A sulfonation-improved aqueous iron-based redox flow battery electrolyte with high solubility

By using asymmetric sulfonated ligands to chelate iron elements, a high-solubility sulfonation improved water-based iron-based liquid-flow battery electrolyte was prepared, which solved the problem of low solubility of the iron-based liquid-flow battery electrolyte, and achieved high stability and low-cost energy storage effect of the battery.

CN119275319BActive Publication Date: 2025-07-08BEIJING UNIV OF CHEM TECH
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Patent Information

Application Number
CN202411186908.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-27
Publication Date
2025-07-08
Estimated Expiration
2044-08-27

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Abstract

A sulfonated improved aqueous iron-based flow battery electrolyte with high solubility, belonging to the technical field of flow battery energy storage. To solve the problem of low solubility of the iron-based flow battery electrolyte, the present invention uses an asymmetric sulfonated ligand to chelate iron elements, and synthesizes a new type of iron-based flow battery electrolyte with high solubility, and the concentration of the active substance can reach more than 1.3 M at room temperature. The main components of the electrolyte are one or more iron salts, and an aqueous solution of a coordination compound formed by coordinating with 3-tris(hydroxymethyl)methylamino-2-hydroxypropanesulfonic acid (TAPSO), tris(hydroxymethyl)methylaminopropanesulfonic acid (TAPS), tris(hydroxymethyl)methylaminoethanesulfonic acid (TES) or its derivative chemicals. This electrolyte is compatible with ferrocyanide, can provide a voltage of more than 1.3 V, and exhibits excellent cycle stability while maintaining high solubility, creating new possibilities for the development and application of flow battery technology.
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Citation Information

Patent Citations

  • Electrolyte of water-based flow battery, all-iron water-based flow battery and application

    CN113764714A