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Neutral zinc iron double fluid flow battery

A flow battery, neutral technology, applied in the direction of regenerative fuel cells, etc., can solve the problems of restricting large-scale application, electrode and pipeline corrosion, serious alkali corrosion, etc., and achieve the effect of abundant reserves, low cost and good stability.

Active Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The former two cause environmental pollution due to the overflow of bromine element in the electrolyte on the positive electrode side, which restricts their large-scale application.
Due to the low solubility of vanadium ions, the all-vanadium system requires a high concentration of acid as a solvent, which will cause corrosion of electrodes and pipes
The electrolyte of the zinc-nickel system is a highly alkaline zincate solution, which requires a concentration of 6-14mol dm ‐3 Alkali is used as a solvent, which not only wastes resources, but also has more serious causticity of alkali

Method used

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  • Neutral zinc iron double fluid flow battery
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Embodiment Construction

[0018] Electrolyte configuration:

[0019] Electrolyte: positive electrolyte is 40ml0.4mol dm -3 K 4 Fe(CN) 6 solution; negative electrode electrolyte is 40mL0.4moldm -3 ZnSO 4 solution.

[0020] Battery Assembly:

[0021] Single cell positive terminal plate, current collector, positive electrode 3x3cm in sequence 2 Carbon felt, membrane, negative electrode 3x3cm 2 Graphite plate, negative terminal plate. Single battery structure and system see figure 1 .

[0022] Battery test:

[0023] Electrolyte flow rate: 5ml / min; charge and discharge current density 20mA / cm 2 ; Charge capacity 180mAh, discharge cut-off voltage is 0.8V. For battery performance see figure 2 , from the charge-discharge current density figure 2 It can be seen that at 20mA / cm 2 ; Under the condition of charging capacity of 180mAh, the energy efficiency of the battery has reached about 74%, and the performance of 30 cycles has not been significantly weakened.

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Abstract

The invention discloses a neutral zinc iron double fluid flow battery, a single cell comprises positive and negative electrode end plates, a collector, a positive electrode, a film, a negative electrode, positive and negative electrode liquid storage tanks, a pipeline and a pump, wherein the positive electrode is a porous electrode, the negative electrode is a deposition type electrode, a positive electrode electrolyte solution is a neutral K4Fe (CN) 6 solution, and a negative electrolyte solution is a neutral zinc-ion-containing; when in charging, the electrolyte solutions respectively pass through the positive and negative electrode liquid storage tanks to be respectively sent to the positive electrode and the negative electrode, K3Fe (CN) 6 is produced by oxidation reaction of active material K4Fe (CN) 6 in the positive electrode storage tank, and zinc ions are directly deposited in the form of elemental zinc in the negative electrode; when in discharge, K4Fe (CN) 6 is produced by reduction reaction of active material K3Fe (CN) 6 in the positive electrode electrolyte solution, and the elemental zinc is oxidized into zinc ions to return through the pump back to the negative electrode liquid storage tank. The positive and negative electrode electrolyte solutions are neutral solutions, overcome the corrosion problems caused by a strong acid and a strong alkali as support electrolytes in the traditional liquid flow battery.

Description

technical field [0001] The invention relates to the field of flow batteries, in particular to a zinc-iron flow battery. Background technique [0002] Electric energy is the energy that human beings rely on for survival. At present, electric energy mainly comes from fossil energy, and the excessive consumption of fossil energy not only causes energy shortage, but also emits a large amount of toxic and harmful gases, causing environmental pollution. Therefore, people began to pay attention to the development and utilization of renewable energy such as wind energy and solar energy. However, due to the discontinuity and instability of renewable energy such as solar energy and wind energy, if they are directly integrated into the grid, they will have an impact on the grid. Therefore, effective Utilizing these renewable energy sources requires efficient, cheap, safe and reliable energy storage equipment. On the basis of meeting the above conditions, the flow battery has become on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 张华民程元徽赖勤志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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