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A kind of preparation method of speek/mcm composite diaphragm

A composite diaphragm, vanadium oxidation technology, applied in fuel cells, regenerative fuel cells, electrical components, etc., can solve the problems of high cost and vanadium ion penetration price, achieve low internal resistance, improve mechanical properties and chemical stability, and reduce costs. Effect

Active Publication Date: 2021-03-23
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to provide a method for preparing a SPEEK / MCM composite diaphragm suitable for vanadium batteries, which solves the problems of serious penetration of vanadium ions and high price in existing commercial diaphragms

Method used

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  • A kind of preparation method of speek/mcm composite diaphragm
  • A kind of preparation method of speek/mcm composite diaphragm
  • A kind of preparation method of speek/mcm composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this example, the preparation method of the sulfonated polyether ether ketone / modified carbonaceous mudstone composite diaphragm is as follows:

[0044] 1. Preparation of MCM: Dissolve carbonaceous mudstone solids in sulfuric acid with a molar concentration of 1M to a mass-volume ratio of 1 / 5 (g / mL). The reaction was stirred at room temperature and 1500r / min for 2h. After the reaction, the precipitate was centrifuged and washed with deionized water until neutral, and dried in an oven for 24h to obtain a dry solid. The dried solid was heated under reflux and stirred for 12 hours with nitric acid with a molar concentration of 3M. After the reaction, the precipitate was centrifuged and washed with deionized water to neutrality, and dried in an oven for 24 hours to obtain dry functionalized carbonaceous mudstone MCM powder. . Such as figure 1 As shown, the obtained dry functionalized modified carbonaceous mudstone MCM powder has a particle size of 200-700nm.

[0045] ...

Embodiment 2

[0057] The difference from Example 1 is:

[0058] 150 mg of MCM powder was weighed and added into the SPEEK solution, and the rest of the steps in Example 1 were used to prepare the SPEEK / MCM composite diaphragm. Wherein, the MCM content of the SPEEK / MCM mixed solution is 5wt%.

[0059] In this example, the thickness of the obtained SPEEK / MCM composite diaphragm is 68 μm, the texture of the composite diaphragm is uniform and dense, there is no MCM dissolution phenomenon, and it has good flexibility and mechanical properties.

[0060] The relevant performance data of the present embodiment are as follows:

[0061] The battery test using the separator at room temperature shows that the composite separator vanadium battery prepared at this ratio has good performance, but the capacity retention is worse than that of the separator prepared in Example 1, which is not conducive to the long-term cycle of the vanadium battery. Compared with the preparation of the separator in Example...

Embodiment 3

[0063] The difference from Example 1 is:

[0064] Weigh 600 mg of MCM powder and add it into the SPEEK solution, and use the rest of the steps in Example 1 to prepare the SPEEK / MCM composite diaphragm. Wherein, the MCM content of the SPEEK / MCM mixed solution is 20wt%.

[0065] In this example, the thickness of the obtained SPEEK / MCM composite diaphragm is 72 μm, and the texture of the composite diaphragm is uniform, but the MCM has agglomeration and dissolution phenomenon, which is not suitable for application in vanadium batteries.

[0066] The results of the examples show that the present invention uses a dissolution method to prepare a SPEEK solution, uses the functionalized MCM as a proton selective conduction channel, and adopts film-forming methods such as step-by-step dispersion and solution casting to prepare a SPEEK / MCM composite diaphragm. The composite membrane prepared by the invention has the advantages of good proton selective conductivity, excellent vanadium io...

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Abstract

The invention relates to the field of separators for all-vanadium redox flow batteries, in particular to a preparation method of a sulfonated polyetheretherketone / modified carbonaceous mudstone composite separator, and solves the problems of serious vanadium ion penetration and high price in the existing commercial proton exchange membranes. Based on low-cost sulfonated polyetheretherketone (SPEEK), modified carbonaceous mudstone (MCM) with optimized proton conduction channels is prepared by acidification treatment using carbonaceous mudstone, which is a common building poorly-graded filler, as a substrate. The SPEEK / MCM composite separator is prepared by a film formation method such as dispersion in steps and solution casting. The composite separator prepared by the invention has the advantages of good proton selective conductivity, excellent vanadium ion barrier properties, good mechanical properties and chemical stability, and excellent vanadium single cell performance, and can be widely applied to the field of all-vanadium redox flow batteries.

Description

Technical field: [0001] The present invention relates to the field of diaphragms used in all-vanadium redox flow batteries (abbreviated as vanadium batteries or VRBs), in particular to a new type of diaphragm suitable for all-vanadium redox flow batteries based on modified carbonaceous mudstone (Modified carbonaceousmudstone, MCM). Preparation method of SPEEK / MCM composite diaphragm. Background technique: [0002] Vanadium battery is the most feasible electrochemical energy storage technology for large-scale energy storage supporting new clean energy (wind energy, solar power generation, etc.). At present, the main problem restricting the commercialization of vanadium batteries is the high cost. Among them, the high-cost diaphragm material is the main limiting factor of the cost of the vanadium battery system, so it is the key material that restricts the commercial development of the vanadium battery. A good separator material should have good proton conductivity, good sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 付宏渊曾铃贾传坤叶家业楼雪纯吴春丁美
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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