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Preparation method and application of blended membrane based on microporous framework

A technology of blended membrane and framework, applied in the field of preparation of blended membrane based on microporous framework, can solve the problems of sacrificial material proton conductivity, hinder vanadium ion penetration, etc., to improve related properties, enhance vanadium resistance properties, and increase Coulombic efficiency Effect

Pending Publication Date: 2022-06-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, materials such as PTFE, ePTFE and PBI have been used to prepare high-performance PEMs, but most of these reinforced framework materials are hydrophobic materials, which will greatly sacrifice the proton conductivity of the material while hindering the penetration of vanadium ions.

Method used

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  • Preparation method and application of blended membrane based on microporous framework
  • Preparation method and application of blended membrane based on microporous framework
  • Preparation method and application of blended membrane based on microporous framework

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Preparation of PIM-1

[0032] Synthesis of PIM-1: 5.00 g of 5,5',6,6'-tetrahydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindole (CAS: 77- 08-7, TTSBI) and 3.00g of tetrafluoroterephthalonitrile were added to a 250mL three-necked flask, then 100mL of DMF solution was added, added and mixed well, the mixture was heated at 150°C for 5 hours, and 4.2292g was added during the reaction. Potassium carbonate. After cooling to room temperature, it was poured into water to wash, recrystallized with chloroform / methanol system for more than 3 times to remove impurities, and then vacuum-dried at 120 °C for 24 h to obtain PIM-1 powder, such as figure 1 (a).

Embodiment 2

[0033] Example 2 Preparation of cPIM-1

[0034] Synthesis of cPIM-1: 4.8g of PIM-1 prepared in Example 1 was added to a 250mL three-necked flask, then a mixed solution of 100mL of water and ethanol (mass ratio 1:1) was added, and 40g of sodium hydroxide was added and stirred , the mixture was heated at 120 °C for 7 d. After completion, it was cooled to room temperature, washed with water for several times to remove impurities, and finally activated with 1M hydrochloric acid solution, and then vacuum-dried at 120 °C for 24 h to obtain cPIM-1 powder, such as figure 1 (b) and figure 1 (c).

Embodiment 3

[0035] Example 3 Preparation of sPIM-1

[0036] Synthesis of sPIM-1: 2 g of cPIM-1 prepared in Example 2 was added to 20 mL of concentrated sulfuric acid with a mass-to-volume ratio of 1:10 (the mass of cPIM-1 was 1, and the volume of concentrated sulfuric acid was 10), and after mixing and stirring for 24 h It was poured into purified water and washed to neutrality, and then vacuum-dried at 120 °C for 24 h to obtain sPIM-1.

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Abstract

The invention discloses a preparation method and application of a blended membrane based on a microporous skeleton. The skeleton polymer is one of cyano PIM (PIM-1), oximido PIM (AO-PIM-1), carboxyl PIM (cPIM-1) and sulfo PIM (sPIM-1), and the base membrane is a non-fluorinated polymer with high proton conductivity. A membrane blending strategy which is simple in preparation process and strong in supporting framework is provided for the first time, and the mechanical stability of the ion conducting membrane is effectively improved. On one hand, the base membrane provides a large number of ion transmission channels; on the other hand, the spiral framework polymer restrains the movement of the chain, so that the stability of the membrane is improved. Through the mixing, a brand-new strategy is provided for improving the use strength of the diaphragm.

Description

technical field [0001] The invention relates to a preparation method and application of a microporous framework-based blended membrane, and belongs to the technical field of vanadium redox flow batteries. Background technique [0002] Vanadium redox flow batteries (VRFBs), as a large-scale energy storage technology, have been proven to be effectively utilized due to their environmental friendliness, high efficiency, adjustable power and capacity, long cycle life, and low maintenance costs. Renewable energy with intermittent characteristics, proton exchange membrane (PEM) not only plays the role of separating the positive and negative electrolytes, but also provides a channel for proton transport. It is one of the overall important components in the VRFB system, and its performance will Greatly affects the performance of the battery system. Currently, the most commonly used sulfonic acid-based separators have excellent proton conductivity and excellent stability, but their h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/18Y02E60/50
Inventor 徐至黄康夏宇侯清铭
Owner NANJING UNIV OF TECH
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