Proton exchange membrane for battery, preparation method and nanofiber composite structure

A technology of proton exchange membranes and nanofibers, which is applied in nanotechnology, fuel cells, nanotechnology, etc. for materials and surface science, and can solve the problems of thermal stability, chemical stability and low structural stability of proton exchange membranes. Poor membrane proton conductivity, complex proton exchange membrane preparation process and other problems, to achieve the effect of enhanced proton transport capability, good dimensional stability, and high elastic modulus

Active Publication Date: 2022-07-22
TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) The prior art proton exchange membrane has poor ability to regulate proton conduction
[0010] (2) Poor mechanical properties of prior art proton exchange membranes
[0011] (3) The prior art proton exchange membrane has low thermal stability, chemical stability and structural stability
[0012] (4) The preparation process of proton exchange membranes in the prior art is complex and costly

Method used

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  • Proton exchange membrane for battery, preparation method and nanofiber composite structure
  • Proton exchange membrane for battery, preparation method and nanofiber composite structure
  • Proton exchange membrane for battery, preparation method and nanofiber composite structure

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preparation example Construction

[0088] like figure 1 As shown, the preparation method of the stable and high-efficiency proton exchange membrane provided by the embodiment of the present invention includes:

[0089] S101, preparing a ternary copolymerized benzimidazole derivative.

[0090] S102, the main chain and the side chain are quaternized so as to have the structure of forming a double proton transport channel of the main chain and the side chain.

[0091] S103, the structure of the double proton transport channel of the main chain and the side chain is prepared into an electrospun nanofiber, which is compounded with a high temperature resistant polymer to form a proton exchange membrane with a nanoproton transport channel between the surface of the nanofiber and the polymer body .

[0092] In a preferred embodiment of the present invention, the ternary copolymerized benzimidazole derivative of the step S101 is made of biphenylenediamine monomer, aromatic diacid monomer, amino or hydroxyl substitute...

Embodiment 1

[0118] Preparation of terpolymerized benzimidazole derivatives. 3,3'-diaminobenzidine was first recrystallized from 4M hydrochloric acid to give the monomer as a white hydrochloride salt. Take 1.8006 grams of diaminobenzidine hydrochloride and 0.8306 grams of isophthalic acid / 5-aminoisophthalic acid and dissolve them in 25 grams of PDMA (methanesulfonic acid / P 2 O 5 = 10:1). Under mechanical stirring, the system was heated to 180 degrees Celsius and reacted for 5 hours. The reaction mixture was poured into 1000 mL of 2M aqueous sodium hydroxide solution, resulting in a fibrous precipitate. The precipitate was filtered, washed, and dried in an oven at 120 degrees Celsius.

Embodiment 2

[0120] Quaternization of the backbone of polybenzimidazole derivatives. 15 grams of polybenzimidazole derivatives and 400 grams of DMSO were placed in a three-necked flask, and were dissolved by mechanical stirring at 60 degrees Celsius for 12 hours. 8.1 g of KOH powder was added and stirring was continued at 70 degrees Celsius for 17 hours. Then 18 ml of methyl iodide were added and the reaction was continued at 70 degrees Celsius for 20 hours. Precipitated with 10 volumes of acetone, the resulting polymer was oven dried at 120°C.

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Abstract

The invention belongs to the technical field of preparation of proton exchange membranes, and discloses a proton exchange membrane for a battery, a preparation method of the proton exchange membrane, a nanofiber composite structure and the battery. Quaternized ternary copolymerized benzimidazole derivative nanofiber and a polymer are compounded to prepare the nanofiber composite structure; and a double-proton transmission channel with two dimensions of a main chain and a side chain is formed in the nanofiber composite structure. The proton exchange membrane with a main-chain and side-chain double-proton transmission channel is prepared for the first time, and the proton conduction capability of the proton exchange membrane is regulated and controlled by adjusting the grafting density and the side-chain length. According to the nanofiber composite structure, a nano proton channel can be constructed between the fiber surface and a composite polymer body, so that the proton conduction capability of the proton exchange membrane can be improved; meanwhile, the proton exchange membrane is endowed with good mechanical properties. The composite component of the high-temperature-resistant polymer is beneficial to further improving the thermal stability, chemical stability and structural stability of the proton exchange membrane.

Description

technical field [0001] The invention belongs to the technical field of preparation of proton exchange membranes, and in particular relates to a proton exchange membrane for batteries, a preparation method, a nanofiber composite structure and a battery. Background technique [0002] At present, the thermal stability, chemical stability, structural stability, as well as good mechanical properties and proton conductivity of proton exchange membranes are the fundamental guarantees to achieve high efficiency and long life of fuel cells. There are two types of proton exchange membranes: acidic proton exchange membranes and basic proton exchange membranes, which structurally correspond to sulfonate and quaternary ammonium salt functional groups, respectively. Therefore, the research and development strategy of high-efficiency proton exchange membrane is mainly the selection of membrane material and the design of membrane structure. [0003] For membrane materials, perfluorosulfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1069H01M8/1067H01M8/1041D01F6/74B82Y30/00B82Y40/00C22B3/22C22B7/00C25B13/08B01D71/62B01D69/02B01D69/12B01D67/00C02F1/44C02F1/28C02F101/20
CPCH01M8/1069H01M8/1041H01M8/1067D01F6/74B82Y30/00B82Y40/00C22B7/006C22B3/22C25B13/08B01D71/62B01D67/0002B01D67/0006B01D69/02B01D69/12C02F1/285C02F1/44C02F2101/20B01D2325/16B01D2325/40Y02P70/50
Inventor 林蔚然马洪洋史翊翔李爽蔡宁生张蔚喆刘梦华
Owner TSINGHUA UNIV
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