All-vanadium redox flow battery cathode electrolyte containing additive

A technology of all-vanadium redox flow battery and positive electrolyte, which is applied in the direction of battery electrodes, electrolytes, regenerative fuel cells, etc., can solve the problems of increasing the cost of VFB system, low system energy density, etc., achieve stable operation and improve high temperature thermal stability properties, and the effect of improving the coordination environment

Active Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the thermal management system usually brings up to 20% extra energy loss, and also increases the cost of the whole VFB system
In addition, the low solubility of pentavalent vanadium ions in the cathode electrolyte limits the system energy density of the VFB to some extent (-1 ) improvement

Method used

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  • All-vanadium redox flow battery cathode electrolyte containing additive
  • All-vanadium redox flow battery cathode electrolyte containing additive
  • All-vanadium redox flow battery cathode electrolyte containing additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Prepare 1.8M pentavalent vanadium solution by electrolysis, add 1mM, 2mM and 5mM ammonium paratungstate to 10mL pentavalent vanadium solution respectively, mix thoroughly and stir evenly, and place together with the blank 1.8M pentavalent vanadium solution sample in a water bath at 50°C Heated in medium temperature, observed the state of the solution, and investigated the effect of different additions of ammonium paratungstate on the thermal stability of pentavalent vanadium.

[0015] Table 1 The effect of different contents of ammonium paratungstate on the stability of the electrolyte

[0016]

[0017]

[0018] The mechanism of action of additives is the focus of many research works. When pentavalent vanadium is placed in a high-temperature water bath environment, the blank pentavalent vanadium solution quickly produces red V 2 o 5 precipitation. However, the stability time of pentavalent vanadium added with ammonium paratungstate is extended with the increase ...

Embodiment 2

[0020] To 60mL catholyte (1.6M VOSO 4 +3M H 2 SO 4 ) was added into 5mM ammonium paratungstate, stirred evenly and completely dissolved to prepare the electrolyte solution to be tested. Electrolyte containing ammonium paratungstate and blank electrolyte (1.6M VOSO 4 +3M H 2 SO 4 ) as the positive electrode electrolyte, 60mL of 1.6M V 3+ +3M H 2 SO 4 It is used as the negative electrode electrolyte to assemble two all-vanadium redox flow cells. Among them, the battery separator is Nafion115 (Dupont), and the effective area of ​​the membrane is 48cm 2 , the electrode is activated carbon felt, the bipolar plate is graphite plate, and the current density is 80mA cm -2 . The single cell is charged and discharged at a constant current at 50°C, and the cut-off voltage is 1.0-1.55V, thus obtaining the following figure 1 The battery capacity decay curve shown. When the battery reaches the end of charging, due to the instability of pentavalent vanadium ions in the electrolyt...

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Abstract

The invention relates to an all-vanadium redox flow battery cathode electrolyte containing additive. The additive is one or more than two of ammonium tungstate, ammonium molybdate, ammonium niobate, ammonium tantalite, ammonium paratungstate, ammonium paramolybdate, ammonium paraniobate, ammonium metatungstate, ammonium metamolybdate, ammonium metaniobate, ammonium dimolybdate, ammonium tetramolybdate and ammonium fluoroniobate. The concentration of the additive is 0.01mol / L-0.5mol / L. According to the electrolyte, salt is taken as the cathode electrolyte additive, so the capacity fading problem generated when a battery operates under a high temperature condition can be effectively suppressed, and the stable operation of the battery is realized. The electrolyte is simple in preparation technology operation and low in cost, is energy-saving and environment-protective and can operate in the battery stably.

Description

technical field [0001] The invention relates to the application of electrolyte stability in the field of all-vanadium redox flow battery energy storage technology, in particular to an all-vanadium redox flow battery electrolyte containing additives. 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 relia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M4/86
CPCH01M4/86H01M8/18H01M2300/00Y02E60/50
Inventor 孙佳伟张华民李先锋刘涛史丁秦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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