A kind of positive electrode electrolyte and application of alkaline zinc-iron redox flow battery

A positive electrolyte and flow battery technology, which is applied in the positive electrolyte and application fields of alkaline zinc-iron flow batteries, and can solve the problem of improving the electrolyte cost, battery charge and discharge capacity and conductivity of alkaline zinc-iron flow batteries Low and limit the industrialization prospects of flow batteries, etc., to achieve the effect of improving long-term cycle stability, increasing the concentration of conductive ions, and improving battery performance

Active Publication Date: 2021-06-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the positive electrode electrolytes used in alkaline zinc-iron flow batteries at home and abroad are prepared from a single active material. Although its chemical stability is excellent, the active material in the electrolyte is low, resulting in the battery's charge and discharge capacity and conductivity. The efficiency is low, which indirectly increases the cost of the electrolyte in the alkaline zinc-iron flow battery and limits the industrialization prospects of the flow battery of this system
At the same time, since the cyanide complex of the active material di- and / or trivalent iron in the positive electrolyte has a large amount of alkali metal or alkaline earth metal cations, the osmotic pressure of the positive electrolyte is much higher than that of the negative electrolyte, making the battery Serious migration of positive and negative electrolytes during long-term operation affects the stability of the battery under long-term operation conditions

Method used

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  • A kind of positive electrode electrolyte and application of alkaline zinc-iron redox flow battery
  • A kind of positive electrode electrolyte and application of alkaline zinc-iron redox flow battery
  • A kind of positive electrode electrolyte and application of alkaline zinc-iron redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 422g of potassium ferrocyanide and 532g of 18-crown (ether)-6, heat and stir at 50°C for 2h, dissolve in 750mL of deionized water, then dilute the solution to 1L, and adjust the value of the solution with potassium hydroxide pH to 14. The concentration of ferrocyanide in the obtained solution is 1 mol / L, and the concentration of 18-crown (ether)-6 is 2 mol / L.

[0029] The alkaline zinc-iron flow battery was assembled using the prepared electrolyte, in which the catalytic layer was activated carbon felt, the bipolar plate was a graphite plate, and the ion exchange membrane was a Nafion membrane produced by DuPont, with an effective area of ​​48 cm. 2 , with a current density of 80mA cm -2 , the zincate ion concentration in the negative electrode electrolyte is 0.5mol L -1 , the concentration of ferrocyanogen cyanide ion is 1mol L -1 . The coulombic efficiency (CE) of the assembled alkaline zinc-iron flow battery is 98.8%, the voltage efficiency (VE) is 89.1%, a...

Embodiment 2

[0034] Same as Example 1, the positive electrode electrolyte is changed to sodium ferrocyanide and 18-crown (ether)-6, and other conditions remain unchanged. The concentration of ferrocyanide in the obtained solution is 2 mol / L, and the concentration of 18-crown (ether)-6 is 2 mol / L.

Embodiment 3

[0036] Same as embodiment 1, the positive electrode electrolyte is replaced by lithium ferrocyanide and 12-crown-4, and other conditions are constant, the concentration of ferrocyanide in the solution obtained is 1.5mol / L, and the concentration of 12-crown-4 is 2mol / L.

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Abstract

The invention relates to an anode electrolyte for an alkaline zinc-iron redox flow battery and its application. One or two or more ferrocyanide salts are used as active substances, and crown ether substances or cryptand compounds are used as active substances. Additives, prepared positive electrode electrolyte. Compared with the original anode electrolyte prepared purely from ferrocyanide salt, the anode electrolyte has a higher active material concentration and lower cationic activity, and a higher active material concentration can effectively improve the conductivity of the electrolyte rate, thereby improving the cycle performance and battery efficiency of the battery, and at the same time greatly improving the charge and discharge capacity and energy density of the battery; lower cation activity can reduce the osmotic pressure of the electrolyte, inhibit the migration of the positive and negative electrolytes, and thus improve the efficiency of the battery. long-term cycle stability.

Description

technical field [0001] The invention relates to an anode electrolyte for an alkaline zinc-iron flow battery, a preparation method thereof, and an application thereof in an alkaline zinc-iron flow battery. Background technique [0002] Liquid flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, large storage capacity, free site selection, deep discharge, safety and environmental protection, and low maintenance costs. It can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. Alkaline zinc-iron flow batteries are considered to be a flow battery with high development potential due to their advantages of high safety, good stability, long life (lifetime > 15 years), and low cost. [0003] The positive and neg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/083H01M8/18
CPCH01M8/083H01M8/188Y02E60/50
Inventor 段寅琦李先锋袁治章张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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