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Method of preparing electrolyte of vanadium ion redox flow battery

A flow battery, vanadium ion technology, applied in secondary batteries, regenerative fuel cells, indirect fuel cells, etc., can solve the problems of long production process, high production cost and high cost, and achieve widened application prospects, no harmful gas, The effect of short process flow

Inactive Publication Date: 2009-10-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The patent number is 200710122837.3 "A method for preparing high-purity electrolyte for vanadium batteries from stone coal", which proposes a method for preparing electrolyte for all-vanadium ion flow batteries using stone coal as raw material, but this method requires roasting, alkali leaching, and vanadium precipitation , and then through sulfuric acid dissolution and other processes, the production process is long, VO 2 .H 2 The vanadium precipitation process is difficult to control and the production cost is high
The patent number is 200610038914.2 "Preparation Method of Electrolyte for Redox Flow Battery". Black powder is obtained after roasting vanadium trioxide and vanadium pentoxide, and then dissolved in sulfuric acid solution to obtain vanadyl sulfate solution. The disadvantage of this method is that it uses Vanadium trioxide and vanadium pentoxide are used as raw materials, the cost is high and the roasting conditions are not easy to control

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] Take V 2 o 5 1000g of stone coal powder with a content of 0.50%, the leaching agents are sulfuric acid, hydrofluoric acid and sodium hypochlorite, and the dosages of the three are 200g, 30g and 1.0g respectively. Add leaching agent and deionized water to make 2.0L solution, mix with stone coal ore powder, leaching at 90°C for two hours, and obtain 1.8L of leaching solution after liquid-solid separation, of which V 2 o 5 The concentration is 2.3g / L, Fe 3+ Concentration is 5.1g / L, add 8.0g sodium thiosulfate, after stirring for 2min, Fe in the solution 3+ The concentration is less than 0.5g / L. Sodium hydroxide was used to adjust the pH value of the leaching solution to 2.5, and a stage of extraction was carried out. The amount of extractant: 90 mL of P204, 90 mL of TBP, diluted to 1.8 L with sulfonated kerosene, and the extraction time was 8 min; The 0.5mol / L sulfuric acid solution was subjected to one stage back extraction, the amount of stripping agent was 360mL, a...

Embodiment 2

[0025] Take V 2 o 5 1000g of stone coal powder with a content of 1.0%, the leaching agents are sulfuric acid, hydrofluoric acid and sodium hypochlorite, and the dosages of the three are 300g, 40g and 1.0g respectively. Add leaching agent and deionized water to make 2.0L solution, mix with stone coal ore powder, leaching at 90°C for two hours, and obtain 1.7L of leaching solution after liquid-solid separation, of which V 2 o 5 The concentration is 5.2g / L, Fe 3+ The concentration is 5.0g / L, add 10g of sodium thiosulfate, stir for 2min, Fe in the solution 3+The concentration is less than 0.5g / L. Use sodium hydroxide to adjust the pH value of the leaching solution to 2.5, and perform a stage of extraction. The amount of extractant: P204 is 90mL, TBP is 90mL, diluted to 1.7L with sulfonated kerosene, and the extraction time is 8min; after the loaded organic phase is washed, use The 0.5mol / L sulfuric acid solution was subjected to one stage back extraction, the amount of stripp...

Embodiment 3

[0027] Take V 2 o 5 1000g of stone coal powder with a content of 1.2%, the leaching agents are sulfuric acid, hydrofluoric acid and sodium hypochlorite, and the dosages of the three are 350g, 60g and 6.0g respectively. Add leaching agent and deionized water to make 2.0L solution, mix with stone coal ore powder, leaching at 90°C for two hours, and obtain 1.7L of leaching solution after liquid-solid separation, of which V 2 o 5 Concentration is 5.8g / L, Fe 3+ Concentration is 5.6g / L, add 12g sodium thiosulfate, after stirring for 2min, Fe in the solution 3+ The concentration is less than 0.5g / L. Sodium hydroxide was used to adjust the pH value of the leaching solution to 2.4, and a stage of extraction was carried out. The amount of extractant: 90mL of P204, 90mL of TBP, diluted to 1.7L with sulfonated kerosene, and the extraction time was 8min; The 0.5mol / L sulfuric acid solution was subjected to one-stage back extraction, the amount of stripping agent used was 170mL, and th...

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Abstract

The present invention relates to a method of preparing electrolyte of vanadium ion redox flow battery, the method use abundant stone coal in our country as raw material, direct acid dipping, liquid solid separation to obtain extract of tetravalent vanadium, after P204-TBP system extraction and sulfuric acid reextraction of the extract, obtaining a high pure vanadic sulfate solution with a concentration 1-5 mol / L. The invention provide method for preparing high pure vanadic sulfate solution is simple, comparing with other methods, there is no need to transfer the vanadium in the stone coal extract into deposition of poly-ammonium vanadate or ammonium metavanadate, then proceeding other complex process such as calcination, sulfuric acid dissolution etc. The method shorts preparation process of the electrolyte of vanadium ion redox flow battery, the extractant can be used circularly which reduces production cost greatly. The invention provides a novel process for preparing electrolyte of vanadium ion redox flow battery in short process and at low cost.

Description

technical field [0001] The invention belongs to the field of battery manufacturing, and in particular relates to a method for preparing an electrolyte for an all-vanadium ion flow battery. Background technique [0002] All-vanadium ion flow battery is an emerging energy source with high-efficiency energy storage, green environmental protection, and repeated rechargeable discharge. As the active material of vanadium ion flow battery, vanadium electrolyte is one of the most important components. The concentration of vanadium in the electrolyte and the amount of electrolyte determine the capacity of the battery. The quality of vanadium electrolyte has a direct impact on battery performance. . [0003] At present, the preparation method of the electrolyte of the all-vanadium ion flow battery mainly consists of the following: 1. 2 o 5 Mix with a certain amount of concentrated sulfuric acid to obtain clear VOSO after dissolution 4 acidic solution, and then assemble the solutio...

Claims

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Application Information

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IPC IPC(8): H01M8/18H01M8/20H01M10/38
CPCY02E60/12Y02E60/528Y02E60/50Y02E60/10Y02P70/50
Inventor 魏昶樊刚李兴彬李存兄李旻廷邓志敢
Owner KUNMING UNIV OF SCI & TECH
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