A preparation method of functional porous polyvinylidene fluoride membrane for vanadium redox flow battery

A technology of polyvinylidene fluoride membrane and all-vanadium redox flow battery, which is applied to battery components, circuits, electrical components, etc., can solve the problems of high price and high vanadium ion transmission rate of proton exchange membrane, and achieve conductivity Good, good resistance to vanadium, good effect of ion selective permeability

Active Publication Date: 2019-10-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a functional porous polyvinylidene fluoride membrane for an all-vanadium redox flow battery, so as to solve the problems of high vanadium ion permeability and high price of the currently used proton exchange membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, the preparation method of functional porous polyvinylidene fluoride membrane for all-vanadium redox flow battery, the specific steps are as follows:

[0025] 1. Dissolve 4g of PVDF resin in dimethylacetamide (DMAC), heat and stir at 80°C for 5 hours to prepare a PVDF resin solution with a weight concentration of 10%.

[0026] 2. Add 3ml of the additive dibutyl phthalate to the PVDF solution in step 1, and continue stirring.

[0027] 3. Using the solution casting method, cast 50 mL of the PVDF resin solution in step 2 on a glass plate, dry at 80° C. for 10 hours and volatilize to form a film with a thickness of 60 μm.

[0028] 4. After taking out the diaphragm, soak it in methanol solution for 24 hours, and rinse it with deionized water to obtain a PVDF porous membrane. Wherein, the average pore diameter of the polyvinylidene fluoride porous membrane is 50nm-500nm, and the porosity of the polyvinylidene fluoride porous membrane is 40-80%.

[0029] 5. S...

Embodiment 2

[0033] The difference from Example 1 is:

[0034] 1. Add 1ml of the additive dibutyl phthalate to the PVDF solution in step 1, and continue stirring.

[0035] 2. The remaining steps are the same as in Example 1.

[0036] The relevant performance data of the present embodiment are as follows:

[0037] The diaphragm prepared in this example was assembled into a single battery for charge and discharge cycles. The Coulombic efficiency of the battery was 99%, the voltage efficiency was 70%, and the energy efficiency was 69.3%.

Embodiment 3

[0039] The difference from Example 1 is:

[0040] 1. Add 5ml of the additive dibutyl phthalate to the PVDF solution in step 1, and continue stirring.

[0041] 2. The remaining steps are the same as in Example 1.

[0042] The relevant performance data of the present embodiment are as follows:

[0043] The diaphragm prepared in this example is assembled into a single battery for charge and discharge cycles. The Coulombic efficiency of the battery is 90%, the voltage efficiency is 82%, and the energy efficiency is 73.8%.

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Abstract

The invention relates to the field of ion-exchange membranes for all-vanadium redox flow batteries (VRB), in particular to a method for preparing functional porous polyvinylidene fluoride (PVDF) membranes for all-vanadium redox flow batteries, which solves the problem of currently used perfluorinated Sulfonic acid proton exchange membrane has the problems of high vanadium ion permeability and high price. PVDF is used as raw material, dissolved in an organic solvent, and additives are added to make it evenly mixed. The uniform solution is spread on a clean glass plate, kept in an oven for a certain period of time, and then cooled to obtain a PVDF film. After the film is formed, the diaphragm is immersed in a solvent, and the mixed additives are leached out to form pores, and then the porous film is modified to prepare a functional porous polyvinylidene fluoride (PVDF) film. The method of the invention is simple in process, and the prepared membrane has low swelling, good dimensional stability, high mechanical strength, low vanadium ion permeability, good chemical and thermal stability, and low price, and is suitable for all-vanadium redox flow batteries ( VRB).

Description

technical field [0001] The invention relates to the field of functional porous polyvinylidene fluoride membranes for all-vanadium redox flow batteries (VRB), in particular to a preparation method for functional porous polyvinylidene fluoride (PVDF) membranes for all-vanadium redox flow batteries. Background technique [0002] The development of new energy sources such as wind energy and solar energy is an important way to solve the shortage of energy resources and represents the direction of future energy development. However, subject to time and geographical dependence, off-grid wind and solar power generation must use energy storage systems, otherwise it is difficult to utilize it around the clock. For direct grid connection, the energy storage system must also be used for peak regulation and frequency regulation of the grid, otherwise it will have a greater impact on the power and frequency of the grid. Therefore, efficient and large-scale energy storage technology has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/409
CPCH01M50/409Y02E60/10
Inventor 赵丽娜肖伟刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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