A porous ion-conducting membrane with gradient distribution of pore size and its preparation and application

An ion-conducting membrane and gradient distribution technology, used in fuel cells, regenerative fuel cells, electrical components, etc., can solve the problems of reducing membrane ion selectivity and ion conductivity, and achieve improved selectivity and ion conductivity. Effect of battery performance, fast ion conductivity

Active Publication Date: 2022-03-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

The dense skin can endow the prepared porous ion-conducting membrane with high ion selectivity, but it will reduce the ion conductivity; the structure of the dense skin can be adjusted by adjusting the film-forming parameters, such as the composition of the coagulation bath and the solid content of the casting film. , the above method can effectively improve the ion conductivity of the membrane, but it will significantly reduce the ion selectivity of the membrane, that is, the porous ion-conducting membrane prepared by the traditional phase inversion method has a "trade-off" effect

Method used

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  • A porous ion-conducting membrane with gradient distribution of pore size and its preparation and application
  • A porous ion-conducting membrane with gradient distribution of pore size and its preparation and application
  • A porous ion-conducting membrane with gradient distribution of pore size and its preparation and application

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Experimental program
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Effect test

Embodiment 1

[0043] Using PES / PVP as the base material, dissolve PES / PVP in DMAC solvent to obtain a blend solution with a mass concentration of 35%, wherein the mass ratio of PES to PVP is 85:15. After the solution is completely dissolved, add 1.2g of carbonic acid Sodium hydrogen (accounting for 43% of the polymer resin, particle size 5-15nm), and uniformly stirred and dispersed; the above-mentioned blended solution was poured on a clean and flat glass plate, and the solvent was volatilized for 10s under 20% humidity, and then the The whole is immersed in a 10wt% hydrochloric acid solution for 3 minutes, and prepared at 25° C. to form a porous ion-conducting membrane, referred to as a P-P membrane. Characterize its microscopic morphology. From figure 1 From the SEM image of b, it can be seen that the cross-sectional cortex structure of the prepared P-P membrane has an obvious pore structure; at the same time, the pore size has an obvious gradient distribution, and the distribution chang...

Embodiment 2

[0046] Using PES / PVP as the base material, dissolve PES / PVP in DMAC solvent to obtain a blend solution with a mass concentration of 35%, wherein the mass ratio of PES to PVP is 85:15. After the solution is completely dissolved, add 1.6g of carbonic acid sodium hydrogen (accounting for 57% of the polymer resin), and uniformly stir and disperse; pour the above blended solution on a clean and flat glass plate, evaporate the solvent for 10s under 20% humidity, and then immerse it as a whole in 10wt% hydrochloric acid In the solution, a porous ion-conducting membrane with a gradient distribution of pore diameters is prepared at 25°C. The size of the large pores is 2.8 μm to 3.2 μm; the size of the middle pores is 235 nm to 260 nm; the size of the small pores is 0.9 to 1.4 nm. 500nm, the thickness of the macroporous support layer is about 100um, and the porosity of the membrane is 80% to 85%. Due to the increase in the content of sodium bicarbonate added, more bubbles are generated ...

Embodiment 3

[0048] Using PES / PVP as the base material, dissolve PES / PVP in DMAC solvent to obtain a blend solution with a mass concentration of 35%, wherein the mass ratio of PES to PVP is 85:15. After the solution is completely dissolved, add 1.2g of carbonic acid Sodium (accounting for 43% of the polymer resin), and uniformly stirred to disperse; pour the above blended solution on a clean and flat glass plate, evaporate the solvent for 10s under 20% humidity, and then immerse it as a whole in 10wt% hydrochloric acid solution In 25°C, a porous ion-conducting membrane with a gradient distribution of pore sizes was prepared. The macropore size is 3.0μm~3.2μm; the mesopore size is 240nm~260nm; the small pore size is 1.0~1.4nm, the thickness of the cortex is about 500nm, the thickness of the macropore support layer is about 100um, and the porosity of the membrane is 70%~ 85%. Because sodium carbonate is added, in the film forming process, the hydrochloric acid in the coagulation bath first ...

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Abstract

The invention discloses the application of a porous ion-conducting membrane with a gradient distribution of pore diameters in an alkaline zinc-iron liquid flow battery. This type of film is prepared by blending organic polymer resin and inorganic particles that can react with acid to generate gas, and then undergo phase inversion in acid solution. During the film forming process, the solvent of the casting solution is exchanged with the non-solvent to form a pore structure. At the same time, after the protonic acid in the non-solvent enters the casting solution, it reacts with the inorganic particles in the casting solution to generate gas, so that the The process produces a porous ion-conducting membrane with a gradient distribution of pore sizes. This kind of porous ion-conducting membrane with gradient distribution of pore diameter has a simple process, environmentally friendly process, controllable pore diameter and porosity, and is easy to realize mass production. Compared with the original porous membrane, this kind of porous ion-conducting membrane with gradient distribution of pore size can control the pore structure by controlling the content of inorganic particles and the concentration of acid in the non-solvent, and the assembled flow battery has good battery performance.

Description

technical field [0001] The invention relates to a porous ion-conducting membrane material with a gradient distribution of pore diameters, in particular to a preparation method of the membrane and its application in a liquid flow battery. Background technique [0002] Flow battery energy storage technology has the characteristics of environmental friendliness, high safety, flexible design and long cycle life, and is very suitable for applications in the field of distributed energy and large-scale energy storage. As the key material of flow batteries, the physical and chemical properties and cost of ion-conducting membranes directly affect the performance and cost of the battery system. Commercialized perfluorosulfonic acid ion exchange membrane (trade name: ) The production process is complicated and the price is expensive (about 600-800 US dollars / square meter). -2 Under the condition of working current density, the Coulombic efficiency of the battery is only 76%), which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1067H01M8/1069H01M8/1086H01M8/18
CPCH01M8/1067H01M8/1069H01M8/1086H01M8/188Y02E60/50
Inventor 袁治章李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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