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Preparation method of ion vanadium redox battery electrolyte

A liquid flow battery and vanadium ion technology, applied in the direction of indirect fuel cells, etc., can solve the problems of high cost, reduced electrolyte cost, complicated operation, etc., and achieve the effect of low cost, good electrochemical performance, and simple and easy-to-operate preparation process

Inactive Publication Date: 2012-02-15
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above method is complex in operation and high in cost, and fails to significantly reduce the cost of the electrolyte on the premise of ensuring the performance of the electrolyte

Method used

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  • Preparation method of ion vanadium redox battery electrolyte
  • Preparation method of ion vanadium redox battery electrolyte
  • Preparation method of ion vanadium redox battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 0.3 mol of ethanol with 500 ml of deionized water to obtain an aqueous solution of an organic reducing agent, then weigh 0.75 mol of vanadium pentoxide and 4 mol of sulfuric acid and mix to obtain a suspension. Add the aqueous solution of the organic reducing agent to the mixed suspension of vanadium pentoxide and sulfuric acid aqueous solution, seal the outlet of the reaction vessel, heat and stir, and control the temperature at 60°C; after the reaction, open the outlet of the vessel and continue heating for 30 minutes. The temperature range is controlled at 120°C; after the solution is cooled to room temperature, deionized water is added to make the volume to 1L, and a 1.5mol / L vanadium battery electrolyte is obtained. Graphite is used as the positive and negative electrode material, and the concentration of the positive and negative electrode solutions is 1.5mol / L. The vanadium battery electrolyte has a charging current density of 20mA / cm 2 , the discharge c...

Embodiment 2

[0027] Dissolve 0.2 mol of acetaldehyde with 500 ml of deionized water to obtain an aqueous solution of an organic reducing agent, then weigh 0.75 mol of vanadium pentoxide and 4 mol of sulfuric acid and mix to obtain a suspension. Add the aqueous solution of the organic reducing agent to the mixed suspension of vanadium pentoxide and sulfuric acid aqueous solution, seal the outlet of the reaction vessel, heat and stir, and control the temperature at 50°C; after the reaction, open the outlet of the vessel and continue heating for 30 minutes. The temperature range is controlled at 120°C; after the solution is cooled to room temperature, deionized water is added to make the volume to 1L, and a 1.5mol / L vanadium battery electrolyte is obtained. Graphite is used as the positive and negative electrode material, and the concentration of the positive and negative electrode solutions is 1.5mol / L. The vanadium battery electrolyte has a charging current density of 45mA / cm 2 , the discha...

Embodiment 3

[0029] Dissolve 0.15 mol of acetaldehyde and 0.15 mol of isopropanol with 500 ml of deionized water to obtain an aqueous solution of an organic reducing agent, then weigh 0.75 mol of vanadium pentoxide and 4 mol of sulfuric acid and mix to obtain a suspension. Add the aqueous solution of the organic reducing agent to the mixed suspension of vanadium pentoxide and sulfuric acid aqueous solution, seal the outlet of the reaction vessel, heat and stir, and control the temperature at 60°C; after the reaction, open the outlet of the vessel and continue heating for 60 minutes. The temperature range is controlled at 150°C; after the solution is cooled to room temperature, deionized water is added to make the volume to 1L to obtain a 1.5mol / L vanadium battery electrolyte. Graphite is used as the positive and negative electrode material, and the concentration of the positive and negative electrode solutions is 1.5mol / L. The vanadium battery electrolyte has a charging current density of 6...

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Abstract

The invention discloses a preparation method of ion vanadium redox battery electrolyte. The method comprises the following steps: 1. mixing vanadium pentoxide powder and sulfuric acid solution, heating and stirring until the temperature is 50-250DEG C to obtain turbid liquid of the mixed the vanadium pentoxide powder and the sulfuric acid water solution; 2. preparing organic reductant water solution, wherein the organic reductant comprises any one of C1-4 water soluble alcohols and water soluble aldehydes; 3. adding the sulfuric acid water solution into the turbid liquid, sealing the outlet of a reaction container, heating, stirring, and controlling temperature to be between 50 and 250DEG C; after reaction ends, opening the outlet of the container, and continuously heating for 5-180 minutes; and after solution is cooled to room temperature, carrying out constant volume to obtain the vanadium redox battery electrolyte. The method has the advantages of low raw material cost, wide resource, simple and easily-operated technology, moderate and safe reaction condition and short reaction period and is suitable for large-batch production, and the vanadium redox battery electrolyte with low cost and high performance is prepared, and the vanadium redox battery electrolyte shows favorable electrochemistry performance in the charging and discharging experiment.

Description

technical field [0001] The invention relates to the fields of battery manufacturing and energy storage, in particular to a method for preparing an electrolyte solution of a low-cost all-vanadium ion redox flow battery. Background technique [0002] All-vanadium ion redox flow battery, referred to as vanadium battery, is a new type of green battery. Vanadium ion solutions in different valence states are used as the positive and negative electrolytes respectively, and the solutions are pressed from the storage tank into the battery stack through an external pump. After the electrochemical reaction is completed, the solution returns to the storage tank, and the liquid electrolyte continues to flow. Circular flow. Its battery reaction is: [0003] [0004] After the battery is charged, the positive electrode material is V (Ⅴ), and the negative electrode is V (II). When discharging, V(Ⅴ) gains electrons to become V(IV), and V(II) loses electrons to become V(Ⅲ). After discha...

Claims

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Application Information

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IPC IPC(8): H01M8/20
CPCY02E60/50
Inventor 蒋永伟
Owner SHANGHAI INST OF SPACE POWER SOURCES
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