Silicon-containing heteropolyacid positive electrode electrolyte for all-vanadium redox flow battery

An all-vanadium redox flow battery and cathode electrolyte technology, applied in organic electrolytes, non-aqueous electrolytes, indirect fuel cells, etc., can solve the problems of limiting the application field of VFB, poor stability of system energy density, increasing cost, etc., to increase capacity. Retention rate, improved high temperature thermal stability, low cost effect

Active Publication Date: 2017-03-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But thermal management systems typically cause up to 20% additional energy loss while increasing the cost of the overall system
Therefore, the problem of poor stability of the high-concentration vanadium electrolyte limits the improvement of the energy density of the system to a certain extent, and thus limits the application field of VFB.

Method used

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  • Silicon-containing heteropolyacid positive electrode electrolyte for all-vanadium redox flow battery
  • Silicon-containing heteropolyacid positive electrode electrolyte for all-vanadium redox flow battery
  • Silicon-containing heteropolyacid positive electrode electrolyte for all-vanadium redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] To 1.0M VO 2 + / 3M H 2 SO 4 Slowly add 0.01M silicotungstic acid to the blank cathode electrolyte, and carry out NMR tests on the blank sample and the pentavalent vanadium sample with additives respectively. It can be concluded from the analysis of NMR spectra that after the addition of silicotungstic acid, the original blank The NMR unimodal peak pattern corresponding to pentavalent vanadium ions changed significantly, indicating that the additive silicotungstic acid interacted with pentavalent vanadium ions, which changed the coordination environment of pentavalent vanadium.

Embodiment 2

[0019] Prepare 1.8M pentavalent vanadium solution by electrolysis, add 0.016M, 0.03M and 0.04M silicotungstic acid to 10mL pentavalent vanadium solution respectively, mix well, stir evenly, and place together with blank 1.8M pentavalent vanadium solution sample Heated in a water bath at 80°C, observed the state of the solution, and investigated the effects of different additions of silicotungstic acid on the thermal stability of pentavalent vanadium.

[0020] Table 1 The impact of different content additives on the stability of the electrolyte

[0021]

[0022]

[0023] The mechanism of action of additives is the focus of many research works, but the difficulty of experimental observation is enhanced due to the long experimental cycle. Therefore, in order to facilitate the investigation of the influence of silicotungstic acid on the thermal stability of pentavalent vanadium in a short period of time, the thermal stability experiment was carried out by heating in a water ...

Embodiment 3

[0026] To 100mL 1.6M VOSO 4 / 3M H 2 SO 4 Add 0.03mol silicotungstic acid solution to the positive electrode electrolyte, stir and dissolve fully to prepare the CV electrolyte to be tested, and use the quaternary electrolyte (1.6M VOSO 4 / 3M H 2 SO 4 ) was used as a blank solution for comparison. Cyclic voltammetry was performed using a three-electrode system (WE: graphite plate per unit area; CE: graphite plate with large area; RE: saturated calomel electrode). The scanning range is 0-1.4V, and the scanning speed is 50mV / S. From figure 2 It can be seen from the comparison that adding silicotungstic acid significantly improves the reactivity and reversibility of the electrolyte.

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Abstract

The invention relates to a positive electrode electrolyte with a silicon-containing heteropolyacid additive for an all-vanadium redox flow battery. The silicon-containing heteropolyacid additive is one or two kinds of silicotungstic acid, silicomolybdic acid, silicon niobic acid or silicon tantalic acid; and the concentration of the silicon-containing heteropolyacid as the additive is 0.01-0.5mol/L. By taking the silicon-containing heteropolyacid as the positive electrode electrolyte additive, the problem of capacity fading in the operation of the battery at a high temperature can be effectively suppressed, and the stable operation of the battery can be realized; and in addition, the positive electrode electrolyte is simple in preparation process, energy-saving and environment-friendly, low in cost, and capable of realizing stable operation of the electrolyte in the battery.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/20
CPCH01M8/20H01M2300/0025Y02E60/50
Inventor 孙佳伟张华民丁聪李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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