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Positive electrode electrolytic solution for alkaline zinc-iron flow battery, and applications thereof

A positive electrolyte and flow battery technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of low charge and discharge capacity and conductivity of batteries, limit the industrialization prospects of flow batteries in the system, and increase the cost of electrolytes, etc. , to achieve excellent conductivity and stability, to expand the variety and application range, to improve the charge and discharge capacity and battery performance

Inactive Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the positive electrolytes used in zinc-iron redox flow batteries in alkaline systems at home and abroad are prepared from a single active material. The conductivity is low, which indirectly increases the cost of the electrolyte in the zinc-iron flow battery of the alkaline system, and limits the industrialization prospects of the flow battery of the system

Method used

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  • Positive electrode electrolytic solution for alkaline zinc-iron flow battery, and applications thereof
  • Positive electrode electrolytic solution for alkaline zinc-iron flow battery, and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 211g of potassium ferrocyanide and 242g of sodium ferrocyanide, heat and stir at 50°C for 2h, dissolve in 800mL of deionized water, then dilute the solution to 1L, and adjust the pH of the solution to 14 at the same time. The concentration of ferrocyanide in the obtained solution is 1mol / L.

[0027] Use the prepared electrolyte to assemble the alkaline system zinc-iron flow battery, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the ion exchange membrane is Nafion membrane produced by DuPont Company, with an effective area of ​​48cm 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 system zinc-iron redox flow battery is 98.8%, the voltage efficiency (VE) is 89.1%, and the energy efficiency (EE) is 88.0%. The average cha...

Embodiment 2

[0032] Same as Example 1, the ferrocyanide salt is replaced by sodium ferrocyanide and lithium ferrocyanide, and other conditions remain unchanged.

Embodiment 3

[0034] Same as Example 1, the ferrocyanide salt is replaced by potassium ferrocyanide, sodium ferrocyanide and lithium ferrocyanide, and other conditions remain unchanged.

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Abstract

The invention discloses a positive electrode electrolytic solution for an alkaline zinc-iron flow battery, and applications thereof, wherein the active material in the positive electrode electrolyticsolution is the cyanogen coordination compound of ferrous iron, and comprises two or more than three selected from potassium ferrocyanide, sodium ferrocyanide and lithium ferrocyanide, the total concentration of the cyanogen coordination compound of ferrous iron is 0.1-5 mol / L, and the concentration of each material is 0.05 mol / L-the saturated concentration of the solution. According to the present invention, the positive electrode electrolytic solution has the high active material concentration, and can effectively improve the conductivity of the electrolytic solution so as to improve the cycle performance of the battery and the battery efficiency while substantially improve the charge and discharge capacity and the energy density of the battery.

Description

technical field [0001] The invention relates to the technical field of an alkaline zinc-iron flow battery, in particular to an electrolyte for an alkaline zinc-iron flow battery and an application thereof. Background technique [0002] Liquid flow energy storage 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 location selection, deep discharge, safety and environmental protection, and maintenance. With the advantages of low cost, 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. Due to the advantages of high safety, good stability, long life (life > 15 years), and low cost, the alkaline system zinc-iron flow battery is considered to be a kind of flow energy storage ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/36
CPCH01M10/0568H01M10/36Y02E60/10
Inventor 段寅琦李先锋张华民史丁秦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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