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A kind of silicon-based composite film and its preparation method and application

A composite membrane, silicon-based technology, applied in the field of silicon-based composite membrane and its preparation, can solve the problems of low discharge voltage of membrane electrode assembly, low methanol utilization efficiency, unfavorable continuous and stable operation of MEA, etc., to ensure stability, prevent Effects of diffusion, improved discharge stability and battery performance

Active Publication Date: 2020-03-24
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high concentration of pure methanol and severe transmembrane penetration, it is easy to make the methanol oxidation exothermic reaction on the cathode side of the battery too violent, resulting in low discharge voltage of the membrane electrode assembly (MEA), excessive water loss of the Nafion membrane, and low methanol utilization efficiency. and other issues
In addition, although the structure of the current passive DMFC can effectively promote the return of water generated by the cathode reaction to the anode, the water vapor in the anode catalytic layer is also easy to diffuse back to the methanol storage tank due to the concentration difference, resulting in insufficient concentration of water vapor retained in the anode of the battery. situation, and this situation is extremely unfavorable to the continuous and stable work of MEA

Method used

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  • A kind of silicon-based composite film and its preparation method and application
  • A kind of silicon-based composite film and its preparation method and application
  • A kind of silicon-based composite film and its preparation method and application

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preparation example Construction

[0067] Such as figure 1 As shown, the present invention also provides a method for preparing a silicon-based composite membrane. The method for preparing a silicon-based composite membrane includes at least the following steps:

[0068] S1: Preparation of casting solution for silicon-based membrane separation layer;

[0069] S2: stereotyped film formation;

[0070] S3: Post-treatment of silicon-based composite film.

[0071] The preparation method of the silicon-based composite film of the present invention will be described in detail below.

[0072] First, perform step S1: preparation of casting liquid.

[0073] Specifically, 50 to 150 parts of silicone polymer are added to 167 to 1500 parts of solvent, the stirring speed is 50 to 200 rpm, and the solution is stirred for 0.5 to 3 hours until the solution is uniform; then 5 to 15 parts of crosslinking agent are added, and the mixture is stirred for 0.5 to 3 hours. The solution is uniform; finally add 0.1 to 1 part of the catalyst and st...

Embodiment 1

[0086] Dissolve 80g of hydroxypropyl polydimethylsiloxane (viscosity 5000) in toluene solvent to prepare a solution with a mass ratio of 10%wt. After stirring for 1h, add 10g of ethyl orthosilicate (TEOS) to it and stir. Until it is uniformly dissolved, 0.5 g of dibutyl tin dilaurate (DBTDL) is added to it after 1 hour, and stirred for 1 hour to prepare a composite film casting solution. Degas the prepared casting solution under a vacuum pump for 30 minutes until no more bubbles are generated in the solution.

[0087] Casting and shaping film formation: Pour the degassed and clean casting liquid into the casting tank of the casting machine, and use commercial polyacrylonitrile (PAN) ultrafiltration membrane as the supporting bottom membrane, with a molecular weight cutoff of 15,000. After forming by casting machine, changing the height of the doctor blade to 100μm, the driving speed of 0.3m / min, the temperature of 60℃, and the thermal crosslinking for 6 hours, the silicon-based c...

Embodiment 2

[0090] Dissolve 90g of hydroxypropyl polydimethylsiloxane (viscosity 5000) in toluene solvent to prepare a solution with a mass ratio of 15% by weight. After stirring for 1.5h, add 11g of ethyl orthosilicate (TEOS) to it Stir until it dissolves evenly, add 0.8 g of dibutyl tin dilaurate (DBTDL) to it after 1.4 hours, and stir for 1.2 hours to prepare a composite film casting solution. Degas the prepared casting solution under a vacuum pump for 30 minutes until no more bubbles are generated in the solution.

[0091] Casting and shaping film formation: Pour the degassed and clean casting liquid into the casting tank of the casting machine, use commercial polyacrylonitrile (PAN) ultrafiltration membrane as the supporting bottom membrane, and cut off the molecular weight of 15000 to form by the casting machine, change the scraper The height is 200μm, the driving speed is 0.35m / min, the temperature is 65°C, and after 8 hours of thermal crosslinking, a silicon-based composite film is p...

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Abstract

The invention provides silicon-based composite film and a preparation method and application thereof; the silicon-based composite film comprises a silicon-based separator layer and a macromolecular film support layer connected with the silicon-based separator layer, wherein the silicon-based separator layer comprises, by weight, 50-150 parts of a silica polymer, 5-15 parts of a crosslinking agent, 0.1-1 part of a catalyst, and 100-3000 parts of a solvent. The macromolecular silica polymer is crosslinked to form the silicon-based separator layer, the silicon-based separator layer and the macromolecular film support layer are combined into the silicon-based composite film, Si in the macromolecular silica polymer forms stable chemical crosslinking structure so that the silicon-based composite film can exist stably in severe conditions, such as acids and bases or electrochemical condition; hydroxyl radicals at two side chain ends of the macromolecular silica polymer are separated from Si via methylene, and the stability of the chemical crosslinking structure is further ensured.

Description

Technical field [0001] The invention relates to the field of new energy storage batteries, in particular to a silicon-based composite membrane and a preparation method and application thereof. Background technique [0002] With the development and progress of society, the use of energy is exhausted, environmental pollution is becoming more and more serious, and people's desire to develop new clean energy is growing stronger. Therefore, the development of an environment-friendly new energy technology with high energy conversion efficiency is an urgent problem to be solved at present. Sustainable secondary energy can improve my country's energy structure and reduce pollution. It is an important strategic measure for the country to achieve sustainable development. Facing the challenge of the global energy crisis, the development of energy storage and conversion devices has always been the focus of research by scholars from all over the world. [0003] Due to the vigorous development...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0228H01M8/1011
CPCH01M8/0228H01M8/1011Y02E60/50
Inventor 徐建峰李秀丽蒋晶晶张凤茹邹志青杨辉钱汇东黄庆红
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI