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Application of an organic-inorganic porous composite membrane in flow energy storage battery

A technology of liquid flow energy storage battery and porous composite membrane, which is applied in the components of fuel cells, battery electrodes, battery pack components, etc. Reduced oxidative stability, improved conductivity, slow effect of phase inversion process

Active Publication Date: 2016-04-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smaller the pore size of the porous membrane, the higher the ion selectivity, but at the same time, the ion conductivity of the membrane decreases due to the increase in the transport resistance to ions, thereby reducing the voltage efficiency of the battery.

Method used

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  • Application of an organic-inorganic porous composite membrane in flow energy storage battery
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  • Application of an organic-inorganic porous composite membrane in flow energy storage battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 4.5 g of polybenzimidazole was dissolved in 10.5 g of DMAC, and 0.225 g of gas-phase SiO was added 2 , stirred for 2 hours to form a uniform and transparent polymer solution, which was scraped on a glass plate with a glass rod, and the thickness of the scraping was 200 microns. Then place the glass plate together with the resin in an air environment at 50°C and 100% humidity. After 5 minutes, the glass plate was taken out and immersed in 5 L of water to wash the porous membrane. The internal pore diameter of the membrane is about 1um, the membrane surface pore diameter is about 5nm, and the membrane surface porosity is 50%.

[0039] figure 2 A cross-sectional SEM picture of the prepared membrane material is given, showing a regular pore structure. The all-vanadium flow energy storage battery is assembled by using the prepared porous diaphragm, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the m...

Embodiment 2

[0041] 4.5 g of polybenzimidazole was dissolved in 10.5 g of DMAC, and 0.09 g of gas-phase SiO was added2 , stirred for 2 hours to form a uniform and transparent polymer solution, which was scraped on a glass plate with a glass rod, and the thickness of the scraping was 200 microns. Then place the glass plate together with the resin quickly in an air environment with 50°C and 100% humidity. After 5 minutes, the glass plate was taken out and immersed in 5 L of water to wash the porous membrane. The internal pore diameter of the membrane is about 0.5um, the membrane surface pore diameter is about 5nm, and the membrane surface porosity is 70%. The all-vanadium flow energy storage battery is assembled by using the prepared porous diaphragm, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 80mAcm -2 , the vanadium ion concentration in the electrolyte is 1.50mol...

Embodiment 3

[0043] 5 g of polyethersulfone was dissolved in 15 g of DMAC, and 0.15 g of gas-phase SiO was added 2 , stirred for 2 hours to form a uniform and transparent polymer solution, which was scraped on a glass plate with a glass rod, and the thickness of the scraping was 200 microns. Then place the glass plate together with the resin quickly in an air environment with 50°C and 100% humidity. After 5 minutes, the glass plate was taken out and immersed in 5 L of water to wash the porous membrane. The internal pore diameter of the membrane is about 1um, the membrane surface pore diameter is about 5nm, and the membrane surface porosity is 50%. The all-vanadium flow energy storage battery is assembled by using the prepared porous diaphragm, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 80mAcm -2 , the vanadium ion concentration in the electrolyte is 1.50molL -1...

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Abstract

The invention relates to the application of an organic-inorganic porous composite membrane in a liquid flow energy storage battery. The porous composite membrane is made of one or more than two kinds of organic polymer resins, and at the same time, one or two kinds of The above nano-inorganic particles are prepared by a gas phase induced phase conversion method, wherein the gas phase is a poor solvent vapor atmosphere of an organic polymer resin. This type of membrane can effectively separate ions of different valence states, and can improve its ion conductivity while maintaining high ion selectivity. The preparation method of this type of membrane material is simple, the pore structure is controllable, the cost is low, and it is easy to realize mass production, which expands the processing method and selection range of membrane materials for liquid flow energy storage batteries.

Description

technical field [0001] The invention relates to the application of an organic-inorganic porous composite film in a liquid flow energy storage battery. Background technique [0002] Liquid flow energy storage battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, large storage capacity, free location selection, deep discharge, safety and environmental protection, and maintenance. With the advantages of low cost, it can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. Vanadium flow battery (VFB) is considered to be one of the first choices for large-scale energy storage technology due to its advantages of high safety, good stability, high efficiency, long life (life > 15 years), and low cost. [0003] The batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M4/94H01M50/403H01M50/446H01M50/489
CPCH01M8/0289Y02E60/50
Inventor 张华民李先锋张洪章李云段寅琦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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