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Method for preparing electrolytes of all-vanadium flow battery

An all-vanadium redox flow battery and electrolyte technology, which is applied in the field of liquid flow battery preparation, can solve problems such as unfavorable evaporation and crystallization, unstable sulfurous acid, and difficult removal of impurities, so as to reduce energy consumption, reduce production time, and save equipment input effect

Active Publication Date: 2015-04-29
HUNAN YINFENG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above synthetic route, V 2 o 5 The solubility in sulfuric acid solution is very small, and it needs to be heated for a period of time to dissolve (but the solubility is still relatively small). At the same time, due to the use of excess sulfuric acid to dissolve V 2 o 5 , resulting in more free acid remaining in the product, H in the solution + Concentration up to 2M, not conducive to evaporation and crystallization
Moreover, due to the use of a reducing agent, the impurities introduced by the reducing agent are not easy to remove, such as: using oxalic acid as the reducing agent, the excess oxalic acid is not easy to remove, using sulfurous acid as the reducing agent, the sulfurous acid is unstable, and it is easy to overflow a large amount of SO in the reaction process 2 polluted environment

Method used

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  • Method for preparing electrolytes of all-vanadium flow battery

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Effect test

Embodiment 1

[0015] Take purity 99% H 2 2g, 99.8% pure V 2 o 5 18.2g, high temperature (80 ℃) sintering, the resulting solid (V 2 o 4 Powder, V 2 o 3 Powder) is dissolved in 9.8 g of concentrated sulfuric acid of 18.4 mol / liter to obtain an electrolyte solution that can be used in an all-vanadium redox flow battery. Put the prepared electrolyte into the electrolytic cell for charging and discharging experiments: the charging platform is 1.7V, the discharging platform is 1.4V, and in the assembled stack, the current density is 50mA / cm 2 , the obtained current efficiency is 93.8%, the voltage efficiency is 88.3%, and the energy efficiency is 82.%.

Embodiment 2

[0017] Take purity 99% H 2 4g, 99.8% pure V 2 o 5 18.2g, high temperature (210 ℃) sintering, the resulting solid (V 2 o 4 Powder, V 2 o 3 Powder) was dissolved with 9.8 g of concentrated sulfuric acid at 10.0 mol / liter to obtain an electrolyte that can be used for all-vanadium redox flow batteries. Put the prepared electrolyte into the electrolytic cell for charging and discharging experiments: the charging platform is 1.7V, the discharging platform is 1.4V, and in the assembled stack, the current density is 60mA / cm 2 , the obtained current efficiency is 93.9%, the voltage efficiency is 86.1%, and the energy efficiency is 80.8%.

Embodiment 3

[0019] Take purity 99% H 2 3g, 99.8% pure V 2 o 5 18.2g, high temperature (500 ℃) sintering, the resulting solid (V 2 o 4 Powder, V 2 o 3Powder) was dissolved in 9.8 g of 6 mol / L concentrated sulfuric acid to obtain a vanadium battery electrolyte of 1:1 ratio between trivalent vanadium and tetravalent vanadium. Put the prepared electrolyte into the electrolytic cell for charging and discharging experiments: the charging platform is 1.7V, the discharging platform is 1.4V, and in the assembled stack, the current density is 70mA / cm 2 , the obtained current efficiency is 94.9%, the voltage efficiency is 83.3%, and the energy efficiency is 79.1%.

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Abstract

The invention relates to preparation of electrolytes of flow batteries and particularly relates to a method for preparing electrolytes of an all-vanadium flow battery. The method comprises the steps of (a) reducing V2O5 powder into V2O4 powder and V2O3 powder in a hydrogen gas atmosphere; and (b) dissolving the reduced V2O4 powder into concentrated sulfuric acid so as to obtain a vanadyl-sulfate tetravalent vanadium solution which serves as an anode electrolyte of the vanadium battery, dissolving the reduced V2O3 powder into concentrated sulfuric acid so as to obtain a sulfate trivalent vanadium solution which serves as a cathode electrolyte of the vanadium battery, or enabling the reduced V2O4 and V2O3 powder to be subjected to evaporative crystallization in sulfuric acid with the concentration of 6-18.4 mol / l so as to obtain VOSO4 and V2(SO4)3 crystals, and dissolving the VOSO4 and V2(SO4)3 crystals into dilute sulfuric acid, thereby obtaining vanadium electrolytes of the all-vanadium flow battery. The method disclosed by the invention has the advantages that the steps of heating dissolution, cooling dilution and the like are omitted, the reaction conditions are mild, the process is simple, the cost is low, and the product quality is stable.

Description

technical field [0001] The invention relates to the preparation of a liquid flow battery, in particular to a method for preparing an electrolyte for an all-vanadium redox flow battery. Background technique [0002] The vanadium battery research results published by the School of Chemical Engineering and Industrial Chemistry of the University of New South Wales (UNSW) in Australia since 1985 show that vanadyl sulfate is mainly used as the active material of the battery. Vanadium batteries are considered to be more competitive chemical power sources than lead batteries, and have huge market potential. The technical route of existing synthetic vanadyl sulfate is: with V 2 o 5 Put it into sulfuric acid and heat to dissolve, dilute with dilute sulfuric acid after natural cooling, add reducing agent (oxalic acid, sulfurous acid, etc.) In dilute sulfuric acid, an electrolyte that can be used in vanadium batteries is obtained. In the above synthetic route, V 2 o 5 The solubili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 吴雄伟彭礼萧荣滔吕善光
Owner HUNAN YINFENG NEW ENERGY
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