Batteries
  • Application of Hydrophilic Modified Porous Separators in Flow Batteries
  • Application of Hydrophilic Modified Porous Separators in Flow Batteries

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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 the application of a hydrophilized modified porous diaphragm in a liquid flow battery. The porous diaphragm is based on a polyvinylidene fluoride porous diaphragm, and a hydrophilic polymer is introduced into the surface and pores of the porous diaphragm. The water-based polymer is self-crosslinked and grafted on the surface and pores of the porous diaphragm to obtain a porous diaphragm cross-linked and grafted with a hydrophilic polymer; the preparation method of this type of porous diaphragm is simple, the pore size is controllable, and it is easy to realize mass production , the prepared hydrophilic porous membrane can effectively improve the membrane wettability and ion conductivity of the electrolyte.

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 type of flow battery due to its environmental friendliness, high charge and discharge efficiency, high safety, and good stability. It is also the liquid flow battery closest to industrialization. [0003] The battery separator is the key material of the all-vanadium redox flow battery. It plays the role of blocking the posit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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