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Neutral zinc-iron liquid flow battery of food-grade electrolyte

A flow battery, food-grade technology, used in fuel cells, acidic electrolytes, aqueous electrolytes, etc., can solve problems such as irritation to eyes and respiratory tract, environmental and biological toxicity, biological damage, etc., to improve cycle stability and cost. Low, high safety effect

Active Publication Date: 2021-06-11
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 zinc-bromine flow battery that has entered the commercialization stage will produce bromine element during the charging process, which is highly toxic, and its smoke can strongly irritate the eyes and respiratory tract, causing great damage to organisms
At present, the electrolytes of alkaline zinc-iron flow batteries, alkaline zinc-nickel flow batteries, and alkaline all-iron flow batteries are strongly alkaline and corrosive, and have certain toxicity to the environment and organisms.
Moreover, in the currently studied organic flow battery system, the commonly used active substances viologens are highly toxic and cause great damage to the environment.

Method used

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  • Neutral zinc-iron liquid flow battery of food-grade electrolyte
  • Neutral zinc-iron liquid flow battery of food-grade electrolyte
  • Neutral zinc-iron liquid flow battery of food-grade electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The composition of positive electrode electrolyte is 1mol L -1 Ferrous gluconate+2mol L -1 NaCl; negative electrode electrolyte composition is 0.5mol L -1 Zinc gluconate+2mol L -1 NaCl; the separator is a polybenzimidazole porous ion-conducting membrane; at 40mA cm -2 Charge for 35min under the current density condition, take the capacity cut-off as the cut-off condition, and then charge at 40mA cm -2 Discharge to 0.1V under the condition of current density. It can be seen from the efficiency curve in the figure that the CE, VE and EE of the battery are 99.3%, 86.5%, and 85.6%, respectively. From Figure 5 a It can be seen that the neutral zinc-iron flow battery using ferrous gluconate as the active material in the positive electrode has no significant change in battery performance within 150 cycles. The corresponding battery runs continuously and stably for 150 cycles, and the battery capacity ( Figure 5 b) maintained well, exhibiting excellent cycle stability....

Embodiment 2

[0040] Embodiment 2 (performance under different current densities)

[0041] The composition of positive electrode electrolyte is 1mol L -1 Ferrous gluconate+2mol L -1 NaCl; negative electrode electrolyte composition is 0.5mol L -1 Zinc gluconate+2mol L -1 NaCl, the positive and negative electrolyte volumes are 60mL each; the diaphragm is a polybenzimidazole porous ion-conducting membrane; then at 40mA cm -2 , 60mA cm -2 , 80mA cm -2 , 100mA cm -2 The current density conditions were charged for 35min, 23.3min, 17.5min, and 14min, respectively, and then discharged to 0.1V at the corresponding current density. Depend on Figure 6 It can be seen that the modified neutral zinc-iron flow battery has better performance at different current densities, which proves that the battery can operate stably at different current densities.

Embodiment 3

[0042] Embodiment 3 (performance under different temperatures)

[0043] The composition of positive electrode electrolyte is 1mol L -1 Ferrous gluconate+2mol L -1 NaCl; negative electrode electrolyte composition is 0.5mol L -1 Zinc gluconate+2mol L -1 NaCl, the positive and negative electrolyte volumes are 60mL each; the diaphragm is a polybenzimidazole porous ion-conducting membrane; at 40mA cm -2 Charge for 35min under the current density condition, take the capacity cut-off as the cut-off condition, and then charge at 40mA cm -2 Discharge to 0.1V under the condition of current density. Operating at 25°C, 35°C, 45°C, and 55°C respectively, the performance of the battery is shown in the figure. Depend on Figure 7 It can be seen that the battery has good performance at different temperatures, which indicates that the battery can operate stably at different temperatures.

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Abstract

The invention relates to a neutral zinc-iron liquid flow energy storage battery applicable to the field of electrochemical energy storage. The positive electrolyte is a sodium chloride aqueous solution of a soluble iron supplement agent, the negative electrolyte is a sodium chloride aqueous solution of a soluble zinc supplement agent, sodium chloride is used as a supporting electrolyte, and substances in the electrolyte can be food-grade. The zinc supplement agent and the iron supplement agent generally have complex anions, so that the zinc supplement agent and the iron supplement agent exist in the forms of a zinc ion complex and an iron ion complex after being dissolved in water, complex ions, ferrous ions and iron ions can generate stable chelates, hydrolysis of divalent and trivalent iron ions is inhibited, and the stability of divalent and trivalent iron ions in a neutral aqueous solution is greatly improved. Compared with a traditional neutral zinc-iron liquid flow battery, the liquid flow battery has the advantages that the electrolyte is harmless to a human body and can reach a food grade, and the liquid flow battery has great advantages in battery performance and shows a good application prospect.

Description

technical field [0001] The invention relates to the field of flow batteries, in particular to a neutral zinc-iron flow battery with a food-grade electrolyte. 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. Most of the currently researched flow battery systems are mostly strongly acidic and strongly alkaline systems. For example, the supporting electrolyte of the more mature all-vanadium flow battery is 3MH 2 SO 4 , The strongly acidic electrolyte not only has higher ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0005Y02E60/50
Inventor 李先锋袁治章刘晓奇张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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