Method for Improving the Stability of High Concentration Negative Electrolyte in Operation of All-vanadium Redox Flow Battery

An all-vanadium redox flow battery and negative electrode electrolyte technology, which is applied in the direction of regenerative fuel cells, can solve the problems of affecting battery stability, easy to block batteries and pipelines, and battery capacity reduction, and achieve controllable reaction speed and low price , the effect of improving stability

Active Publication Date: 2021-06-29
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

The supporting electrolyte used in the all-vanadium redox flow battery is an aqueous solution of sulfuric acid, and trivalent vanadium ions are easy to precipitate at a high proton concentration, which not only leads to a decrease in battery capacity, but also easily blocks the battery and pipelines, affecting the long-term operation of the battery. stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An all-vanadium redox flow battery experiment was carried out with an electrolyte composed of positive and negative electrodes with a vanadium ion concentration of 2 mol / L and a sulfuric acid concentration of 2 mol / L. The positive and negative electrolyte volumes were 200 mL respectively. + Concentration is 6mol / L, adds the ammoniacal liquor of appropriate mass concentration 28% wherein, the H + The concentration drops to 4.8mol / L, and the battery continues to run. When the battery runs to 400 cycles, the negative electrode H is detected. + The concentration is 5.4mol / L. The experimental results show that the battery can still operate normally after 400 cycles, and the performance has no obvious attenuation. The battery performance is shown in Table 1

[0022] Table 1 Battery performance before and after adding stabilizer ammonia water

[0023] Coulombic efficiency voltage efficiency energy efficiency initial 97％ 86％ 83％ After 150 cycles 9...

Embodiment 2

[0025] The all-vanadium redox flow battery experiment was carried out with the positive and negative electrodes having a vanadium ion concentration of 2 mol / L and a sulfuric acid concentration of 2 mol / L. The positive and negative electrolyte volumes were 200 mL respectively. + Concentration is 5.7mol / L, add appropriate amount of aluminum hydroxide to it, H + When the concentration drops to 4.2mol / L, the battery continues to run. When the battery runs to 450 cycles, the negative electrode H is detected. + The concentration is 5mol / L. The experimental results show that the battery can still operate normally after 450 cycles, and the performance has no obvious attenuation. Battery performance is shown in Table 2

[0026] Table 2 Battery performance before and after adding stabilizer aluminum hydroxide

[0027] Coulombic efficiency voltage efficiency energy efficiency initial 97％ 87％ 84％ After 100 cycles 97％ 86％ 83％ After adding aluminum hydr...

Embodiment 3

[0029] The all-vanadium redox flow battery experiment was carried out with the positive and negative electrodes having a vanadium ion concentration of 3 mol / L and a sulfuric acid concentration of 1.8 mol / L. The positive and negative electrolyte volumes were 200 mL respectively. h + Concentration is 5.5mol / L, and appropriate amount of rubidium hydroxide is added thereinto, and H + The concentration drops to 4mol / L, and the battery continues to run. When the battery runs to 200 cycles, the negative electrode H is detected. + The concentration is 4.8mol / L. The experimental results show that the battery can still operate normally after 200 cycles, and the performance has no obvious attenuation. The battery performance is shown in Table 3

[0030] Table 3 Battery performance before and after adding stabilizer rubidium hydroxide

[0031] Coulombic efficiency voltage efficiency energy efficiency initial 98％ 86％ 84％ After 70 cycles 98％ 85％ 83％ Af...

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Abstract

The invention relates to a method for improving the stability of a high-concentration negative electrode electrolyte during the operation of an all-vanadium redox flow battery. The soluble alkaline substance is ammonia water with a mass concentration of 20-35%, sodium hydroxide, potassium hydroxide, aluminum hydroxide, hydrogen At least one of lithium oxide and rubidium hydroxide. The high-concentration negative electrode electrolyte is divalent and / or trivalent vanadium sulfuric acid aqueous solution, wherein the vanadium ion concentration is 1.6-4mol / L, and the sulfuric acid concentration is 0.5-3mol / L. The stabilizer used in the present invention to improve the stability of the high-concentration negative electrode electrolyte can make the H in the high-concentration negative electrode electrolyte in a short time + The concentration returns to the normal level, and the stability of the high-concentration negative electrode electrolyte is improved; the raw materials used in the present invention have wide sources, low price, simple process operation, controllable reaction speed, and can ensure long-term high-efficiency and stable operation of the battery.

Description

technical field [0001] The invention relates to the application of an electrolytic solution in an all-vanadium redox flow battery. 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 technology. Vanadium redox flow battery (VFB) has be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 孙佳伟李先锋张华民史丁秦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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