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Electrolyte membrane and application of composite membrane thereof in liquid-flow energy storage battery with acidic electrolyte

A liquid flow energy storage battery and electrolyte diaphragm technology, which is applied in the direction of secondary batteries, regenerative fuel cells, battery components, etc., can solve problems such as low selectivity and current efficiency, reduced service life of electrolyte, and battery capacity attenuation , to achieve low water mobility, reduce uneven distribution and self-discharge phenomenon, and improve proton conductivity

Active Publication Date: 2010-08-18
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This proton conduction mechanism makes the membrane conduct protons while accompanying the migration of water molecules, which causes the imbalance of water distribution between the positive and negative electrolytes; Transmitted in the membrane, thus exhibiting lower selectivity and current efficiency, reducing the service life of the electrolyte
Therefore, this type of proton exchange membrane has poor selectivity to protons and ions.
During the operation of the battery, the ions in the positive and negative electrolytes permeate to the other side of the membrane, and chemically react with other ions of different valence states, resulting in self-discharge phenomenon. After long-term operation, the battery capacity decays significantly

Method used

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  • Electrolyte membrane and application of composite membrane thereof in liquid-flow energy storage battery with acidic electrolyte
  • Electrolyte membrane and application of composite membrane thereof in liquid-flow energy storage battery with acidic electrolyte
  • Electrolyte membrane and application of composite membrane thereof in liquid-flow energy storage battery with acidic electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1 g of polybenzimidazole was dissolved in N,N-dimethylacetamide to prepare a polymer solution with a mass fraction of 10%.

[0047] The obtained polymer solution was evaporated at 60° C. to obtain a polymer film.

[0048] The polymer film was placed in a vacuum oven at 160°C and heat-treated for 3h.

[0049] Remove the membrane, place the heat-treated membrane in deionized water for 100 hours to wash away residual impurities, and dry it.

[0050] The membrane treated by the above process was immersed in 5M / L sulfuric acid for acid treatment at room temperature for 48h.

[0051] After wiping off the residual acid on the surface of the membrane with filter paper, store it in a dry place for later use.

[0052] The acid-treated polybenzimidazole film and the non-acid-treated polybenzimidazole film were simultaneously assembled into VRB single cells, and their single cell performance was tested. The thickness of the electrolyte separator used is 30 microns, and the elect...

Embodiment 2

[0056] 1 g of polybenzimidazole was dissolved in N,N-dimethylacetamide to prepare a polymer solution with a mass fraction of 10%.

[0057] The obtained polymer solution was evaporated at 60° C. to obtain a polymer film.

[0058] The polymer film was placed in a vacuum oven at 160°C and heat-treated for 3h.

[0059] Remove the membrane, place the heat-treated membrane in deionized water for 100 hours to wash away residual impurities, and dry it.

[0060] The membrane treated by the above process was immersed in 3M / L sulfuric acid for acid treatment at room temperature for 72h.

[0061] After wiping off the residual acid on the surface of the membrane with filter paper, store it in a dry place for later use.

Embodiment 3

[0063] 1 g of polybenzimidazole was dissolved in N,N-dimethylacetamide to prepare a polymer solution with a mass fraction of 10%.

[0064] The obtained polymer solution was evaporated at 60° C. to obtain a polymer film.

[0065] The polymer film was placed in a vacuum oven at 160°C and heat-treated for 3h.

[0066] Remove the membrane, place the heat-treated membrane in deionized water for 100 hours to wash away residual impurities, and dry it.

[0067] The membrane treated by the above process was immersed in concentrated phosphoric acid for 20min at 60°C.

[0068] After wiping off the residual acid on the surface of the membrane with filter paper, store it in a dry place for later use.

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Abstract

The invention relates to an electrolyte membrane and application of a composite membrane thereof in a liquid-flow energy storage battery with acidic electrolyte. The electrolyte membrane uses polybenzimidazole or other aromatic heterocyclic polymers as a base membrane or is doped with a strong-acidity solution through composite techniques comprising an organic / inorganic technique, an organic / organic technique, a blending technique, a crosslinking technique, a strengthening technique and the like so that the acid content, the proton conductivity and the mechanical strength of the composite membrane are improved. Different from the traditional electrolyte membrane containing functional groups, the novel electrolyte membrane does not contain iron conduction groups, but utilizes acid in the electrolyte as the electrolyte to conduct protons. Due to the adoption of a Hopping conduction mechanism, the membrane reduces the iron permeation and the water migration of the liquid-flow energy storage battery, greatly reduces the crossing of anode and cathode electrolyte and prolongs the service life of the electrolyte. The preparation process is simple, and the prepared electrolyte membrane can effectively satisfy the requirements on the performance and the stability of the liquid-flow energy storage battery.

Description

technical field [0001] The invention relates to the preparation of a novel electrolyte diaphragm and its composite film and its application in an acidic electrolyte flow energy storage battery, especially the application as an electrolyte diaphragm of an all-vanadium liquid flow energy storage battery. Background technique [0002] Energy crisis and environmental pollution are two major problems facing the sustainable development of the world today. Carrying out energy conservation and consumption reduction, strengthening the development and utilization of renewable energy such as water energy, wind energy, solar energy, tidal energy, and nuclear energy are important ways to solve these two world-wide problems. In order to ensure the stable power supply of wind energy, solar energy and other renewable energy power generation systems, it is necessary to develop efficient, cheap, less polluting, safe and reliable energy storage technology; technology. Among the existing ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M8/18H01M10/38
CPCY02E60/528Y02E60/50Y02E60/10Y02P70/50
Inventor 张华民毕成张宇肖少华代化
Owner DALIAN RONGKE POWER
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