Preparation method of large-scale energy-storage low-cost neutral flow battery

A liquid flow battery, a low-cost technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of high corrosion, high cost, and inability to commercialize, and achieve raw material reserves, low cost, and low equipment prices Effect

Active Publication Date: 2020-06-30
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to propose a method for preparing a large-scale energy storage and low-cost neutral flow battery, which solves the problems of high cost, high corrosion, and inability to commercialize existing in the prior art. , using this method, a large-scale neutral iron-sulfur flow battery with ultra-low cost, ultra-long cycle life, high performance and high safety can be obtained

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  • Preparation method of large-scale energy-storage low-cost neutral flow battery
  • Preparation method of large-scale energy-storage low-cost neutral flow battery
  • Preparation method of large-scale energy-storage low-cost neutral flow battery

Examples

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Embodiment 1

[0036] In this example, the preparation method of the low-cost neutral flow battery for large-scale energy storage is as follows:

[0037] (1) Use deionized water to prepare 0.8mol L -1 ~3mol L -1 KOH or NaOH alkali solution;

[0038] (2) Put ion exchange membrane (such as: Nafion membrane, SPEEK membrane or SPES membrane) in 2mol L -1 In sulfuric acid, keep the temperature at 40°C to 90°C for 1 to 5 hours, its function is to completely convert the ion exchange membrane into the proton type, so as to facilitate the subsequent ionization treatment. Then, in deionized water at a temperature of 40° C. to 90° C. for 0.5 to 2 hours, the function is to wash away excess acid.

[0039] (3) Immerse the ion-exchange membrane obtained in step (2) in the alkali solution prepared in step (1), and keep the temperature at 50°C to 90°C for 1-4h, and its function is to completely convert the ion-exchange membrane into desired ionic type.

[0040] (4) Immerse the ion-exchange membrane obta...

Embodiment 2

[0050] The difference from Example 1 is that the preparation method of the low-cost neutral flow battery for large-scale energy storage is as follows:

[0051] (1) Dissolve ferricyanide (such as: potassium ferricyanide or potassium ferrocyanide) in a molar concentration of 1mol L -1 In aqueous potassium chloride solution, the molar concentration of ferricyanide is prepared to be 0.1mol L -1 positive electrolyte.

[0052] (2) the sulfide (K 2 S) Soluble in molar concentration 2mol L -1 In the aqueous potassium chloride solution, the molar concentration of the prepared sulfide is 0.3mol L -1 negative electrode electrolyte.

[0053] (3) Both positive and negative electrode materials are carbon felt.

[0054] (4) Use potassium-ionized Nafion membrane or SPEEK membrane as a diaphragm, and use the above-mentioned positive and negative electrolytes and electrode materials to assemble a neutral flow battery single cell. The neutral zinc-iron flow battery has the advantages of lo...

Embodiment 3

[0058] The difference from Example 1 is that the preparation method of the low-cost neutral flow battery for large-scale energy storage is as follows:

[0059] (1) Dissolve ferricyanide (such as: sodium ferricyanide or sodium ferrocyanide) in a molar concentration of 1.5mol L -1 In aqueous potassium chloride solution, the molar concentration of ferricyanide is prepared to be 0.5mol L -1 positive electrolyte.

[0060] (2) the sulfide (such as: Na 2 S, Na 2 S 2 or Na 2 S 4 One or two mixtures) dissolved in a molar concentration of 2molL -1 In the aqueous potassium chloride solution, the molar concentration of the prepared sulfide is 2mol L -1 Negative electrolyte.

[0061] (3) Both positive and negative electrode materials are graphite felt.

[0062] (4) Using sodium-ionized Nafion membrane or SPEEK membrane as a diaphragm, using the above positive and negative electrolytes and electrode materials to assemble 10 neutral flow battery stacks in series. The neutral zinc-i...

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Abstract

The invention relates to the field of redox flow batteries applied to large-scale energy storage, in particular to a preparation method of a large-scale energy storage low-cost neutral flow battery, and aims to overcome the defects of high cost and high corrosivity in the field of large-scale energy storage flow batteries at present. An iron compound and an auxiliary neutral saline solution are used as a positive electrode electrolyte; a sulfur compound and an auxiliary neutral saline solution are used as a negative electrode electrolyte, and an ionized Nafion membrane, a PVDF membrane, a PTFEmembrane, a PP membrane, a PE membrane, a PEO membrane, an SPEEK membrane, an SPES membrane and a PBI membrane are used as ion exchange membranes of the flow battery. As the auxiliary electrolyte isan aqueous solution of neutral salt, the neutral flow battery system is low in corrosivity and long in cycle life. The prepared neutral flow battery system has the advantages of excellent battery performance, ultra-long cycle life, low cost, ultra-low maintenance cost and the like, and can be widely applied to the field of commercial large-scale energy storage flow batteries.

Description

technical field [0001] The invention relates to the field of redox flow batteries for large-scale energy storage applications, in particular to a preparation method for large-scale energy storage and low-cost neutral flow batteries. Background technique [0002] With the depletion of traditional fossil fuels and serious environmental pollution, it is imperative to find new energy and develop new energy technologies. However, renewable energy represented by wind power and solar energy has the disadvantages of discontinuity and instability, which cannot meet the needs of direct electricity consumption, and must be equipped with large-scale energy storage devices. Flow battery is currently the most promising large-scale energy storage device, which has the advantages of separation of storage capacity and output power, flexible design, long cycle life, fast response, deep repeatability and high safety. However, the most widely used flow battery (all-vanadium redox flow battery)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 贾传坤丁美
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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