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Method for preparing electrolyte for vanadium redox flow battery

A flow battery and electrolyte technology, applied in secondary batteries, regenerative fuel cells, hybrid battery parts, etc., can solve the problems of reducing the energy efficiency of vanadium batteries, blocking batteries, reducing battery energy efficiency, etc., and achieving easy scale. Effects of industrial production, increased energy density, increased energy efficiency

Inactive Publication Date: 2006-09-06
缪强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vanadyl sulfate solution with high concentration is easy to precipitate vanadium sulfate crystals in the positive electrode area during the charging and discharging process of the battery. Due to the existence of crystals, the flow field in the battery is blocked, thus greatly reducing the energy efficiency of the battery.
On the other hand, since the conductive diaphragm on the battery electrode is an activated proton exchange membrane, vanadium ions will permeate on the proton exchange membrane during the charge and discharge process of the vanadium battery, which further reduces the energy consumption of the vanadium battery. efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Put 100g of vanadium trioxide and 50g of vanadium pentoxide powder into a roasting furnace and roast at 400°C to 600°C to turn the yellow powder into black powder and obtain a multivalent vanadium compound, in which the tetravalent vanadium is greater than the total vanadium 50% of. Add concentrated sulfuric acid with a specific gravity of 1.84 into distilled water for 2:1 dilution, add the heat-treated compound into the diluted sulfuric acid to stir, mix and react, and prepare a vanadyl sulfate solution with a concentration of 70% to 75% according to the mass fraction , wherein the total vanadium concentration is 40%, then add 9% alkali metal salt additives in the vanadyl sulfate solution, such as one or more sulfates of potassium, lithium or sodium, to obtain the electrolytic solution for vanadium redox flow battery liquid. Putting the prepared electrolyte into the battery according to the requirements of the vanadium battery for charging and discharging experiments,...

Embodiment 2

[0012] Put 80g of vanadium trioxide and 50g of vanadium pentoxide powder into a roasting furnace and roast at a temperature of 300°C to 500°C to turn the yellow powder into a black powder and obtain a multivalent vanadium compound, in which the tetravalent vanadium is greater than the total 50% of barium. Add concentrated sulfuric acid with a specific gravity of 1.84 into distilled water for 2:1 dilution, add the heat-treated compound into the diluted sulfuric acid for stirring, mixing and reaction, and prepare vanadyl sulfate with a concentration of 65% to 70% according to the mass fraction solution, wherein the total vanadium concentration is 35%. Then add 8% alkali metal salt additives to the vanadyl sulfate solution, such as: one of the nitrates of potassium, lithium or sodium; one of the chloride salts of potassium, lithium or sodium; or add 4% each Potassium nitrate and sodium nitrate; 5% potassium chloride and 3% sodium nitrate can also be added respectively to obtain ...

Embodiment 3

[0014] Put 120g of vanadium trioxide and 60g of vanadium pentoxide powder into a roasting furnace and roast at a temperature of 600°C to 700°C to turn the yellow powder into a black powder and obtain a multivalent vanadium compound, in which the tetravalent vanadium is greater than the total 50% of vanadium. Add concentrated sulfuric acid with a specific gravity of 1.84 into distilled water for 2:1 dilution, add the heat-treated compound into diluted sulfuric acid for stirring, mixing and reaction, and prepare a vanadyl sulfate solution with a concentration of 60% to 65% according to the mass fraction , wherein the total vanadium concentration is 40%. Then add 5% alkali metal salt additive and 3% alkaline earth metal salt additive respectively in the vanadyl sulfate solution, such as one of potassium, lithium or sodium nitrate, and one or two of magnesium, calcium, strontium or barium nitrate to obtain an electrolyte solution for a vanadium redox flow battery. The prepared e...

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Abstract

The present invention relates to a preparation method for electrolyte of vanadum oxidation-reduction liquid stream. It contains 1, putting weight ratio 1.5-2.5 :1 vanadium trioxide and vanadium pentoxide powder in furnace and calcination at 200-700 degree centigrade, to make yellow powder became black powder to obtain multivalent vanadum compound, wherein quadravalence vanadum greater than total vanadum by 50 per cent, 2, adding distilled water in specific gravity 1.84 concentrated sulfuric acid to proceed 2 : 1 diluting then adding above-mentioned compound, according to mass fraction preparation to 65-75 per cent concentration vanadyl sulfate solution, wherein total vanadum concentration in 25-45 per cent, 3, adding 1-10 per cent concentration alkali salt or alkali salt and alkaline earth metal salt. Said invention adds additive in vanadyl sulfate solution, which not only raising vanadum ion solubility, preferably solving crystallizing jamming battery flow field problem in charge discharge process, but also reducing vanadium ion osmotic problem in film, greatly raising battery energy source efficiency.

Description

technical field [0001] The invention relates to a method for preparing an electrolyte for a storage battery, in particular to a method for preparing an electrolyte for a vanadium redox flow battery. Background technique [0002] Since Marria Kazacos of the University of New South Wales in Australia proposed the use of vanadyl sulfate as the active material of the battery in 1985, after more than ten years of research and development, the vanadium redox flow battery technology has approached maturity. In recent years, vanadium redox flow cell has received great attention. The main reason is that this battery system has adjustable battery capacity, no solid-phase reaction, and no change in the structure and form of electrode materials. It is an ideal power storage device in wind power generation and solar power generation systems due to its low price, high cycle life, high safety and high energy efficiency. The vanadium battery uses vanadyl sulfate solution as the electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/02H01M10/36H01M8/18H01M12/02
CPCY02E60/528Y02E60/128Y02E60/10Y02E60/50
Inventor 缪强
Owner 缪强
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