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Novel all-vanadium redox flow battery positive electrode electrolyte and application thereof

An all-vanadium redox flow battery and positive electrolyte technology, which is applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of limited improvement in thermal stability, poor stability, and exhaustion of the positive electrolyte, achieving Low cost, improved stability, and improved concentration

Pending Publication Date: 2020-05-19
华秦储能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common way to improve the stability of the electrolyte is to add certain chemical substances to it. These chemical substances can be roughly divided into inorganic substances and organic substances. Although some inorganic substances (phosphates, halides, etc.) can exist stably in the electrolyte , but its improvement on the thermal stability of the positive electrode electrolyte is limited, which limits its application; while some organic substances (methanol, ethanol, glycerol, glucose, etc.) have a certain effect on improving the thermal stability of the positive electrode electrolyte, However, its stability in the positive electrolyte is poor, and it is easily oxidized and consumed by pentavalent vanadium ions, so it is often used as a battery capacity recovery agent (for example: CN 103035963 B, CN 103000927 A, etc.)

Method used

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  • Novel all-vanadium redox flow battery positive electrode electrolyte and application thereof
  • Novel all-vanadium redox flow battery positive electrode electrolyte and application thereof
  • Novel all-vanadium redox flow battery positive electrode electrolyte and application thereof

Examples

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Effect test

Embodiment 1

[0031] Prepare 2.5 mol / L pentavalent vanadium solution by electrolysis, and add different stabilizers to 10 mL pentavalent vanadium solution respectively. / L pentavalent vanadium solution samples were placed together in a water bath at 55 °C at a constant temperature, the state of the solution was observed, and the influence of different stabilizers on the thermal stability of pentavalent vanadium was investigated.

Embodiment 2

[0036] The VFB experiment was carried out with an electrolyte with a vanadium ion concentration of 1 mol / L, and the temperature of the electrolyte was 50 °C. The electrolyte in a group of batteries does not contain a stabilizer, and the electrolyte in a group of batteries contains 2 wt% dodecanal stabilizer. Other experimental conditions are the same, and the experiment is carried out at the same time. Experimental results such as figure 1 shown. figure 1It is a comparison chart of the discharge capacity of two groups of batteries without stabilizer and with dodecanal stabilizer. From figure 2 It can be seen from the figure that the discharge capacity of the battery containing the dodecanal stabilizer is significantly higher than that of the battery without the stabilizer, and the capacity decay rate of the battery containing the stabilizer is also slower.

Embodiment 3

[0038] The VFB experiment was carried out with an electrolyte solution with a vanadium ion concentration of 3 mol / L, and the experimental temperature was 50 °C. Containing 0.01wt% methylhexyl acetaldehyde stabilizer in the battery electrolyte, carry out experiment. After the battery has undergone 57 charge and discharge cycles, add 0.5 wt% methylhexyl acetaldehyde stabilizer to the positive electrode electrolyte again, and continue the experiment. Experimental results such as figure 2 as shown, figure 2 is the discharge capacity curve of the battery. Depend on image 3 It can be seen that when the stabilizer is added for the second time, the battery discharge capacity recovers to 95% of the initial discharge capacity.

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Abstract

The invention relates to the field of batteries, in particular to a novel all-vanadium redox flow battery positive electrode electrolyte and application thereof. The organic polymer is a chain-shapedaldehyde compound; and the content of the organic polymer in the electrolyte is 0.001 wt%-20wt%. The organic polymer is used as the stabilizer of the electrolyte, so that the stability of the electrolyte in a high-temperature environment can be effectively improved, the stable operation of the battery is realized, the concentration of vanadium ions in the electrolyte can be improved, and the energy density of the battery is improved. The preparation process disclosed by the invention is simple to operate, energy-saving, environment-friendly and low in cost, and meanwhile, stable operation of the electrolyte in the battery can be realized.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a novel anode electrolyte for an all-vanadium redox flow battery and its application. Background technique [0002] With the depletion of fossil energy all over the world and the continuous enhancement of people's awareness of environmental protection, renewable energy power generation technology is more and more popular. Renewable energy mainly includes wind energy, solar energy, biomass energy, ocean energy, etc., which are usually converted into electrical energy for use. These renewable energy power generation is obviously discontinuous and unstable due to the influence of geographical and meteorological conditions. In order to smooth and stabilize the power generation output of renewable energy, solve the time difference between power generation and power consumption, and improve power quality and grid reliability, it is necessary to develop high-efficiency energy storage technolog...

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 应忠芳郑建伟赵文超段鹏勇
Owner 华秦储能技术有限公司
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