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Production method and application of vanadium cell electrolyte crystal

A production method and electrolyte technology, applied in the direction of fuel cells, regenerative fuel cells, electrochemical generators, etc., to achieve the effects of saving freight, reducing transportation costs, and reducing transportation weight

Active Publication Date: 2015-09-23
大连融科储能集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If pure vanadium-containing crystals, concentrated sulfuric acid, and water are used separately as raw materials, and the electrolyte is prepared at the project site, it will inevitably involve the purchase, transportation and operation of concentrated sulfuric acid.

Method used

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  • Production method and application of vanadium cell electrolyte crystal
  • Production method and application of vanadium cell electrolyte crystal
  • Production method and application of vanadium cell electrolyte crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 300g vanadium sulfate (V 2 (SO 4 ) 3 10H 2 O), 265g vanadyl sulfate (VOSO 4 ·5H 2 (2), 260g concentrated sulfuric acid (98%), stir well and keep the temperature at 90°C, continue to stir for 10h, cool to room temperature and continue to stir for 5h, the material is initially liquid, and gradually solidifies into powder, and the powder is detected, and the main components are: V 11%, V 3+ 5.45%, V 3+ / VO 2+ =0.98, SO 4 2- 56.8%, the rest is water. Sampling is carried out XRD analysis, obtains XRD pattern such as figure 1 . from figure 1 It can be seen that the crystals have been acidified by concentrated sulfuric acid, and the original sulfate crystals have been transformed into trivalent and tetravalent vanadium-containing double salt crystals of sulfuric acid.

[0040] Take 500g of the above electrolytic liquid crystal, add 350ml of water, heat to 100°C, stir for 2h, and all the crystals are dissolved. The liquid was fixed to 650ml to obtain an electr...

Embodiment 2

[0045] Add 250g vanadium sulfate (VSO 4 ·7H 2 O), 750g vanadyl sulfate (VOSO 4 ·5H 2 (0), 660g concentrated sulfuric acid, stir evenly, and maintain 100 ℃, continue to stir for 5h, cool to room temperature and continue to stir for 10h, the material is gradually solidified into powder by liquid; detection powder, composition is: V 10.4%, V 3+ 6.15%, V 3+ / VO 2+ = 1.02, SO 4 2- 53%, the rest is water.

[0046] Take 800g of the above electrolytic liquid crystal, add 500ml of water, heat to 100°C, stir for 2 hours, and all the crystals are dissolved. The liquid was fixed to 800ml to obtain an electrolyte solution in which the average vanadium valence state was 3.47, the vanadium was 2 mol / l, and the sulfate radical was 5.2 mol / l.

[0047] The dissolved solution is divided into two parts, which are loaded into the positive and negative electrodes of the battery respectively, activated by the initial charge, and used for the battery charge and discharge cycle.

Embodiment 3

[0049] (1) Crystal production

[0050] negative crystal

[0051] Get 200g vanadium sulfate (V 2 (SO 4 ) 3 .10H 2 (0) add 75g 98% concentrated sulfuric acid, the mass ratio of vanadium sulfate and concentrated sulfuric acid is 2.67, stir evenly, maintain reaction temperature 60 ℃, continue to stir 8h, be cooled to room temperature and continue to stir 10h, material is solidified into green powder gradually by liquid state. Sampling and testing the powder, the main components are V 13.01%, V 3+ / V99.7%, SO 4 2- 63.47%, the rest is water.

[0052] Positive crystal

[0053] Get 178g vanadyl sulfate (VOSO 4 ·5H 2 (0) powder, add 105g 98% concentrated sulfuric acid, stir evenly, maintain reaction temperature 90 ℃ and continue to stir for 5h, be cooled to room temperature and continue to stir for 8h, material is solidified into green powder gradually by muddy state. Sampling and testing the powder, the main components are V 12.68%, VO 2+ / V 99.8%, SO 4 2- 61%, the rest ...

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Abstract

The invention discloses a production method and application of a vanadium cell electrolyte crystal. The production method comprises the following steps: a, adding vanadium sulfate in concentrated sulfuric acid, and stirring the mixture uniformly, wherein the mass ratio of the vanadium sulfate to the concentrated sulfuric acid is 0.5 to 4; b, stirring materials obtained in the step a for 1-24 h at the temperature of 20-150 DEG C; and c, cooling materials obtained in the step b to room temperature. Different from traditional vanadyl sulfate and vanadium sulfate crystals, the crystal obtained by the method contains additional sulfate radicals, wherein the proportion of total sulfate radicals to vanadium accords with the specification requirement of an electrolyte; as long as the crystal is dissolved in water, a vanadium electrolyte can be obtained once, and the preparation operation of the concentrated sulfuric acid on project site is not needed; and the scheme obviously reduces the transportation cost of a traditional liquid transportation method, and the flexibility of transportation is improved.

Description

technical field [0001] The invention relates to a production and application method of a vanadium battery electrolytic liquid crystal, belonging to the field of vanadium battery electrolyte. technical background [0002] In recent years, as an emerging energy storage battery, all-vanadium redox flow vanadium battery (VRFB) has great advantages in terms of safety and service life, and has been widely used in the energy storage process of wind power and solar power generation, and has become a The main means of valley adjustment. As a key energy storage medium, vanadium battery electrolyte is the main component of vanadium battery. [0003] The electrolyte contains a lot of sulfuric acid, which is a highly corrosive liquid, and high-quality IBC barrels must be used as storage and transportation containers. At present, the method of direct production and transportation of liquid electrolyte is widely used in the construction of battery projects all over the world. Due to saf...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50Y02P70/50
Inventor 宋明明陈彦博郝玥
Owner 大连融科储能集团股份有限公司
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