Method for directly preparing electrolyte for vanadium cell by using vanadium pentoxide

A vanadium pentoxide and vanadium battery technology, applied in electrolytes, fuel cells, regenerative fuel cells, etc., can solve problems such as environmental pollution, and achieve the effect of high dispersion and high concentration

Active Publication Date: 2015-04-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the present invention can produce high-concentration electrolyte, it needs to introduce phosphorus-containing additives, which pollutes the environment; and when it is used in batteries, the current efficiency is 90-97%

Method used

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  • Method for directly preparing electrolyte for vanadium cell by using vanadium pentoxide
  • Method for directly preparing electrolyte for vanadium cell by using vanadium pentoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] V 2 o 5 : Standard high-purity grade (concentration greater than 99.99%) self-made by Panzhihua Iron and Steel (15 impurity elements are all below a certain standard range)

[0038] h 2 SO 4 : Analytical pure, mass concentration ≥ 98%, d = 1.84g / mL

[0039] Weigh 265.8g of high-purity vanadium pentoxide, pour it into the reactor, add 250mL of water into the reactor, add 200mL of concentrated sulfuric acid into the reactor under stirring, and set the solution to 500mL; as catholyte.

[0040] Measure 330mL of water, slowly add 170mL of concentrated sulfuric acid under the condition of stirring, as anolyte.

[0041] The electrolysis process uses an electrolytic cell for electrolysis, and the cathode uses a graphite plate as the electrode plate, and its specific surface area is 80×130×5mm 2 ; The anode uses platinum sheet as the electrode plate, and its specific surface area is 20×30×0.1mm 2 . Using constant current electrolysis, the rated current of electrolysis is ...

Embodiment 2-3

[0048] Examples 2-4 are the same as Example 1 except that the proportions of the materials and ultrasonic treatment conditions are different from those of Example 1. The specific proportions and conditions are shown in Table 1. The properties obtained are shown in Table 2.

Embodiment 4

[0050] Embodiment 4 is only that ultrasonic treatment is not used in the electrolysis process, and the others are the same as Embodiment 1, and the obtained properties are shown in Table 2. A large number of experiments have shown that the higher the concentration, the worse the effect of the electrolyte obtained without ultrasound, and the electrochemical performance of the vanadium battery without ultrasound above 2.0M does not meet the basic requirements.

[0051] Table 1 Ratio of materials and conditions of ultrasonic treatment

[0052]

[0053] Table 2 Electrolyte concentration and battery performance

[0054] Example

[0055] 1

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PUM

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Abstract

The invention relates to the preparation field of electrolytes, and in particular relates to a method for directly preparing an electrolyte for a vanadium cell by using vanadium pentoxide. The invention provides a method for directly preparing the electrolyte for the vanadium cell by using vanadium pentoxide, the method comprises the following steps: a. preparing a vanadium pentoxide solution by using a wet method, namely firstly adding water in the vanadium pentoxide, adding sulfuric acid under stirring to dissolve vanadium pentoxide to form a vanadium pentoxide-sulfuric acid solution, wherein the proportion of vanadium pentoxide to water is (0.886-2)g / ml to 1g / ml, the mass concentration of sulfuric acid in the obtained solution is 0.736g / ml-0.92g / ml; b. electrolyzing, namely by using the vanadium pentoxide-sulfuric acid solution obtained in the step a as a catholyte solution, and using sulfuric acid with volume concentration of 0.613g / ml-0.736g / ml as an anodolyte solution, electrolyzing. The method provided by the invention is free from additives, the concentration of the electrolyte is 2.5-5mol / L, and the cell current efficiency is greater than 90%.

Description

technical field [0001] The invention relates to the field of preparation of electrolytes, in particular to a method for directly preparing electrolytes for vanadium batteries by vanadium pentoxide. Background technique [0002] All-vanadium redox flow battery (referred to as vanadium battery) is a new type of storage battery. Compared with traditional batteries, the energy storage capacity and total energy storage capacity of vanadium batteries are determined by the concentration of each vanadium ion in the electrolyte and the volume of the electrolyte. Therefore, the electrolyte is a crucial part of vanadium batteries, not only as a conductor ion but also as an energy storage medium. Vanadium batteries use sulfuric acid solutions of vanadium ions in different valence states as the electrolyte solution (ie active material), although the high specific energy of the battery is based on the oxidation-reduction reaction ions in the electrolyte solution, and redox reactions occu...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/002Y02E60/50
Inventor 毛凤娇李道玉程兴德蒋仁贵彭穗杨林江陈文龙曹敏
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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