Method for preparing positive electrode electrolyte of vanadium battery

A cathode electrolyte and electrolyte technology, applied in the direction of regenerative fuel cells, etc., can solve the problems of difficult removal of impurities, unfavorable evaporation and crystallization, and difficult removal of oxalic acid, and achieve the effects of saving equipment investment, stable product quality, and reducing energy consumption.

Inactive Publication Date: 2013-03-13
HUNAN YINFENG NEW ENERGY
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AI Technical Summary

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 V2O5, more free acid remains in the product, and H in the solution + The concentration reaches 2 mol / L, which is not conducive to evaporative crystallization; and, due to the use of reducing agent, the introduced impurities are not easy to remove, such as: using oxalic acid as reducing agent, excessive oxalic acid is not easy to remove, using sulfurous acid as reducing agent, sulfurous acid is unstable , it is easy to overflow a large amount of SO during the reaction process 2 polluted environment

Method used

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  • Method for preparing positive electrode electrolyte of vanadium battery
  • Method for preparing positive electrode electrolyte of vanadium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take 1.2 g of C with a purity of 99%, V with a purity of 98% 2 o 5 18.2 g, 40 g of concentrated sulfuric acid with a specific gravity of 1.84g / mL, dilute the sulfuric acid with distilled water at a ratio of 1:1, add V 2 o 5 Then gradually add C while stirring, filter after cooling, evaporate the solution, add 2 mol / L sulfuric acid solution, and obtain a positive vanadium electrolyte that can be used for vanadium batteries. Put the prepared electrolyte into the electrolytic cell for charging and discharging experiments: the charging platform is 1.7 V, and the discharging platform is 1.4 V.

Embodiment 2

[0027] Take 24 g of C with a purity of 99%, V with a purity of 98% 2 o 5 364 g, 800 g of concentrated sulfuric acid with a specific gravity of 1.84g / mL, dilute the sulfuric acid with distilled water at a ratio of 1:1, add V 2 o 5 Then gradually add C while stirring, filter after cooling, evaporate the solution, add 2 mol / L sulfuric acid solution, and obtain a positive vanadium electrolyte that can be used for vanadium batteries. Put the prepared electrolyte into the electrolytic cell for charging and discharging experiments: the charging platform is 1.7 V, and the discharging platform is 1.4 V.

Embodiment 3

[0029] Take 240 g of C with a purity of 99%, V with a purity of 98% 2 o 5 3700 g, 8000 g of concentrated sulfuric acid with a specific gravity of 1.84g / mL, dilute the sulfuric acid with distilled water at a ratio of 1:1, add V 2 o 5 Then gradually add C while stirring, filter after cooling, evaporate the solution, add 2 mol / L sulfuric acid solution, and obtain a positive vanadium electrolyte that can be used for vanadium batteries. Put the prepared electrolyte into the electrolytic cell for charging and discharging experiments: the charging platform is 1.7 V, and the discharging platform is 1.4 V.

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Abstract

The invention discloses a method for preparing positive electrode electrolyte of a vanadium battery and relates to a battery pack. The method mainly comprises the following steps of: (a) adding V2O5 and a reducing agent (carbon) in a sulfuric acid solution being 1:1 to prepare a paste material; (b) sintering the prepared paste material at high temperature of 80-600 DEG C, so as to obtain a solid substance; (c) carrying out filtration and evaporation to prepare a vanadyl sulfate crystal; and (d) adding a 2mol/L sulfuric acid solution, so as to obtain the positive electrode vanadium electrolyte for an all-vanadium redox flow battery. According to the method, the carbon is taken as the reducing agent and the cost of the reducing agent is greatly lowered than that of other organic reducing agents, and therefore, the preparation cost of the electrolyte of the vanadium battery is lowered, the waste of raw materials is avoided and the method is beneficial to be used for large-scale production.

Description

technical field [0001] The invention relates to a battery pack, in particular to a method for preparing a positive electrode electrolyte of an all-vanadium redox flow battery. Background technique [0002] The School of Chemical Engineering and Industrial Chemistry of the University of New South Wales (UNSW) in Australia has published research results on vanadium batteries since 1985, mainly using vanadyl sulfate as the active material of the battery. Vanadium batteries are considered to be more competitive than lead batteries Powerful chemical power sources have huge market potential. The technical route of existing synthetic vanadyl sulfate is: V 2 o 5 → heating and dissolving sulfuric acid → cooling and diluting → reducing with reducing agent (oxalic acid, sulfurous acid, etc.) → evaporative crystallization → dehydration → VOSO 4 → Dissolve in 2 M sulfuric acid solution. In the above synthetic route, V 2 o 5 The solubility in sulfuric acid solution is very small, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/528Y02E60/50
Inventor 吴雄伟邓敏向小绢吕善光萧荣滔
Owner HUNAN YINFENG NEW ENERGY
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