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Alkaline zinc-iron electrochemical flow cell

A liquid flow battery, zinc-iron technology, applied in the direction of alkaline electrolyte, fuel cell, battery electrode, etc., can solve the problems of increasing battery maintenance cost, battery voltage efficiency drop, battery energy efficiency attenuation, etc., to reduce electrolyte migration problems, system maintenance cost reduction, effect of high open circuit voltage

Active Publication Date: 2019-03-22
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

The positive electrolyte of the existing alkaline zinc-iron redox flow battery uses an alkaline solution of ferrocyanide, and the negative electrolyte uses a solution of zinc salt or zinc oxide dissolved in a strong alkali. The battery of this electrolyte system During the operation, due to the inconsistency of the osmotic pressure of the positive and negative electrolytes, the electrolyte migration is serious, which leads to the decrease of the battery voltage efficiency, which leads to the attenuation of the battery energy efficiency and greatly increases the maintenance cost of the battery.
At the same time, the negative electrode of the alkaline zinc-iron flow battery will deposit and dissolve zinc on the electrode, and serious zinc dendrites or dendrite-like deposits will be generated when operating under high current density conditions, resulting in a short circuit of the battery.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0045] For a symmetrical alkaline zinc-iron flow battery, the solute composition of the positive electrolyte (aqueous solution) is 0.4mol L -1 Potassium ferrocyanide+0.2mol L -1 Zn(OH) 4 2- +3mol L -1 KOH; negative electrode electrolyte (aqueous solution) solute composition is 0.4mol L -1 Potassium ferrocyanide+0.2mol L -1 Zn(OH) 4 2- +3mol L -1 KOH; the positive and negative electrolyte volumes are 100mL each; the positive and negative electrodes are porous carbon felt electrodes, and the graphite plate is used as a current collector; the ion-conducting membrane is a polybenzimidazole ion-conducting membrane; at 80mA cm -2 Charge for 12min under the condition of the current density, and then cut off the voltage as the condition, 80mA cm -2 Discharge to 0.1V under the condition of current density. At the end of the discharge, measure the volume of the positive and negative electrolytes, from figure 2 It can be seen that within 600 cycles of this symmetrical alkaline...

Embodiment 2

[0050] For a symmetrical alkaline zinc-iron flow battery, the solute composition of the positive electrolyte (aqueous solution) is 0.2mol L -1 Potassium ferrocyanide+0.1mol L -1 Zn(OH) 4 2- +1mol L -1 KOH; negative electrode electrolyte (aqueous solution) solute composition is 0.4mol L -1 Potassium ferrocyanide+0.1mol L -1 Zn(OH) 4 2- +1mol L -1 KOH; the positive and negative electrolyte volumes are 100mL each; the positive and negative electrodes are porous carbon felt electrodes, and the graphite plate is used as a current collector; the ion-conducting membrane is a polybenzimidazole ion-conducting membrane; at 100mAcm -2 Charge for 10min under the condition of the current density, and then cut off the voltage as the condition, 100mA cm -2 Discharge to 0.1V under the condition of current density. Measure the volume of positive and negative electrolyte at the end of discharge. After 481 cycles, the volume of negative electrolyte is 95mL, and the volume of positive el...

Embodiment 3

[0054] For a symmetrical alkaline zinc-iron flow battery, the solute composition of the positive electrolyte (aqueous solution) is 0.6mol L -1 Potassium ferrocyanide+0.3mol L -1 Zn(OH) 4 2- +3mol L -1 KOH; negative electrode electrolyte (aqueous solution) solute composition is 0.6mol L -1 Potassium ferrocyanide+0.3mol L -1 Zn(OH) 4 2- +3mol L -1 KOH; the positive and negative electrolyte volumes are 100mL each; the positive and negative electrodes are porous carbon felt electrodes, and the graphite plate is used as a current collector; the ion-conducting membrane is a polybenzimidazole ion-conducting membrane; at 80mA cm -2 Charge for 15min under the current density condition, and then cut off the voltage as the condition, 80mA cm -2 Discharge to 0.1V under the condition of current density. Measure the volume of the positive and negative electrolytes at the end of discharge. After 527 cycles, the volume of the negative electrolyte is 92mL, and the volume of the positi...

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Abstract

The invention relates to an alkaline zinc-iron electrochemical flow cell. The alkaline zinc-iron electrochemical flow cell is composed of a battery module, an electrolyte storage tank, a circulating pump and a circulation pipeline, wherein the battery module is formed by connecting one single battery or more than two single batteries in series / in parallel; a positive electrode and a negative electrode adopt the same electrolyte, strong alkali serves as supporting electrolyte, carbon felts or carbon paper serves as the electrodes, a graphite plate serves as a current collecting plate to form the symmetric electrochemical flow cell; and the electrolyte of each of the positive electrode and the negative electrode is a mixed aqueous solution of ferrocyanide, zinc salt or / and zinc oxide and thestrong alkali. The symmetric alkaline zinc-iron electrochemical flow cell with the positive electrode and the negative electrode adopting the same electrolyte has the battery performance equivalent to that of a traditional alkaline zinc-iron electrochemical flow cell, meanwhile, due to the fact that the positive electrode and the negative electrode adopt the same electrolyte, the osmotic pressureof the electrolyte of the positive electrode and the electrolyte of the negative electrode is consistent, and therefore the problem of electrolyte migration caused by inconsistent osmotic pressure ofthe electrolyte of the positive electrode and the electrolyte of the negative electrode of the traditional alkaline zinc-iron electrochemical flow cell can be solved, and the maintenance cost of a system in the actual application process is effectively lowered.

Description

technical field [0001] The invention relates to the field of flow batteries, in particular to the technical field of alkaline zinc-iron flow batteries. Background technique [0002] Liquid flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has the advantages of flexible system design, large storage capacity, free site selection, high energy conversion efficiency, 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. Due to the advantages of high safety, good stability, high efficiency, long life (life > 15 years), and low cost, all-vanadium redox flow batteries are considered to have good application prospects, but the electrolyte of VFB is expensive, which is To some extent, its ...

Claims

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Application Information

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IPC IPC(8): H01M8/083H01M8/18H01M4/96H01M8/04791
CPCH01M4/96H01M8/0482H01M8/083H01M8/188H01M2300/0014Y02E60/50
Inventor 李先锋袁治章张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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