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Negative electrode electrolyte for alkaline zinc-based flow battery as well as preparation and application of negative electrode electrolyte

An anode electrolyte, flow battery technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of increasing battery maintenance costs, decreasing battery energy efficiency, and decreasing battery voltage efficiency, achieving easy purchase and high safety. performance, low cost

Active Publication Date: 2020-05-26
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

[0003] For example, the positive electrolyte of the existing alkaline zinc-iron 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 electrolyte system During the operation of the battery, due to the inconsistent osmotic pressure of the positive and negative electrolytes, the water migration caused by ion migration is irreversible, resulting in serious electrolyte migration, which leads to a decrease in battery voltage efficiency, which in turn leads to attenuation of battery energy efficiency, which greatly increases the battery life. maintenance cost
At the same time, during the charging and discharging process of the alkaline zinc-iron flow battery, the deposition and dissolution of zinc on the negative side of the electrode will occur, and serious zinc dendrites or dendrite-like deposits will be generated when operating under high current density conditions. Crystals can pierce the separator, causing a short circuit in the battery

Method used

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  • Negative electrode electrolyte for alkaline zinc-based flow battery as well as preparation and application of negative electrode electrolyte
  • Negative electrode electrolyte for alkaline zinc-based flow battery as well as preparation and application of negative electrode electrolyte
  • Negative electrode electrolyte for alkaline zinc-based flow battery as well as preparation and application of negative electrode electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0040] The same test conditions for the alkaline zinc-iron flow battery in Examples 1-5: electrode effective area: 48cm 2 ; The battery adopts constant current charging and discharging mode, at 80mA cm -2 Charge for 18min under the condition of the current density, and then the voltage cut-off condition, 80mAcm -2 Discharge to 0.1V under the condition of current density; positive electrode electrolyte composition: 0.8mol L -1 Fe(CN) 6 4- +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. The difference is the composition of the negative electrode electrolyte, the specific situation is as follows:

[0041] Example Negative Electrolyte Composition Example 1 0.4mol L -1 Zn(OH) 4 2- +3mol L -1 KOH+0.3mol L -1 glucose

[0...

Embodiment 1

[0044] For alkaline zinc-iron flow batteries with organic additives, the positive electrolyte composition is 0.8mol L -1 Fe(CN) 6 4- +3mol L -1 KOH; negative electrode electrolyte composition is 0.4mol L -1 Zn(OH) 4 2- +3mol L -1 KOH+0.3mol L -1 Glucose; the positive and negative electrolyte volumes are 80mL each; the positive and negative electrodes are porous carbon felt electrodes, and graphite plates are used as current collectors; the ion-conducting membrane is polybenzimidazole ion-conducting membrane; at 80mA cm -2 Charge for 18min 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 402 cycles, the volume of the negative electrolyte is 90mL, the volume of the positive electrolyte is 70mL, and the electrolyte migration is small. At the same time, after more than 635 charge ...

Embodiment 2

[0046] For alkaline zinc-iron flow batteries with organic additives, the positive electrolyte composition is 0.8mol L -1 Fe(CN) 6 4- +3mol L -1 KOH; negative electrode electrolyte composition is 0.4mol L -1 Zn(OH) 4 2- +3mol L -1 KOH+0.5mol L -1 Glucose; the positive and negative electrolyte volumes are 80mL each; the positive and negative electrodes are porous carbon felt electrodes, and graphite plates are used as current collectors; the ion-conducting membrane is polybenzimidazole ion-conducting membrane; at 80mA cm -2 Charge for 18min 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. At the end of the discharge, measure the volume of the positive and negative electrolytes, such as figure 2 , the blank sample is a flow battery without additives, and the alkaline zinc-iron flow battery after adding additives to the negative electrolyte has no significant change in...

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Abstract

The invention relates to a negative electrode electrolyte for an alkaline zinc-based flow battery as well as preparation and application of the negative electrode electrolyte. The negative electrode electrolyte is a supramolecular complex solution formed by blending a zinc precursor, an organic additive and strong alkali, wherein the organic additive is micromolecular saccharides, micromolecular alcohols or a compound of the micromolecular saccharides and the micromolecular alcohols, is applied to the alkaline zinc-based flow battery, effectively inhibits electrolyte migration of the alkalinezinc-based flow battery due to inconsistent osmotic pressure of positive and negative electrolytes, and greatly reduces the maintenance cost of the electrolyte in the actual use process of the battery.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage of alkaline zinc-based flow batteries, in particular to a negative electrode electrolyte for alkaline zinc-based 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. Low-level advantages, can be widely used in wind energy, solar energy and other renewable energy generation energy storage, emergency power system, backup power station and power system peak shaving and valley filling, etc. Vanadium redox flow battery (VFB) is considered to have good application prospects because of its high safety, good stability, high efficiency, long life (life > 15 years), and low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 袁治章李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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