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High-concentration vanadium electrolyte and preparation method thereof

An electrolyte and high-concentration technology, used in regenerative fuel cells and other directions, can solve problems such as restricting specific energy, and achieve the effects of high total vanadium concentration, good stability and electrochemical activity

Active Publication Date: 2016-04-20
周成壁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In sulfuric acid solution, the stability of V(II), V(III), and V(IV) increases with temperature rise, but V(V) will produce thermal precipitation effect at 40°C and above, so it is used for The preparation method of the electrolyte of the all-vanadium redox flow battery is limited by the solubility of vanadium in different valence states in the range of 10°C-40°C. The total vanadium concentration of the electrolyte is generally in the range of 2.0mol / L, which restricts the improvement of specific energy.

Method used

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  • High-concentration vanadium electrolyte and preparation method thereof

Examples

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Effect test

Embodiment

[0020] Explanation: In the examples described below, SA represents a kind of sulfonic acid, and the sulfonic acid used is methanesulfonic acid.

[0021] Example 1 VO(SA) 2 Preparation: Weigh an appropriate amount of sulfonic acid and V 2 o 5 . , put the sulfonic acid in a small beaker and add appropriate amount of distilled water, put V 2 o 5 into the solution, gradually adding oxalic acid until V 2 o 5 Completely dissolved, VO(SA) up to 4.5mol / L can be configured 2 solution.

[0022] With 100ml4.5mol / L VO(SA) 2 .

[0023] ① Weigh V 2 o 5 41.0g.

[0024] ② Take sulfonic acid and add a small amount of distilled water to a 250ml beaker.

[0025] ③The weighed V 2 o 5 Add all to ② beaker.

[0026] ④ Add oxalic acid and stir until V 2 o 5 Dissolve completely.

[0027] ⑤ Add distilled water to make up to 100ml. Serve.

Embodiment 2

[0028] Embodiment 2 Negative electrode liquid V (SA) 3 Preparation: Add appropriate amount of VO(SA) to the positive and negative chambers in the electrolytic cell 2 , electrolysis was carried out at an appropriate current density. After electrolysis for a suitable time, the negative electrode solution V(SA) is obtained in the negative electrode cavity 3 . V(SA) up to 4.0mol / L can be obtained 3 .

[0029] Prepare 3mol / LV(SA) 3 .

[0030] Electrolyte: 3mol / LVO(SA) 2 , 25ml;

[0031] Current: 300mA

[0032] Electrolysis time: 10h.

[0033] As in the above experiment, the negative electrode liquid is 3mol / LV(SA) in the negative electrode cavity 3

Embodiment 3

[0034] Embodiment 3 All-vanadium battery: the battery separates the positive and negative electrode chambers with a cation exchange membrane, the positive and negative electrode materials are carbon felt, and the positive electrode solution is 3mol / LVO (SA) 2 , the negative electrode solution is 3mol / LVO(SA) 2 . Charge and discharge current 200mA, time 1 hour. The highest charging voltage is 2.0V. The highest discharge voltage is 1.3V, and the discharge time above 1V can reach 32min., and the discharge time above 0.1V can reach 50min. in one cycle. Charge and discharge performance such as figure 1 shown.

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Abstract

The invention relates to a high-concentration vanadium electrolyte and a preparation method thereof. The high-concentration vanadium electrolyte comprises a positive electrolyte and a negative electrolyte of vanadium ions and sulfoacid ions. The positive electrolyte mainly contains tetravalent and quinquevalent vanadium ions [V(VI) and V(V)]; and the negative electrolyte mainly contains trivalent and divalent vanadium ions [V(III) and V(II)]. Sulfoacid can be methanesulfonic acid or another sulfoacid, and the general formula of the sulfoacid is shown as R-SO3H, wherein R represents alkyls or other groups. Another sulfoacid can be trifluoromethanesulfonic acid or sulfamic acid. In the preparation method, one or more vanadium oxides and a selectable reducing agent are dissolved in a sulfoacid solution to obtain precursors of the positive electrolyte and the negative electrolyte respectively; and the precursors of the positive electrolyte and the negative electrolyte are electrolyzed respectively to obtain a positive electrolyte and a negative electrolyte of oxidation reduction cells, wherein the positive electrolyte and the negative electrolyte can form various kinds of oxidation reduction cells as active materials.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a high-concentration vanadium electrolyte used for positive electrode electrolyte and negative electrode electrolyte of redox batteries and a preparation method thereof. Background technique [0002] Redox battery refers to a type of battery: the electroactive material of the battery exists in the form of ions or ion associations dissolved in the electrolyte during the charging and discharging process of the battery. A redox flow battery is a special type of redox battery. The positive and negative active materials of this type of battery are stored in two liquid storage tanks respectively. During operation, the positive and negative electrolytes flow through the positive half-cell and the negative half-cell, respectively, under the external force of the pump. The capacity of this type of battery is determined by the volume of the liquid storage tank,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 周德璧周成壁
Owner 周成壁
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