Preparation method of vanadium electrolyte

A technology of electrolyte and electrolyte solution, which is applied in the direction of circuits, fuel cells, electrical components, etc., can solve the problems of not using, the influence of vanadium batteries and electrolyte electrochemical performance and thermal stability, etc., and achieve the improvement of solubility and utilization rate Effect

Inactive Publication Date: 2014-01-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, many existing additives contain metals such as potassium and sodium, and some additives contain nitrogen. Although no change in the performance of the electrolyte can be seen in the short term, during the long-term operation of the battery, it will be found that additives containing these elements are harmful to vanadium. The electrochemical performance and thermal stability of the battery and electrolyte are seriously affected, so manufacturers of vanadium batteries generally do not use electrolytes containing additives

Method used

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  • Preparation method of vanadium electrolyte

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preparation example Construction

[0018] The preparation method of the vanadium electrolyte according to the present invention and the additives used in the method will be described in detail below.

[0019] According to an embodiment of the present invention, a method for preparing a vanadium electrolyte, the method includes the following steps: (i) dissolving vanadium pentoxide powder in concentrated sulfuric acid for activation, adding it to deionized water for dissolution and filtration, Obtain a pentavalent vanadium ion solution; (ii) use the pentavalent vanadium ion solution as the negative electrode electrolyte solution, and use the sulfuric acid solution as the positive electrode electrolyte solution, and perform electrolysis to obtain trivalent vanadium and tetravalent vanadium with a molar ratio of 1:1. Vanadium ion electrolyte solution, wherein, the sulfuric acid in the positive electrode electrolyte and the sulfuric acid in the negative electrode electrolyte solution have the same molar weight; (iii...

Embodiment 1

[0028] V 2 o 5 : High-grade pure (above 99.9%)

[0029] h 2 SO 4 : Analytical pure, d=1.84g / mL

[0030] h 3 PO 4 : Analytical pure, d=1.834×10 3 kg / m 3

[0031] (i) Weigh 320g of high-purity vanadium pentoxide, dissolve it in 160mL of concentrated sulfuric acid, and activate it for 10 minutes. Under stirring conditions, slowly add the activated vanadium in a muddy form to deionized water, add water to dissolve to 1L, Filtrate to obtain pentavalent vanadium solution.

[0032](ii) Measure 160mL of concentrated sulfuric acid, slowly add it into deionized water under stirring conditions, and dissolve to obtain 1L of sulfuric acid solution. The pentavalent vanadium solution obtained through the above step (i) is added to the negative electrode of the electrolytic cell as an electrolyte, and the prepared sulfuric acid solution is added to the positive electrode of the electrolytic cell as an electrolyte. The current of electrolysis is 20A, the electric quantity of electro...

Embodiment 2～4

[0037] Steps (i) and (ii) are the same as the above-mentioned Example 1, and the additives shown in Table 1 are respectively added in Step (iii) as Examples 2-4

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Abstract

The invention relates to a preparation method of a vanadium electrolyte, which comprises the following steps: dissolving vanadium pentoxide powder in a concentrated sulfuric acid for activation, adding into deionized water, dissolving and filtering to obtain a pentavalent vanadium ion solution; carrying out electrolysis by using the pentavalent vanadium ion solution as a negative electrode electrolyte solution and a sulfuric acid solution as a positive electrode electrolyte solution to obtain a vanadium ion electrolyte in which the mol ratio of trivalent vanadium to tetravalent vanadium is 1:1, wherein the molar weights of the sulfuric acid in the positive electrode electrolyte solution and the sulfuric acid in the negative electrode electrolyte solution are equal; and adding an additive into the vanadium ion electrolyte, and dissolving to obtain the vanadium electrolyte, wherein the additive comprises a phosphorous compound, and the mass percent of the compound in the vanadium electrolyte is 0.5-1.5%. The preparation method provided by the invention does not influence the service life of the vanadium battery and electrolyte on the premise of enhancing the concentration and stability of the electrolyte.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a method for preparing a vanadium electrolyte. Background technique [0002] Vanadium redox flow battery (referred to as vanadium battery) is a new type of storage battery. Because of its low cost, high energy conversion efficiency, and environmental friendliness, it has been developed rapidly and is gradually becoming practical. In the vanadium battery, a single metal vanadium ion solution is used as the electrolyte, which contains sulfuric acid (as a supporting electrolyte) and vanadium ions of different valence states (as the active material of the vanadium battery), so the storage performance of the vanadium battery is better than that of other batteries. more dependent on its electrolyte. In order to achieve a high energy density of the battery, the electrolyte is required to have a high concentration and at the same time, a high stability. [0003] Compared with traditional batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/528H01M8/188Y02E60/50
Inventor 毛凤娇孙朝晖李道玉彭穗杨林江陈文龙曹敏
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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