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Mixed membrane for all-vanadium redox flow battery, preparation method and application

An all-vanadium redox flow battery and composite membrane technology, applied in fuel cells, regenerative fuel cells, circuits, etc., to achieve the effects of improving proton transfer rate, optimizing vanadium resistance performance, and optimizing proton transfer rate

Active Publication Date: 2021-07-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, little research has been done on the effect of the pore structure and channel properties of porous materials on battery performance, especially for VRFBs.

Method used

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  • Mixed membrane for all-vanadium redox flow battery, preparation method and application
  • Mixed membrane for all-vanadium redox flow battery, preparation method and application
  • Mixed membrane for all-vanadium redox flow battery, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation of embodiment 1 MOF-801 and MOF-808

[0045] Synthesis of MOF-801: 16g ZrOCl 2 ·8H 2 Add O and 5.8g fumaric acid to a 500mL screw cap bottle, then add 270mL 20:7 (v / v) DMF / formic acid mixed solution, add and mix well, heat the mixture at 130°C for 6 hours, cool to After room temperature, the white precipitate was collected by centrifugation, and washed more than 3 times with excess DMF to remove impurities, then, the precipitate was washed with deionized water 3 times a day for 3 days, and then washed with acetone again, after that, at room temperature Drying for 24 h, followed by vacuum drying at 150 °C for 24 h to obtain the activated MOF powder.

[0046] Synthesis of MOF-808: 4.85g ZrOCl 2 ·8H 2 O and 1.05g of trimesic acid were added to a 500mL screw cap bottle, then 450mL of 1:1 (v / v) DMF / formic acid mixed solution was added, added and mixed well. The mixture was heated at 130 °C for 48 h, and after cooling to room temperature, the white precip...

Embodiment 2

[0047] Example 2 Preparation of SPEEK / MOF hybrid membrane

[0048] SPEEK was prepared by sulfonating PEEK in sulfuric acid (98wt.%) at 50°C for 5h. Then SPEEK / MOF hybrid membranes were prepared by the following method.

[0049] A certain amount of MOF was dispersed in 5 mL of DMF by sonication. Then 5 mL of SPEEK / DMF solution (0.15 g / mL) was added to the MOF / DMF mixture, and the new mixture was sonicated for 2 hours, followed by stirring and mixing for 24 hours to form a homogeneous MOF / SPEEK mixture. Precisely control the loading amount of MOF (0-6%), and the actual film thickness is shown in Table 1 (50±2μm). The corresponding hybrid film is denoted as S / X-Y, where S is SPEEK, X represents the MOF type (for example, 801 is MOF-801, 808 is MOF-808), and Y is the mass ratio of MOF and SPEEK. Films were prepared by solution casting, then dried in an oven at 60 °C for 6 h, and then further dried in a vacuum oven at 100 °C for 12 h. After stripping from the glass plate, pass ...

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Abstract

The invention provides a mixed membrane for an all-vanadium redox flow battery, a preparation method and application, and belongs to the technical field of vanadium redox flow batteries. In the mixed membrane, a pair of acid-stable metal organic framework materials (screening type MOF and / or conduction type MOF) with different pore structures is adopted as a filling agent and fills a non-fluorinated polymer. The VRFB performance of the two mixed membranes is good, and the enhancement of the two mixed membranes is different. On one hand, the mixed membrane filled with the screening type MOF with the selective window is successfully combined with the molecular screening characteristic of the MOF, and shows remarkably enhanced vanadium resistance; on the other hand, mutually connected channels (hole channels) in the hydrophilic interior of the conduction type MOF form a highway for rapid proton transfer, so that the enhanced proton transfer rate is shown; and through the two MOF materials, the electrochemical performance of the all-vanadium redox flow battery is improved.

Description

technical field [0001] The invention relates to a mixed membrane for an all-vanadium redox flow battery, a preparation method and an application, and belongs to the technical field of vanadium redox flow batteries. Background technique [0002] Vanadium redox flow battery (VRFB), as a large-scale energy storage technology, has been proven to be effective for its environmental friendliness, high efficiency, adjustable power and capacity, long cycle life, and low maintenance cost For renewable energy with intermittent characteristics, the proton exchange membrane (PEM) not only plays the role of separating the positive and negative electrolytes, but also provides a channel for proton transmission. It is one of the most important components in the VRFB system, and its performance will be Greatly affect the performance of the battery system. Due to its excellent proton conductivity and excellent stability, DuPont's Nafion membrane has become the most commonly used PEM at presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0226H01M8/18
CPCH01M8/0226H01M8/188Y02E60/50
Inventor 徐至黄康忻粒汪朝辉
Owner NANJING UNIV OF TECH
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