Preparation method of novel all-vanadium redox flow battery ion exchange membrane

An all-vanadium redox flow battery and ion exchange membrane technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as price hindering the industrialization process of vanadium batteries, and achieve the effect of a simple preparation route

Inactive Publication Date: 2015-07-01
SHENZHEN SINOCREDO NEW ENERGY TECH
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Problems solved by technology

However, the high price of imported Nafion117 membranes seriously hinders the industrialization process of vanadium batteries

Method used

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Experimental program
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Embodiment Construction

[0008] Weigh 10 grams of PVDF powder and dissolve it in 500 milliliters of NMP to form a uniform solution, which is coated to form a film. The PVDF membrane was placed in 500 ml of KOH ethanol solution with a concentration of 0.5 mol / L, and after alkali treatment under the protection of N2 gas, it was taken out and washed with deionized water until the pH value was constant. The washed PVDF membrane was immersed in a mixed solution of styrene and tetrahydrofuran for grafting reaction to obtain a PVDF-g-PS membrane, which was swelled in 1,2-dichloroethane for 2 hours, and then immersed in concentrated sulfuric acid ( mass fraction 98%), to obtain PVDF-g-PSSA membrane, washing and drying.

[0009] In order to measure the conductivity, charge and discharge characteristics, cycle performance and self-discharge performance of the ion exchange membrane (i.e. PVDF-g-PSSA membrane) prepared by this invention, high-density graphite plates can be used as positive and negative current co...

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Abstract

The invention discloses a preparation method of a novel all-vanadium redox flow battery ion exchange membrane. The preparation method comprises the steps of dissolving a given amount of PVDF (polyvinylidene fluoride) powder in NMP to form a uniform solution, and forming a membrane in a coating manner; placing the PVDF membrane in a 0.5mol / L KOH ethanol solution, carrying out the alkaline treatment under the protection of N2, taking out the PVDF membrane, and washing the PVDF membrane by utilizing deionized water until the pH value is constant; immersing the washed PVDF membrane in a mixed solution of styrene and tetrahydrofuran to have the grafting reaction to obtain a PVDF-g-PS membrane, swelling the PVDF-g-PS membrane for 2 hours in 1, 2-dichloroethane, then immersing the membrane in thick sulfuric acid of which the mass fraction is 98 percent, sulfonating the membrane to obtain the PVDF-g-PSSA membrane, and washing and drying the membrane. By adopting the preparation method, the conductivity of the ion exchange membrane can be improved, the chemical stability of the ion exchange membrane can be improved, and the vanadium ion permeation resistance can be improved.

Description

technical field [0001] The invention relates to a preparation method of a novel all-vanadium redox flow battery ion exchange membrane. Background technique [0002] All-vanadium redox flow battery (VRB) is a new type of chemical power source. It uses vanadium ions of different valence states dissolved in the electrolyte as the positive and negative active materials of the battery. The positive and negative electrolytes are stored separately. From the principle On the one hand, it avoids the self-discharge phenomenon in the battery storage process, and is suitable for large-scale energy storage process applications. Since the all-vanadium redox flow battery is of special significance to the power generation process of renewable energy such as wind energy and solar energy, it has been given priority in the development of the key technology of renewable energy utilization process in the world. [0003] The ion exchange membrane is an important part of the vanadium battery. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/94H01M4/88H01M4/96
CPCH01M4/88H01M4/94H01M4/96Y02E60/50
Inventor 任凤陈殿磊吴艳民
Owner SHENZHEN SINOCREDO NEW ENERGY TECH
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