All-vanadium ion redox flow battery electrolyte and preparation method thereof

A liquid flow battery and vanadium ion technology, applied in the direction of fuel cells, acidic electrolytes, aqueous electrolytes, etc., can solve the problem of high cost, achieve the effects of reducing raw material costs, improving electrolysis efficiency, and large energy consumption for electrolysis

Inactive Publication Date: 2018-11-13
四川星明能源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide an all-vanadium ion redox flow battery electrolyte and its preparation method, aiming to solve the problem of high cost in the existing electrolyte preparation method

Method used

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  • All-vanadium ion redox flow battery electrolyte and preparation method thereof
  • All-vanadium ion redox flow battery electrolyte and preparation method thereof

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preparation example Construction

[0028] Such as figure 1 As shown, the preparation method of the all-vanadium ion redox flow battery electrolyte provided by the embodiment of the present invention includes the following steps:

[0029] S101: Raw material containing vanadium with V 2 o 5 It is mixed with reducing agent at a molar ratio of 5-1:1-5, and then fully reacted in sulfuric acid solution; the vanadium-containing raw material is selected from at least one of ammonium polyvanadate and ammonium metavanadate; the reducing agent is selected from fatty acids and their At least one of derivatives, aromatic acids and their derivatives, aliphatic alcohols and their derivatives, aromatic alcohols and their derivatives;

[0030] S102: Electrolyzing the solution after the reaction to obtain an electrolyte solution for the all-vanadium ion redox flow battery.

[0031] The vanadium-containing raw material in step S101 is V 2 o 5 The molar ratio of the meter to the reducing agent is 2-1:1-4; the concentration of...

Embodiment 1

[0036] Example 1 Preparation of all-vanadium ion redox flow battery electrolyte by the method of the present invention

[0037] Take by weighing ammonium polyvanadate 112g (containing V 2 o 5 48%), poured into 150mL of 10mol / L sulfuric acid solution, bubbling and stirring to disperse the ammonium polyvanadate evenly, controlling the temperature at 90°C, and bubbling and stirring the gas flow rate to 500L / s; weighed 38g of oxalic acid, and added it in 8 times In the above reaction solution, after reacting for 0.5h, let it stand for 10min, move the solution into the negative half cell of the electrolytic cell, and add an equal volume of 3mol / L sulfuric acid solution to the positive half cell for electrolytic reaction. The positive half cell adopts DSA electrode, the negative half cell adopts porous graphite electrode, the positive and negative electrode area ratio is 1:1, and the quantity ratio is 1:5. 2 The average current density is electrolyzed, the temperature is controlle...

Embodiment 2

[0039] Example 2 Preparation of all-vanadium ion redox flow battery electrolyte by the method of the present invention

[0040] Take by weighing ammonium polyvanadate 150g (containing V 2 o 5 55%), poured into 150mL of 5mol / L sulfuric acid solution, bubbling and stirring to disperse the ammonium polyvanadate evenly, controlling the temperature at 80°C, and bubbling and stirring air flow of 1000L / s; Weighing 57g of propionic acid, divided into 10 times Add it into the above reaction solution, after reacting for 1 hour, let it stand for 20 minutes, move the solution into the negative half cell of the electrolytic cell, and add an equal volume of 2.5mol / L sulfuric acid solution to the positive half cell for electrolytic reaction. The positive half cell adopts DSA electrode, and the negative half cell adopts porous graphite electrode. 2 The average current density of electrolysis is carried out, the temperature is controlled at 60 ° C, bubbling and stirring, the electrolysis tim...

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Abstract

The invention discloses all-vanadium ion redox flow battery electrolyte and a preparation method thereof. The preparation method comprises the following steps: preparing a vanadium-containing raw material by mixing V2O5 and a reducing agent in a molar ratio of (5 to 1):(1 to 5), and then fully reacting in a sulfuric acid solution; electrolyzing the reacted solution to obtain the all-vanadium ion redox flow battery electrolyte. According to the invention, an intermediate product, namely ammonium polyvanadate or ammonium metavanadate, obtained by extracting vanadium from vanadium slag, is takenas a raw material, and the vanadium battery electrolyte is prepared by a chemical dissolution and electrolysis preparation two-step method, and compared with a conventional electrolyte preparation process with V2O5 as a raw material, the preparation method does not require a final V2O5 product, which significantly reduces the raw material cost.

Description

technical field [0001] The invention belongs to the technical field of vanadium battery electrolyte, and in particular relates to an all-vanadium ion redox flow battery electrolyte and a preparation method thereof. Background technique [0002] All-vanadium ion redox flow battery, referred to as vanadium battery, is a new type of green battery. As a flow battery, its energy is stored in the form of positive and negative electrolytes, and the positive and negative reactions are: [0003] Positive reaction: VO 2 + +2H + +e - →VO 2+ +H 2 O E 0 = 1.00V [0004] Negative reaction: V 2+ -e - →V 3+ E. 0 =-0.26V [0005] The positive and negative electrolytes are each driven by a pump, and reduction and oxidation reactions occur on the electrodes on both sides of the ion exchange membrane, respectively, to complete the charge and discharge cycle. Electrolyte is the key material for energy storage and release of vanadium batteries. Studies have shown that the cost of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2250/20H01M2300/0011Y02E60/50
Inventor 张忠裕刘在波刘磊张小平荆七一蒲年文谢建国
Owner 四川星明能源环保科技有限公司
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