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Ionic conduction membrane for flow battery and preparation and application thereof

A technology for ion-conducting membranes and flow batteries, applied to ion-conducting membranes and their applications in flow batteries, can solve problems such as reduced membrane stability, and achieve the effects of improving selectivity, improving conduction, and improving preparation methods

Inactive Publication Date: 2019-04-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the introduction of ion-exchange groups in this type of porous membrane, the stability of the membrane is reduced. How to develop an ion-conducting membrane with high stability, high ion conductivity, and high ion selectivity suitable for flow batteries has become a challenge in this field. Research Hotspots

Method used

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  • Ionic conduction membrane for flow battery and preparation and application thereof
  • Ionic conduction membrane for flow battery and preparation and application thereof
  • Ionic conduction membrane for flow battery and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 10 g of chloromethylated polysulfone were dissolved in 400 g of DMAc (wherein the 1 The degree of chloromethylation of the prepared chloromethyl polysulfone as measured by HNMR is 1.3), stirred for 12 hours to form a uniform polymer solution, left to defoam, scraped on a dust-free glass plate, placed at 50 ° C, 10 minutes in a constant temperature and humidity chamber with a relative humidity of 100%, soak in deionized water for 12 hours after removing the solvent on the surface. Soak the porous ion-conducting membrane prepared above in 40°C, 5% trimethylamine aqueous solution, take it out after 5 minutes, wash it with deionized water, then soak the above-mentioned porous ion-conducting membrane grafted with trimethylamine in 40°C, 10% trimethylamine imidazole aqueous solution, take it out after 72h, wash with deionized water, soak in 3mol / L H 2 SO 4 12h in aqueous solution.

[0035] Use the porous ion-conducting membrane prepared by the above method to assemble an a...

Embodiment 2

[0037] The material characterization method and basement membrane preparation and characterization method were the same as in Example 1. The porous ion-conducting membrane prepared above was soaked in 5% pyridine aqueous solution at 40°C, taken out after 5 minutes, washed with deionized water, and then the above-mentioned grafted pyridine Soak the porous ion-conducting membrane in 10% imidazole aqueous solution at 40°C, take it out after 72 hours, wash it with deionized water, soak it in 3mol / L H 2 SO 4 12h in aqueous solution.

[0038] The battery assembly and test conditions are the same as in Example 1. In the charge and discharge experiment, the current density is 80mA / cm 2 , image 3 It can be seen that its coulombic efficiency is 97.9%, its voltage efficiency is 91%, and its energy efficiency is 89.1%. 2 Under the current density, the energy efficiency is maintained at 81% after 1000 cycles of charging and discharging.

Embodiment 3

[0040] 4 grams of chloromethylated polysulfone (wherein 1 HNMR records that the degree of chloromethylation of the prepared chloromethyl polysulfone is 1.2) Dissolved in 16 grams of DMAc, stirred for 12h, formed a uniform polymer solution, added 0.5g piperidine, stirred into a uniform solution, and statically Put it in defoaming, scrape it on a dust-free glass plate, put it on a hot stage at 50°C to evaporate the solvent to form a dense film (film thickness is about 32μm), and then soak the ion-conducting membrane prepared above to 40°C, 10% imidazole aqueous solution, take it out after 72h, wash with deionized water, soak in 3mol / L H 2 SO 4 12h in aqueous solution.

[0041] The battery assembly and test conditions are the same as in Example 1. In the charge and discharge experiment, the current density is 80mA / cm 2 , image 3 It can be seen that its coulombic efficiency is 98.6%, the voltage efficiency is 91.2%, and the energy efficiency is 89.9%. 2 Under the current den...

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Abstract

The invention relates to an ionic conduction membrane for flow battery and preparation and application thereof. Chloromethylation or bromoethylation organic polymer resin is taken as raw materials toprepare an ionic conduction membrane base body, or the mixed materials of the organic polymer resin and the chloromethylation or the bromoethylation organic polymer resin are taken as raw materials toprepare an ionic conduction membrane base body, a hydrophilic reagent is employed to graft with a hydrophilic group on the ionic conduction membrane base body, the hydrophilic group is a quaternary ammonium group, and a crosslinking agent is employed on the membrane base body to form an ionic conduction membrane with a crosslinked structure, wherein the mass ratio of the organic polymer resin andthe chloromethylation or bromoethylation organic polymer resin is 0:1, and the crosslinking agent is the diamine group. The ionic conduction membrane is simple in process, high in ion transmission performance and good in chemical and mechanical stability so that the all-vanadium redox flow battery assembled by the ionic conduction membrane prepared by employing the method is good in excellent ionic conduction performance, high in ion selection performance and good in cycling stability.

Description

technical field [0001] The invention relates to an ion conduction membrane for a flow battery, in particular to an ion conduction membrane with high ion conductivity and its application in a flow battery. Background technique [0002] Due to the increasingly severe energy crisis and environmental problems, it is necessary to develop energy storage technology to improve the efficient use of renewable energy (such as wind energy and solar energy) and to achieve clean and sustainable energy use. Among many energy storage technologies, flow batteries can meet the requirements of long-term and large-scale energy storage, and have high conversion efficiency, flexible system design, high storage capacity, free site selection, deep charge and discharge, safety and environmental protection, It has attracted much attention due to its advantages such as low maintenance costs. Vanadium redox flow battery (VFB) has the characteristics of high safety, good stability, high efficiency, lon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/409H01M50/403Y02E60/10
Inventor 李先锋赵于月张华民袁治章鲁文静乔琳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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