A negative electrode electrolyte for alkaline all-iron flow batteries and its preparation method

By using polysaccharide alcohols and promoting components containing N and S coordinating heteroatoms to form a stable six-coordinate structure with iron ions in alkaline all-iron flow batteries, combined with strong complexing agents, the problems of low energy efficiency and short lifespan caused by the instability of ferrous ions are solved, and high-efficiency and safe battery performance is achieved.

CN116259810BActive Publication Date: 2026-05-26WUHAN GLT ENERGY & ENVIRONMENTAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN GLT ENERGY & ENVIRONMENTAL TECH CO LTD
Filing Date
2023-04-24
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The ferrous ions in existing alkaline all-iron flow batteries are unstable during charge and discharge, resulting in low energy efficiency, rapid capacity decay, and short cycle life. Existing complexing agents are unstable in strongly alkaline environments, and ferrous ions are easily reduced to elemental metals, causing problems such as hydrogen evolution reaction and membrane permeation.

Method used

Polysaccharide alcohols and promoting components containing N, S and other coordinating heteroatoms are used to form a stable six-coordinate structure with iron ions. Complexing agents such as triisopropanolamine and diethanol monoisopropanolamine are used, combined with alkaline components and auxiliary electrolytes, to improve the solubility and stability of ferrous ions and form a highly efficient negative electrode electrolyte.

Benefits of technology

It significantly improves the energy efficiency and cycle life of alkaline all-iron flow batteries, reduces construction costs, enhances battery stability and safety, and extends battery life.

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Abstract

This invention belongs to the field of flow battery energy storage technology, and relates to a negative electrode electrolyte for alkaline all-iron flow batteries and its preparation method. The negative electrode electrolyte is prepared from iron salts, a complexing agent, a promoting component, an alkaline component, an auxiliary electrolyte, and water. The total iron concentration is 0.1–2.0 mol / L, the molar ratio of the complexing agent to the iron salt is 1.5–4, the molar ratio of the promoting component to Fe is 0.05–1.0, the alkaline component concentration is 2.0–6.0 mol / L, and the auxiliary electrolyte concentration is 0–2.0 mol / L. The negative electrode electrolyte of this invention for alkaline all-iron flow batteries has a high total iron concentration, which not only avoids the precipitation of elemental iron during charging and discharging, but also effectively prevents the formation of ferric hydroxide precipitate, improves the stability of iron ions, and greatly extends the cycle life of the negative electrode electrolyte. It can be widely used in aqueous alkaline all-iron flow batteries.
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