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Vanadium electrolyte of battery and preparation method thereof

An electrolyte and vanadium battery technology, applied in the field of vanadium battery electrolyte and its preparation, can solve the problems of no charge and discharge test report, low test current density, valence mismatch and accumulation, etc.

Inactive Publication Date: 2012-03-14
BIG PAWER ELECTRICAL TECH XIANGYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents ZL200610047226.2 and ZL200510075608.1 respectively disclose the research on additives, but the above patents either do not give a specific charge and discharge test report, or the test current density is too small to explain the problem
However, due to the strong oxidation and strong acidity of the positive electrolyte system, these substances themselves are excluded because of their long-term stability, which limits the selection of substances.
Therefore, the additives used in the prior art can not completely solve the problem of improving the stability and activity of the vanadium electrolyte and avoiding the phenomenon of valence mismatch accumulation.

Method used

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  • Vanadium electrolyte of battery and preparation method thereof
  • Vanadium electrolyte of battery and preparation method thereof
  • Vanadium electrolyte of battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1.8M vanadyl sulfate-sulfuric acid solution (VOSO 4 , purchased from the market) added to 3M's H 2 SO 4100 mL of a blank electrolyte solution with a vanadium ion concentration of 2.0 M was prepared. At room temperature, add 0.3 g of acesulfame K, the concentration of which is 1.0% by mass, and keep stirring until the acesulfame K is completely dissolved. The acesulfame potassium used in this embodiment is purchased from the market. Through the above steps, the electrolyte solution for vanadium battery provided by the invention is prepared.

[0027] The above-mentioned electrolyte is placed in the positive and negative electrolyte storage tanks of the vanadium battery respectively according to the ratio of volume ratio 2: 1, with graphite felt as the electrode, and the cation exchange membrane (perfluorosulfonic acid membrane) as the battery diaphragm. The current density is 30-80mA / cm 2 The charge-discharge activation is carried out at a current density of 1.5 mol / ...

Embodiment 2

[0031] With 1.8M VOSO 4 solution with 3M H 2 SO 4 500mL of the solution is the electrolyte, placed in the cathode of the electrolytic cell, with 3mol / L sulfuric acid system as the anode, the electrode material is a lead plate, and the perfluorosulfonic acid ion exchange membrane is the diaphragm, at 60-250mA / cm 2 Charging is carried out under the current density, and at the same time, 3.5 g of acesulfame potassium is added to the cathode of the electrolytic cell for electrolysis, and its mass concentration is 2.4%. The end point of electrolysis is controlled by detecting the potential of the electrolyte, the end point potential is 150-250Mv, and the vanadium ion concentration of 1.6mol / L is obtained for the positive and negative electrodes of the all-vanadium redox flow battery. 3+ / V 4+ electrolyte. The obtained electrolyte is used in a vanadium battery, at a certain 50mA / cm 2 The battery was charged and discharged under the current density. The initial discharge voltage...

Embodiment 3-7

[0033] Table 1 shows the addition method adopted in Examples 3-7, the type and concentration of the addition, and the battery performance obtained from the test.

[0034] Table 1

[0035]

[0036] It can be seen from the above data and drawings that the present invention has the advantage of selecting a class of water-soluble organic additives to improve the activity of the electrolyte and the reversibility of redox reactions. Moreover, the selected additives are low in dosage, easy to obtain, and low in cost; the additive itself has good stability, high water solubility, and good stability to heat and acid, thereby improving the cycle stability of the electrolyte, suppressing battery capacity decay, and reducing Electrolyte sensitivity to temperature.

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Abstract

The invention provides an electrolyte. The electrolyte comprises vanadium ions, sulfuric acid, and an azine compound which is adopted as an additive, wherein the mass concentration of the additive in the electrolyte is 0.01-5.0%. The invention also provides a preparation method of the electrolyte. The addition of the additive allows the oxidation reduction reaction reversibility of effective substances in the electrolyte to be improved, and is in favor of maintaining the stability of the vanadium electrolyte in the charging and discharging operation of a battery.

Description

technical field [0001] The invention relates to the field of battery electrolytes, in particular to a vanadium battery electrolyte and a preparation method thereof. Background technique [0002] Since the energy of the vanadium battery depends on the volume and concentration of the electrolyte, increasing the concentration of the electrolyte of the vanadium battery can increase the energy density of the vanadium battery. However, because the valence electron layer structure of vanadium is 3d34s2, there are spare d orbitals, which are easy to combine with ligands, and the association between vanadium atoms is also very easy. The greater the concentration of the solution, the greater the degree of association between vanadium atoms. The complex large particles formed after the association participate in the electrochemical reaction, and the corresponding reaction energy barrier increases, resulting in increased polarization and slower reaction speed, and the increase in conce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 仲晓玲刘素琴张庆华覃定员李茜李君涛李虹云刘维维
Owner BIG PAWER ELECTRICAL TECH XIANGYANG
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