Porous membrane with nanometer aperture and preparation method thereof

A porous membrane, pore size technology, applied in electrical components, circuits, battery pack components, etc., can solve the problems of adverse effects on the consistency of membrane product quality, difficulty in large-scale mass production, environmental pollution, etc., and achieve easy industrial scale production. , Strong electrochemical corrosion resistance, and the effect of improving ion conductivity

Inactive Publication Date: 2013-03-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1) The preparation or modification of membrane materials often uses sulfonating agents with strong corrosive properties, which are costly and easy to cause environmental pollution; 2) The treatment process often includes multiple steps, which adversely affects the quality consistency of membrane products , it is difficult to adapt to the requirements of large-scale batch production

Method used

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  • Porous membrane with nanometer aperture and preparation method thereof
  • Porous membrane with nanometer aperture and preparation method thereof
  • Porous membrane with nanometer aperture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Preparation of Nanopore Porous Membrane and Its Performance Test

[0030] Put 7.5 grams of polyvinylidene fluoride and 2.5 grams of sodium allyl sulfonate into a conical flask, add 60 ml of dimethyl sulfoxide (the mass ratio of polyvinylidene fluoride to dimethyl sulfoxide is 1:9 ) to obtain the casting solution. Place in a water bath at 80°C and stir for 2 hours until uniform. Thereafter, the film-casting solution was placed in a vacuum drying oven to remove air bubbles, and after standing still for 3 hours, the film was scraped on a glass plate to obtain a film with a thickness of 100 microns. The film was placed in an oven at 80° C. for 12 hours at a constant temperature to induce allyl sulfonate to form a low-molecular polymer while removing the solvent. Thereafter, the sodium allyl sulfonate low molecular weight polymer was removed by immersion in deionized water. This process was carried out three times to obtain a porous membrane with a membrane thic...

Embodiment 2

[0036] Embodiment 2: Preparation of nano-aperture porous membrane and its performance test under the condition of applying an external electric field

[0037] Put 7.5 grams of commercially available polyvinylidene fluoride and 2.5 grams of sodium allyl sulfonate into a conical flask, add 60 milliliters of dimethyl sulfoxide (the mass ratio of polyvinylidene fluoride to dimethyl sulfoxide is 1 : 9) Obtain a casting solution. Place in a water bath at 80°C and stir for 2 hours until uniform. Thereafter, the casting solution was placed in a vacuum drying oven to remove air bubbles, and after standing still for 3 hours, the film was scraped on a glass plate to obtain a film with a thickness of 220 microns. The film was placed between electrodes made of copper sheets at a distance of 1.2 mm from the electrode to the film surface. When other conditions are exactly the same, the film prepared without external electric field is used as a blank sample for comparison. The applied elec...

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Abstract

The invention discloses a porous membrane with nanometer aperture and a preparation method thereof. The preparation method comprises the following steps of: (1) dissolving a polymerization monomer containing hydrophilic radical groups and double bonds and polyvinylidene fluoride in an organic solvent, so as to obtain a casting film solution; (2) carrying out curtain coating on the casting film solution by using a casting film method to form a thin film; (3) carrying out polymerization reaction on the polymerization monomer inside the thin film to generate low-molecule polymers, so that the organic solvent inside the thin film is evaporated and removed; and further arranging the thin film in an outer electric field, so that the polymerization monomer is subjected to the polymerization reaction under the effect of the outer electric filed; and (4) placing the thin film processed in the step (3) for impregnation in a water solution, and removing all the low-molecule polymers, so as to obtain the porous membrane with the nanometer aperture. The porous membrane with the nanometer aperture is suitably used as a membrane in an electric chemical device, and further can be used in a separation process and a matter conversion process under the driving of the electric field. With the adoption of the preparation method provided by the invention, the complicated processes of normally using a sulfonating agent in the conventional preparation ion conduction film, executing a plurality of preparation steps and the like can be avoided. The preparation method is simple, and the industrial amplification production can be easily realized.

Description

technical field [0001] The invention relates to a diaphragm capable of ion selective conduction used in an electrochemical device and a preparation method thereof, in particular to a nano-aperture porous membrane and a preparation method thereof, which belong to the technical field of polymer material porous membranes. Background technique [0002] In recent years, with the development of the green environmental protection industry, people have paid great attention to the technology of using electrochemical devices to realize the mutual conversion between chemical energy and electrical energy, including various forms of clean energy development technologies such as fuel cells, lithium-ion batteries, and liquid flow batteries. . Usually, the electrochemical system contains two parts of oxidation / reduction, in which the oxidizing agent and reducing agent must be confined in the anode and cathode regions through the diaphragm, so as to avoid the oxidizing agent and reducing age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/18H01M2/16
CPCY02E60/12Y02E60/10
Inventor 王保国陈雨濛吴旭冉青格乐图郭伟男范永生
Owner TSINGHUA UNIV
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