Method for preparing vanadium electrolyte for all-vanadium redox flow battery

A technology for all-vanadium redox flow batteries and electrolytes, which is applied in the field of preparing vanadium electrolytes for all-vanadium redox flow batteries, which can solve the problems of increasing the transportation cost of vanadium electrolytes and relatively large restrictions on vanadium electrolytes, so as to reduce incomplete conversion , low cost, small volume effect

Pending Publication Date: 2022-04-15
BEIJING PRUDENT CENTURY TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor believes that although the vanadium electrolyte solution is obtained in the related technology, the prepared vanadium electrolyte solution contains a large amount of sulfuric acid and has strong fluidity, so the transportation of the vanadium electrolyte solution is relatively limited , and special containers are needed for transportation, which greatly increases the transportation cost of vanadium electrolyte, which is not conducive to the promotion of vanadium electrolyte

Method used

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  • Method for preparing vanadium electrolyte for all-vanadium redox flow battery
  • Method for preparing vanadium electrolyte for all-vanadium redox flow battery
  • Method for preparing vanadium electrolyte for all-vanadium redox flow battery

Examples

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Embodiment 1-5

[0036] Example 1 is taken as an example for description below.

Embodiment 1

[0038] In embodiment 1, vanadium electrolyte is prepared according to the following steps:

[0039] (1) Take 10g of high-purity vanadium pentoxide, put it into a crucible, put the crucible into a heating device, heat it at 600°C for 4h, and pass hydrogen into the crucible at a rate of 250mL / min while heating , obtain calcine after heating, and calcine is low-valent vanadium oxide; The composition of metal element in high-purity vanadium pentoxide is as shown in table 1;

[0040] (2) Take 4g of low-valent vanadium oxide, put it into a glass dish, add a total of 12g of concentrated sulfuric acid to the glass dish, put the glass dish into a heating device, heat it at 300 ° C for 2h, and generate a yellow-green solid after the reaction is completed material, the yellow-green solid material is the vanadium-containing paste electrolyte; in this step, the mass fraction of concentrated sulfuric acid is 98%;

[0041] (3) The vanadium-containing paste electrolyte is mixed with water at...

Embodiment 2

[0045] The difference between this example and Example 1 is that the heating temperature in step (1) is 650° C., the heating time is 2 h, and the rate of hydrogen gas feeding is 200 mL / min.

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Abstract

The invention relates to the technical field of battery materials, and particularly discloses a method for preparing a vanadium electrolyte for an all-vanadium redox flow battery. The method for preparing the vanadium electrolyte for the all-vanadium redox flow battery comprises the following steps: (1) heating high-purity vanadium pentoxide, and reducing the high-purity vanadium pentoxide by using a reducing gas to obtain a low-valence vanadium oxide; (2) mixing the low-valence vanadium oxide with an activating agent, and heating and activating to obtain a vanadium-containing pasty electrolyte; and (3) dissolving the vanadium-containing pasty electrolyte in water to obtain the vanadium electrolyte of which the average valence state of vanadium is between positive trivalence and positive tetravalence. Compared with a finished product vanadium electrolyte, the vanadium-containing paste electrolyte disclosed by the invention is small in size, and the sulfuric acid is cured, so that the corrosion of the sulfuric acid to a container can be reduced, and the cost of transporting the vanadium-containing paste electrolyte is lower than that of directly transporting the vanadium electrolyte, and therefore, the vanadium electrolyte is favorably popularized.

Description

technical field [0001] The present application relates to the technical field of battery materials, and more particularly, to a method for preparing a vanadium electrolyte for an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery is a new type of electrochemical energy storage system. Compared with traditional batteries, it has the characteristics of fast and large-capacity charging and discharging, low self-discharge rate and simple battery structure. Vanadium electrolyte is the core of vanadium battery energy storage and energy conversion, usually sulfuric acid with VO2+ / VO2+ and V2+ / V3+ redox potentials. In practical production and application, in order to facilitate the promotion of vanadium batteries, not only a high concentration of electrolyte is required to achieve high specific energy of vanadium batteries, but also high stability of the electrolyte is required. [0003] In the related art, most of them use high-purity va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18C01G31/02
CPCY02E60/50Y02P70/50H01M8/188H01M8/20H01M8/18H01M2300/0002
Inventor 黄绵延葛启明刘佳
Owner BEIJING PRUDENT CENTURY TECH CO LTD
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