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Vanadium battery negative electrolyte and method for reducing viscosity of vanadium battery negative electrolyte

A negative electrode electrolyte and vanadium battery technology, applied in the field of vanadium chemical industry, can solve the problems of reducing the flow rate of the electrolyte, affecting the diffusion process of vanadium ions, and increasing the pressure difference, so as to improve the charge and discharge performance, improve the electrochemical activity, and reduce the viscosity. Effect

Inactive Publication Date: 2017-02-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high viscosity of the electrolyte not only affects the diffusion process of vanadium ions and reduces the electrochemical activity of the electrolyte; it also reduces the flow rate of the electrolyte during operation and increases pump consumption; what is more serious is the gap between the inlet and outlet of the stack electrolyte. The pressure difference increases, which increases the risk of stack leakage

Method used

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  • Vanadium battery negative electrolyte and method for reducing viscosity of vanadium battery negative electrolyte

Examples

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Effect test

example 1

[0027] The total vanadium concentration of the vanadium battery negative electrode electrolyte is 2.0mol / L, the concentration of sulfuric acid is 3mol / L, weigh 0.006mol of citric acid, and add 0.003mol of glutamic acid into 150mL of trivalent vanadium electrolyte to dissolve, at 30℃ The viscosity of the electrolyte was detected with an Ubbelohde viscometer under the same conditions, and the experimental results are shown in Table 1.

[0028] Place the above-mentioned trivalent vanadium battery electrolyte with additives in the negative electrode liquid storage tank of the vanadium battery, take 150 mL of the tetravalent electrolyte with a total vanadium concentration of 2.0 mol / L and a sulfuric acid concentration of 3 mol / L in the positive electrode liquid storage tank , Carried out charge and discharge experiments, the experimental results are shown in Table 2.

example 2

[0030] The total vanadium concentration of the vanadium battery negative electrode electrolyte is 2.0mol / L, the concentration of sulfuric acid is 3mol / L, weigh 0.002mol of oxalic acid, and add 0.9g of polyacrylic acid into 150mL of trivalent vanadium electrolyte to dissolve, and at 30°C The viscosity of the electrolyte was detected with an Ubbelohde viscometer, and the experimental results are shown in Table 1.

[0031] Place the above-mentioned trivalent electrolyte with additives in the negative electrode liquid storage tank of the vanadium battery, take 150 mL of the total vanadium concentration as 2.0mol / L, and place the tetravalent electrolyte with a sulfuric acid concentration of 3mol / L in the positive electrode liquid storage tank, and carry out The charging and discharging experiments, the experimental results are shown in Table 2.

example 3

[0033] The total vanadium concentration of the vanadium battery negative electrode electrolyte is 2.0mol / L, the concentration of sulfuric acid is 3mol / L, weigh 0.009mol succinic acid, 0.009mol glutamic acid and add it to 150mL trivalent vanadium electrolyte to dissolve, and the Next, the viscosity of the electrolyte was detected with an Ubbelohde viscometer, and the experimental results are shown in Table 1.

[0034] Place the above-mentioned trivalent electrolyte with additives in the negative electrode liquid storage tank of the vanadium battery, take 150 mL of the total vanadium concentration as 2.0mol / L, and place the tetravalent electrolyte with a sulfuric acid concentration of 3mol / L in the positive electrode liquid storage tank, and carry out The charging and discharging experiments, the experimental results are shown in Table 2.

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Abstract

The invention provides a vanadium battery negative electrolyte and a method for reducing viscosity of the vanadium battery negative electrolyte. The vanadium battery negative electrolyte contains vanadium ions, sulfuric acid and water, wherein the vanadium ions are divalent and / or trivalent vanadium ions; the vanadium battery negative electrolyte further comprises an additive, wherein the additive contains functional groups -NH2 and / or -COOH, and concentration of the additive is 0.05%-5% of that of the vanadium ions in the vanadium battery negative electrolyte. The method comprises the step that the additive is added to the vanadium battery negative electrolyte. The additive is added to the vanadium battery negative electrolyte, so that the viscosity of the vanadium battery negative electrolyte can be obviously reduced, and electrochemical activity of the electrolyte can be improved; with the application of the electrolyte to the vanadium battery, charge-discharge performance can be effectively improved, and pump consumption during circular flowing of the electrolyte is reduced.

Description

technical field [0001] The invention relates to the field of vanadium chemical industry, in particular to a vanadium battery negative electrode electrolyte and a method for reducing its viscosity. Background technique [0002] The vanadium battery stores electrical energy in the form of chemical energy in the sulfuric acid solution of vanadium ions in different valence states. The electrolytic hydraulic pressure is injected into the battery through a pump, so that it can circulate in the positive and negative chambers respectively, and charge and discharge are completed on the electrode surface. process. The positive electrode electrolyte is composed of V(IV) and V(V) solutions, and the negative electrode electrolyte is composed of V(II) and V(III) solutions. During the charging and discharging process of the vanadium battery, the viscosity of the electrolyte has a significant impact on the performance of the battery. The high viscosity of the electrolyte not only affects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0011Y02E60/50
Inventor 韩慧果
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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