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Polybenzimidazole polymer ion exchange membrane and its preparation and application

A polybenzimidazole, ion exchange membrane technology, applied in electrical components, circuits, fuel cell parts and other directions, can solve the problems of high requirements for experimental devices, harsh operating conditions, difficult processing, etc., to improve hydrophilicity. properties, mild preparation conditions, good solubility and film-forming properties

Active Publication Date: 2011-12-28
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resin has the defects of being difficult to melt and process, and the film forming process has high requirements for experimental equipment and harsh operating conditions
Moreover, the film prepared by the poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] with a fully aromatic structure has less nitrogen that can be protonated and a higher resistance

Method used

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  • Polybenzimidazole polymer ion exchange membrane and its preparation and application
  • Polybenzimidazole polymer ion exchange membrane and its preparation and application
  • Polybenzimidazole polymer ion exchange membrane and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Dissolve 3.4 grams of phosphorus pentoxide in 34 grams of polyphosphoric acid, add it to a 500ml three-necked flask, heat up and stir to form a clear solution, then add 6mmol of biphenyltetramine, 6mmol of 4,4'-dicarboxydiphenyl ether , stirred and heated up to 200 degrees, after 20 hours of reaction, cooled down, poured into a solution containing 5% sodium hydroxide. After standing for 24 hours, wash well with water until the solution is neutral. Filter and dry. The prepared polymer was dissolved in DMSO to prepare a 4wt% solution, and the solution was cast onto a glass plate and flattened with a casting knife. After drying at 80°C for 20 hours, the membrane was removed from the glass plate. The dry polymer membrane was soaked in 4M sulfuric acid at room temperature for 5 hours to obtain a polybenzimidazole ion exchange membrane with a thickness of about 35 μm and no pyridine structural unit.

Embodiment 2

[0043] Dissolve 3.4 grams of phosphorus pentoxide in 34 grams of polyphosphoric acid, add it to a 500ml there-necked flask, heat up and stir to form a clear solution, then add 6mmol biphenyltetramine, 1.2mmol 2,6-pyridinedioic acid, 4.8 mmol 4,4'-dicarboxydiphenyl ether, stirred and heated up to 200 degrees, reacted for 20 hours, cooled down, and poured into a 5% sodium hydroxide solution. After standing for 24 hours, wash well with water until the solution is neutral. Filter and dry. The prepared polymer was dissolved in DMSO to prepare a 4wt% solution, and the solution was cast onto a glass plate and flattened with a casting knife. After drying at 80°C for 20 hours, the membrane was removed from the glass plate. The dry polymer membrane was soaked in 4M sulfuric acid at room temperature for 5 hours to obtain a polybenzimidazole ion exchange membrane with a thickness of about 35 μm and containing 20 wt% pyridine structural units. figure 1 For the preparation of infrared im...

Embodiment 3

[0045] Same as Example 2, the difference is that the membrane is soaked at room temperature for 3 days with 6M phosphoric acid instead of sulfuric acid, taken out and dried to obtain a polybenzimidazole ion exchange membrane with a thickness of 40 μm.

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Abstract

The invention relates to a polybenzimidazole polymer ion exchange membrane, and preparation and application thereof. The invention further relates to an acid electrolyte redox energy storage battery including the polymer ion exchange membrane in the invention. The preparation condition of the polybenzimidazole polymer ion exchange membrane including a pyridine group is moderate. The preparation process is simple. The batch production is facilitated. The prepared polybenzimidazole polymer ion exchange membrane including the pyridine group has good mechanical strength and simultaneously has good toughness. The polybenzimidazole polymer ion exchange membrane has good proton conduction performance and excellent penetration insulation performance of positive and negative ions in the acid electrolyte redox energy storage battery.

Description

technical field [0001] The present invention relates to a polybenzimidazole ion-exchange membrane containing pyridine groups and a preparation method thereof, in particular to the application of the polybenzimidazole ion-exchange membrane containing pyridine groups in all-vanadium redox flow batteries . Background technique [0002] Acidic electrolyte flow energy storage battery is a new electrochemical energy storage technology, which has the advantages of high energy conversion efficiency, flexible system design, large storage capacity, free site selection, deep discharge, etc. It is a large-scale and efficient energy storage technology. one of the preferred techniques. Vanadium redox flow battery (VRB) is a kind of acid electrolyte flow energy storage battery. Since the positive and negative electrodes use vanadium ion electrolytes with different valence states, it avoids the problems caused by the positive and negative electrodes of the electrolyte connected in series. ...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/16C08L79/04
CPCY02E60/50Y02E60/12
Inventor 李先锋张华民麦振声史丁秦
Owner DALIAN RONGKE POWER
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