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Alkaline zinc-iron flow battery

A liquid flow battery, zinc-iron technology, applied in the direction of alkaline electrolyte, fuel cell, battery electrode, etc., can solve the problems of low electrochemical performance, complex structure, poor stability, etc., and achieve good application prospects, high power density, The effect of high energy density

Inactive Publication Date: 2018-08-28
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

Patent 201180016873.6 discloses that a class of alkaline zinc-iron flow battery pack is composed of conductive mesh and non-conductive mesh; screen; belt; foam structure; array of cones, cylinders or pyramids; and wires or tubes Other arrangements are made, and the electrode is a porous mesh metal electrode. Although it shows good performance, its structure is relatively complex and its electrochemical performance is low. In addition, the membrane material is perfluorosulfonic acid membrane (Nafion), which is expensive. Poor stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Dense film of nitrogen-containing heterocyclic polyoxadiazole (POD), the positive electrolyte is 0.6mol / L Fe(CN) 6 4- +3mol / LOH - solution; negative electrode electrolyte is 0.3mol / L Zn(OH) 4 2- +3mol / L OH - solution; the positive and negative electrolyte volumes are 60mL each; the battery adopts constant current charge and discharge mode, at 80 mA cm -2 Charge for 10min under the condition of the current density, and then cut off the voltage as the condition, 80mA cm -2 Discharge to 0V under the condition of current density. According to the charge and discharge curve of the battery, the discharge voltage of the battery is about 1.76V, and the CE, EE and VE of the battery are about 99%, 81% and 82% respectively. Within 70 cycles, the charge-discharge capacity and charge-discharge energy of the battery remained stable, and the battery performance did not show significant attenuation.

Embodiment 2

[0054] The imidazole-crosslinked chloromethylated polysulfone porous ion-conducting membrane (CMPSF-Im) of branched chain nitrogen-containing heterocycles, the battery test conditions are consistent with the battery test conditions assembled with POD membranes. It can be seen from the charge-discharge curve of the battery that the polarization of the battery is lower than that of a single cell assembled with a POD membrane. Therefore, in addition to having high ion selectivity (CE~99%), its ion conductivity is also high, and its VE is about 82%. . This may be because the pore structure in the porous membrane is conducive to the liquid holdup in the membrane and thus to the ion conduction. Within more than 100 cycles, the charge and discharge capacity and charge and discharge energy of the battery remained stable, showing good stability and battery performance.

Embodiment 3

[0056] The 4,4'-bipyridine cross-linked chloromethylated polysulfone ion-exchange membrane (CMPSF-Biy) with branched nitrogen-containing heterocyclic rings, the battery test conditions are consistent with the battery test conditions assembled with POD membranes. According to the charging and discharging curve of the battery, the polarization of the battery is higher than that of the single battery assembled with POD film, and the VE of the single battery assembled with it is about 78%, and the CE is about 99%. Although the VE of this type of film is low in alkaline zinc-iron batteries, the battery assembled with it has good cycle stability. After more than 100 cycles, the charge-discharge capacity and charge-discharge energy of the battery remain stable.

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Abstract

The invention relates to an alkaline zinc-iron flow battery, wherein an ion conduction membrane is prepared from an aromatic polymer containing nitrogen heterocycle, electrodes are carbon felt or carbon paper, a positive electrode electrolytic solution is the mixed aqueous solution of ferrocyanide and strong alkali, a negative electrode electrolytic solution is the mixed aqueous solution of a zincsalt or / and a zinc oxide and strong alkali, the concentrations of the strong alkalis in the positive electrode electrolytic solution and the negative electrode electrolytic solution are 0.001-10 mol / L, and the concentrations of the active substances in the positive electrode electrolytic solution and the negative electrode electrolytic solution are 0.001-3 mol / L. According to the present invention, a class of the alkaline zinc-iron flow batteries with characteristics of high energy density, high power density and long service life are provided, wherein the performance of the batteries is comparable to or superior to the current mature all-vanadium flow batteries, and the batteries have good application prospect.

Description

Technical field [0001] The present invention relates to the field of liquid flow batteries, and in particular to the technical field of zinc-iron liquid flow batteries. Background technique [0002] Flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has flexible system design, large storage capacity, free site selection, high energy conversion efficiency, deep discharge capability, safety and environmental protection, and low maintenance costs. With such advantages, it can be widely used in wind energy, solar energy and other renewable energy power generation and energy storage, emergency power systems, backup power stations and power system peak shaving and valley filling. All-vanadium flow battery (VFB) is considered to have good application prospects due to its high safety, good stability, high efficiency, long life (life >15 years), low cost, etc., but the electrolyte of VFB The solution is relatively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/083H01M8/18H01M4/96H01M2/16H01M8/04791H01M50/411
CPCH01M4/96H01M8/0482H01M8/083H01M8/188H01M2300/0014H01M50/411Y02E60/50Y02E60/10
Inventor 李先锋张华民袁治章段寅琦谢聪鑫
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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