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A kind of rice paper reinforced non-fluoride ion membrane for flow battery and preparation method thereof

A technology of flow batteries and ion membranes, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of limited improvement in mechanical properties, chemical stability, harshness, and inability to meet operating conditions, and achieves the promotion of commercialization development, The effect of stable battery performance and low material cost

Active Publication Date: 2019-03-19
SHENZHEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some methods are used to modify the non-fluoride ion membrane, which mainly improves the proton conduction efficiency, but its mechanical properties and chemical stability are limited, so it is only suitable for the application of fuel cells, and cannot meet the operating conditions. Demanding Flow Battery Requirements

Method used

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  • A kind of rice paper reinforced non-fluoride ion membrane for flow battery and preparation method thereof
  • A kind of rice paper reinforced non-fluoride ion membrane for flow battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A rice paper reinforced non-fluoride ion membrane for a liquid flow battery is prepared by the following steps:

[0037] (1) Add 1.0 g of sulfonated polyether ether ketone with an ion exchange capacity of 2.0 mmol / g to 10 mL of N,N-dimethylformamide solvent, and stir magnetically at 25°C for 24 h to make sulfonated polyetheretherketone Homogeneous solution of polyetheretherketone.

[0038] (2) Spread rice paper with a length of 30 cm, a width of 10 cm, and a thickness of 100 μm on a horizontal glass plate.

[0039](3) Pour the sulfonated polyether ether ketone solution prepared in step (1) onto the rice paper in step (2), and evenly scrape the sulfonated polyether ether ketone solution on the surface of the rice paper with a scraper, let it stand for 0.5 h, and then After drying at 70 ℃ for 12 h, vacuum drying at 120 ℃ for 12 h, and then removing the membrane in deionized water, the rice paper reinforced sulfonated polyether ether ketone membrane can be prepared. In t...

Embodiment 2

[0057] On the basis of Example 1, the ion exchange capacity of sulfonated polyether ether ketone in Example 1 was changed to 2.2 mmol / g, and the same preparation method as in Example 1 was used to prepare the rice paper reinforced sulfonated poly(etheretherketone) of this example. Ether ether ketone film. The rice paper reinforced sulfonated polyether ether ketone membrane has a thickness of 105 μm. An all-vanadium redox flow battery was assembled with rice paper reinforced sulfonated polyetheretherketone membrane, and other assembly conditions and test conditions were the same as in Example 1. In the performance experiment, the Coulombic efficiency of the battery was 98.2%, and the energy efficiency was 86.0%. In the life test, the coulombic efficiency is basically stable at 98.6% in 1000 continuous charge-discharge cycles, indicating that the rice paper reinforced sulfonated polyether ether ketone membrane has excellent stability.

Embodiment 3

[0059] On the basis of Example 1, the size of the rice paper in Example 1 was replaced with a length of 40 cm, a width of 15 cm, and a thickness of 50 μm, and the same preparation method as in Example 1 was used to prepare the rice paper reinforced sulfur of this example. Polyether ether ketone film. The rice paper reinforced sulfonated polyether ether ketone membrane has an area of ​​600 cm 2 , the thickness is 53 μm. An all-vanadium redox flow battery was assembled with rice paper reinforced sulfonated polyetheretherketone membrane, and other assembly conditions and test conditions were the same as in Example 1. In the performance experiment, the Coulombic efficiency of the battery was 98.3%, and the energy efficiency was 86.7%. In the life test, the coulombic efficiency is basically stable at 98.8% in 1000 continuous charge-discharge cycles, indicating that the rice paper reinforced sulfonated polyether ether ketone membrane has excellent stability.

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Abstract

The invention provides a Xuan-paper-enhanced non-fluorinated ionic membrane for a flow battery, and a preparation method for the Xuan-paper-enhanced non-fluorinated ionic membrane. The Xuan-paper-enhanced non-fluorinated ionic membrane for the flow battery comprises Xuan paper used as a framework-enhanced base material, and a sulfonic acid type non-fluorinated polymer filled in the Xuan paper base material; the preparation method for the Xuan-paper-enhanced non-fluorinated ionic membrane for the flow battery comprises the steps of dissolving the sulfonic acid type non-fluorinated polymer into an organic solvent based on mass volume ratio of 0.05-0.5g / mL, and stirring to prepare a sulfonic acid type non-fluorinated polymer solution; and then coating the Xuan paper with the solution, standing for 0.1-5h, drying and de-moulding to prepare the Xuan-paper-enhanced non-fluorinated ionic membrane for the flow battery. The Xuan-paper-enhanced non-fluorinated ionic membrane for the flow battery by adopting the technical scheme is low in cost, high in mechanical property and chemical stability, and capable of bearing long-term electrolyte washing and improving proton selectivity of the membrane, thereby enabling the flow battery to be higher in efficiency and longer in service life.

Description

technical field [0001] The invention relates to a liquid flow battery, in particular to a rice paper reinforced non-fluoride ion membrane for a liquid flow battery and a preparation method thereof. Background technique [0002] Liquid flow batteries, especially all-vanadium redox flow batteries, have outstanding advantages such as easy scale-up, ultra-long cycle life, freedom of site selection, and safe operation. It has been widely used in peak and promotion of renewable energy utilization. [0003] The ionic membrane (diaphragm) is the core component of the flow battery, which selectively conducts ions while isolating the positive and negative electrolytes and electrons. The ionic membrane directly determines the cost and efficiency of the flow battery, so it should have the following characteristics: low cost, good stability and high ion selectivity. Ionic membranes need to be low-cost because flow batteries are mainly used for large-scale energy storage, so reducing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1041H01M8/1053H01M8/1069H01M8/18
CPCH01M8/1041H01M8/1053H01M8/1069H01M8/188Y02E60/50
Inventor 于利红林峰徐玲
Owner SHENZHEN POLYTECHNIC
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