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Electrolyte of all-vanadium redox flow battery, and preparation method and application of electrolyte

A technology of all-vanadium redox flow battery and electrolyte, which is applied in the field of liquid flow battery electrolyte, all-vanadium redox flow battery electrolyte and its preparation. The effect of simplicity, shortened reaction time, and low equipment requirements

Inactive Publication Date: 2021-11-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned preparation method has complex process, high preparation cost and high reaction impurities
[0005] In summary, the existing electrolyte preparation methods have disadvantages such as complex process, high production cost, environmental pollution and low purity. Therefore, it is necessary to seek an electrolyte with simple process, low production cost, environmental friendliness and no impurities The preparation process is necessary

Method used

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  • Electrolyte of all-vanadium redox flow battery, and preparation method and application of electrolyte
  • Electrolyte of all-vanadium redox flow battery, and preparation method and application of electrolyte
  • Electrolyte of all-vanadium redox flow battery, and preparation method and application of electrolyte

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Experimental program
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Effect test

Embodiment 1

[0060] This embodiment provides a method for preparing an electrolyte solution for an all-vanadium redox flow battery, the preparation method comprising the following steps:

[0061] (1) Mix vanadium pentoxide and concentrated sulfuric acid at a molar ratio of 1:2.25, the concentration of concentrated sulfuric acid is 18.4mol / L, the stirring temperature is 25°C, and the stirring time is 0.5h to obtain a mixture;

[0062] (2) Activate the mixture described in step (1), the activation temperature is 150°C, the activation time is 2h, and the activated product (VO 2 ) 2 SO 4 , cooled to room temperature;

[0063] (3) The activator (VO) described in step (2) 2 ) 2 SO 4 Stir and dissolve, the dissolution temperature is 40°C, the solvent is dilute sulfuric acid of 3mol / L, dilute sulfuric acid and activator (VO 2 ) 2 SO 4 The liquid-solid ratio was 6mL / g, and the dissolution and stirring time was 1h to obtain a solution;

[0064] (4) Add Pd / C catalyst (SZ111-PDC, Beijing Zhon...

Embodiment 2

[0066] This embodiment provides a method for preparing an electrolyte solution for an all-vanadium redox flow battery, the preparation method comprising the following steps:

[0067] (1) Mix vanadium pentoxide and concentrated sulfuric acid at a molar ratio of 1:2, the concentration of concentrated sulfuric acid is 12mol / L, the stirring temperature is 15°C, and the stirring time is 2.5h to obtain a mixture;

[0068] (2) Activate the mixture described in step (1), the activation temperature is 100°C, the activation time is 2.5h, and the activated product (VO 2 ) 2 SO 4 , cooled to room temperature;

[0069] (3) The activator (VO) described in step (2) 2 ) 2 SO 4 Stir and dissolve, the dissolution temperature is 35°C, the solvent is dilute sulfuric acid of 2.5mol / L, dilute sulfuric acid and activator (VO 2 ) 2 SO 4 The liquid-solid ratio is 8mL / g, and the dissolution and stirring time is 2h to obtain a solution;

[0070] (4) Add a Pt / C catalyst (P816263-5g, 10%, McLean)...

Embodiment 3

[0072] This embodiment provides a method for preparing an electrolyte solution for an all-vanadium redox flow battery, the preparation method comprising the following steps:

[0073] (1) Mix vanadium pentoxide and concentrated sulfuric acid at a molar ratio of 1:3, the concentration of concentrated sulfuric acid is 18.4mol / L, the stirring temperature is 20°C, and the stirring time is 1.5h to obtain a mixture;

[0074] (2) Activate the mixture described in step (1), the activation temperature is 200°C, the activation time is 1.5h, and the activated product (VO 2 ) 2 SO 4 , cooled to room temperature;

[0075] (3) The activator (VO) described in step (2) 2 ) 2 SO 4 Carry out stirring and dissolving, dissolving temperature is 60 ℃, solvent is the dilute sulfuric acid of 4mol / L, dilute sulfuric acid and activator (VO 2 ) 2 SO 4 The liquid-solid ratio is 10mL / g, and the dissolving and stirring time is 1h to obtain a solution;

[0076] (4) Add Rh / C catalyst (206164, Sigma-A...

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Abstract

The invention relates to an electrolyte of an all-vanadium redox flow battery, and a preparation method and application of the electrolyte. The preparation method comprises the following steps: (1) mixing vanadium oxide with sulfuric acid to obtain a mixture; (2) activating the mixture obtained in the step (1) to obtain an activator; (3) dissolving the activator obtained in the step (2) to obtain a solution containing pentavalent vanadium; and (4) introducing hydrogen into the pentavalent vanadium-containing solution obtained in the step (3), adding a catalyst, and carrying out a reduction reaction to obtain the electrolyte of the all-vanadium redox flow battery. According to the method, pentavalent vanadium oxide is reduced by adopting a hydrothermal reduction method to prepare the low-valence vanadium electrolyte, and through heating activation and regulation and control of reducing gas and reaction conditions, the solubility of pentavalent vanadium is increased, a preparation process is simplified and production cost is reduced. The method has the advantages of simple process, cheap raw materials, mild conditions, environmental friendliness, avoidance of impurity introduction, low equipment requirements and the like, and is suitable for preparing the electrolyte of the all-vanadium redox flow battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and relates to an electrolyte for a flow battery, in particular to an electrolyte for an all-vanadium redox flow battery as well as a preparation method and application thereof. Background technique [0002] Environmental concerns are driving the development and use of higher quality and greater quantities of renewable energy. However, due to the unstable nature of renewable energy, electrochemical energy storage (EES) is urgently needed for practical utilization in grid applications. Redox flow batteries have the advantages of large energy capacity, high safety, and flexible control of energy-to-power ratio, and are very promising systems for EES applications. Notably, all-vanadium redox flow batteries (VRFBs) have attracted much attention due to their high efficiency and long lifetime without worrying about cross-contamination. However, despite these advantages, the commercialization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0002Y02E60/50
Inventor 胡超刘宏辉董玉明张伟徐红彬
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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