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

A technology of liquid flow battery and electrolyte, which is applied in the field of electrolyte, can solve the problems of poor stability and high cost of water flow battery, and achieve the effect of excellent stability, not easy to decompose, and wide voltage window

Active Publication Date: 2021-12-07
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the present invention provides an electrolyte for an aqueous flow battery, an all-iron aqueous flow battery and its application, the positive and negative electrolytes contain the first complex formed by iron ions and cyanide , the negative electrode electrolyte contains iron ions and bis(2-hydroxyethyl)amino(trimethylol)methane or 3-[N-N-bis(2-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid The second complex, thus constructing an all-iron aqueous flow battery, which has been proved by experiments, realizes ion conduction through the cation exchange membrane Nafion series diaphragm, and can achieve long-term stable reversible cycle, so as to solve the problem of existing water system High cost of flow battery and technical problems of poor stability in Nafion diaphragm

Method used

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

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Embodiment 1

[0037] A kind of aqueous liquid flow battery, contains the potassium ferrocyanide (K 4 Fe(CN) 6 ), 0.2mol / L of sodium ferrocyanide (Na 4 Fe(CN) 6 ), 0.5mol / L of sodium hydroxide, 0.5mol / L of potassium hydroxide aqueous solution (10mL), the negative electrode electrolyte contains 0.2mol / L of iron ions and bis (2-hydroxyethyl) amino (trimethylol base) methane complex, 0.2mol / L iron ion and 3-[N-N-bis(2-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid complex, 0.5mol / L Aqueous solution (10 mL) of sodium hydroxide and 0.5 mol / L potassium hydroxide.

[0038] The specific production process of negative electrode electrolyte is as follows: what water adopts is the deionized water after inert gas bubbling deoxygenation, and the production process of negative electrode electrolyte is as follows: what adopts is the deionized water (10mL) after inert gas bubbling deoxygenation, Add 0.4g ferric sulfate, 0.162g ferric chloride, 0.242g ferric nitrate, stir for 240 minutes, rotating spe...

Embodiment 2

[0043] A kind of aqueous liquid flow battery, positive pole electrolyte contains the potassium ferricyanide (K ferricyanide) of 0.2mol / L 4 Fe(CN) 6 ), 0.2mol / L lithium ferricyanide (Na 4 Fe(CN) 6 ), 0.5mol / L lithium hydroxide, 0.5mol / L potassium hydroxide aqueous solution (10mL); the negative electrode electrolyte contains 0.2mol / L ferrous ion and bis(2-hydroxyethyl) amino (trihydroxyl The complex formed by methyl) methane, the complex formed by 0.2mol / L ferrous ion and 3-[N-N-bis(2-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid, 0.5mol / L Aqueous solution (10 mL) of lithium hydroxide of L and potassium hydroxide of 0.5 mol / L.

[0044] The specific production process of negative electrode electrolyte is as follows: what water adopts is the deionized water after inert gas bubbling deoxygenation, and the production process of negative electrode electrolyte is as follows: what adopts is the deionized water (10mL) after inert gas bubbling deoxygenation, Add 2mmol ferrous sul...

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Abstract

The invention belongs to the field of flow batteries, and particularly relates to an electrolyte of a water-based flow battery, an all-iron water-based flow battery and application of the all-iron water-based flow battery. According to the invention, ligands which are stably complexed with iron in an alkaline environment are respectively introduced into the positive electrode electrolyte and the negative electrode electrolyte, and the two ligands have different degrees of influence on the electron gaining and losing capabilities of iron ions or ferrous ions; a potential difference exists between a first complex contained in the positive electrode electrolyte and a second complex contained in the negative electrode electrolyte under the electrified condition, and the first complex is ferricyanide or ferrocyanide; the second complex is a complex formed by iron ions or ferrous ions and bis (2-ethoxyl) amino (trihydroxymethyl) methane or 3-[N-N-bis (2-ethoxyl) amino]-2-hydroxy propanesulfonic acid, so that the total-iron aqueous flow battery is constructed, and the flow battery realizes ion conduction through a cation exchange membrane Nafion series diaphragm and can stably and reversibly circulate for a long time.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and more specifically relates to an electrolyte solution of an aqueous liquid flow battery, an all-iron aqueous liquid flow battery and applications thereof. Background technique [0002] Flow battery is a new type of technology suitable for large-scale energy storage. It can realize the decoupling of energy and power through separate adjustment of battery reactor and electrolyte storage tank. Therefore, the design of energy storage system is more flexible and the maintenance cost is lower. It has important application value in wind / photovoltaic peak regulation and grid connection. At present, flow batteries can be divided into organic flow batteries, organic-aqueous composite flow batteries and aqueous flow batteries according to the type of solvent. Among them, aqueous flow batteries have attracted extensive attention due to their advantages of safety, stability, and low cost. Among the a...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0002H01M2300/0005Y02E60/50
Inventor 段将将孟锦涛明伟伟肖汉
Owner HUAZHONG UNIV OF SCI & TECH
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