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Organic positive electrode active material for aqueous redox flow battery

一种正极活性材料、液流电池的技术，应用在水性电解质燃料电池、电池电极、水性电解质等方向，能够解决溶质密度降低等问题，达到高能量密度、高工作电压、提高能量效率的效果

Active Publication Date: 2019-03-01
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to these characteristics, there is a problem with sulfuric acid-based electrolytes used in all-vanadium redox flow batteries that, due to this precipitation, the solute density, which is directly related to capacity, decreases
For applications in medium / large power storage systems where high capacity, long life, and high stability are considered important factors, it has been pointed out that the low operating voltage and narrow temperature range used become serious problems for all-vanadium redox flow batteries. defect

Method used

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  • Organic positive electrode active material for aqueous redox flow battery
  • Organic positive electrode active material for aqueous redox flow battery
  • Organic positive electrode active material for aqueous redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0047] Dissolve 0.4M 4-aminophenol in 3.0M H 2 SO 4 aqueous solution to prepare the positive electrode electrolyte.

experiment example 1

[0049] In order to detect the redox characteristics of the catholyte prepared in Example 1, cyclic voltammetry was performed using glassy carbon, Ag / AgCl and platinum (Pt) wires as working electrode, reference electrode and counter electrode, respectively. The current values ​​measured on the working electrode were recorded when a voltage of -0.6 V to 1.2 V was applied to the working electrode at different scan rates ranging from 50 mV / s to 200 mV / s. The results are shown in figure 1 middle.

[0050] result

[0051] refer to figure 1 , from the results evaluated by cyclic voltammetry, it can be seen that as the scan rate increases, the oxidation / reduction current peak value increases, and since two peaks are observed during the reduction process, it is 2e - reaction. These results demonstrate that reversible redox reactions can proceed in acidic aqueous solutions.

[0052] also, figure 2 are the images of 4-aminophenol aqueous solution before and after the cyclic volt...

Embodiment 1

[0054] The use size is 5×5cm 2 carbon felt, bipolar plates, and gold current collectors to fabricate the positive and negative electrodes. In this case, Nafion 115 was used as the ion exchange membrane.

[0055] The electrolytic solution prepared in Preparation Example 1 was used as the positive electrode electrolytic solution. For the negative electrode electrolyte, 1.0M vanadium sulfate (VOSO 4 ) dissolved in 3.0M sulfuric acid aqueous solution (H 2 SO 4 ) to prepare tetravalent vanadium (VO 4+ ) solution, and this solution is electroreduced to form trivalent vanadium ions (V 3+ ), and use the .

[0056] A redox flow battery was fabricated using the battery thus assembled, the anode electrolyte, and the cathode electrolyte prepared in Example 1. In this case, the electrolytic solution was circulated at a rate of 25 cc / min using a pump.

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Abstract

The present invention relates to an organic positive electrode active material for an aqueous redox flow battery and, more specifically, to a technique for remedying the disadvantages of a conventional aqueous redox flow battery by utilizing an organic positive electrode active material. The aqueous redox flow battery utilizing the positive electrode active material according to the present invention does not have the problem of metal precipitation and can be used at a high concentration due to an increase in solubility depending on the solvent, and thus, can not only achieve high energy density, but can also obtain a high operating voltage, and can increase energy efficiency. In addition, since an expensive organic electrolyte does not have to be used, economic feasibility is excellent.

Description

technical field [0001] This application claims priority and benefit from Korean Patent Application No. 10-2016-0121644 filed with the Korean Intellectual Property Office on September 22, 2016, the disclosure of which is incorporated herein by reference in its entirety. [0002] The present invention relates to an organic positive electrode active material for an aqueous redox flow battery, and more particularly, to a technique of applying the organic positive electrode active material to compensate for the disadvantages of conventional aqueous redox flow batteries. Background technique [0003] Redox flow batteries have attracted much attention as economically viable and long-lived secondary batteries. Unlike conventional secondary batteries using lithium and sodium, a redox flow battery has a capacity expression mechanism in which the battery progresses through a redox reaction of each active material in the positive and negative electrodes in a state where each active mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M8/20H01M4/60
CPCH01M8/188H01M4/60Y02E60/50Y02E60/10H01M8/20H01M2300/0002C07C205/22C07C215/76H01M4/368H01M8/08H01M2004/028
Inventor 边修真金成妍郑奉铉鲁台根李政倍康爱德
Owner LG CHEM LTD