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Aqueous neutral organic flow battery

A liquid flow battery, neutral technology, applied in the field of water-based organic flow batteries, can solve the problems of low battery voltage efficiency and energy efficiency, low power density, etc., and achieve the effect of improving battery performance, increasing power density, and low cost

Active Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, aqueous organic flow batteries, such as quinone bromine flow batteries, generally use expensive Nafion membranes or anion exchange membranes, resulting in low battery voltage efficiency and energy efficiency, and low power density.

Method used

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  • Aqueous neutral organic flow battery
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Embodiment Construction

[0022] The following examples are to further illustrate the present invention, but not to limit the scope of the present invention.

[0023] The electrolyte configuration is as follows:

[0024] 【1】Selected viologen derivatives: 2OH-V is the abbreviation of (1,1')-bis(2-ethanol)-4,4'-bipyridine dibromide.

[0025] 【2】Selected positive electrode active material: N Me —TEMPO is the abbreviation of 4-trimethylammonium TEMPO chloride.

[0026] 【3】Selected viologen: MV is the abbreviation of methyl viologen.

[0027] Assembly of single cell: The structure of single cell includes: end plate, positive and negative electrodes, diaphragm, liquid flow frame, bipolar plate, positive and negative storage tanks, pumps and pipelines.

[0028] After battery performance tests, the water-based organic neutral flow battery has excellent performance, with Coulombic efficiency up to 99%, voltage efficiency up to 85%, and energy efficiency up to 83%. And after 250 charge-discharge cycles, the ...

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Abstract

The aqueous neutral organic flow battery comprises a single battery or an electric pile consisting of more than two single batteries. Each single battery comprises a positive electrode, a diaphragm and a negative electrode. A positive electrolytic solution is introduced between the positive electrode and the diaphragm, and a negative electrolytic solution is introduced between the negative electrode and the diaphragm. The positive electrolyte in the positive electrolytic solution is a complexing agent of bromine salt and bromine; the negative electrolyte in the negative electrolytic solution is viologen or a viologen derivative; or electrolytes in the positive electrolytic solution and the negative electrolytic solution are bromine salt, a bromine complexing agent and viologen or viologenderivatives; and water is used as a solvent. The positive electrode is subjected to bromine ion redox reaction, the negative electrode is subjected to viologen single-electron or double-electron redoxreaction, and no metal element participates in electrochemical reaction. The positive electrolytic solution and the negative electrolytic solution are both neutral, and the diaphragm between the positive electrode and the negative electrode of the battery adopts a porous membrane. The battery has the characteristics of high energy density, low cost, sustainability and the like.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and in particular relates to an aqueous organic liquid flow battery. Background technique [0002] Due to resource problems of fossil energy and environmental pollution, we are gradually increasing the proportion of renewable energy in energy consumption. However, renewable energy such as wind energy and solar energy has the disadvantages of being discontinuous, unstable, and uncontrollable, which has caused great economic losses and waste of resources. Therefore, it is necessary to seek an efficient, reliable and safe energy storage technology to improve the quality and utilization of renewable energy. Flow batteries have become the most promising large-scale energy storage technology due to their advantages such as power and energy can be adjusted separately, not restricted by geographical environment, safe and reliable. [0003] At present, the relatively mature flow batteries include al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0002Y02E60/50
Inventor 李先锋刘婉秋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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