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A kind of preparation method of high energy 3.5 valent sulfur-salt mixed acid system vanadium electrolyte

An electrolyte and mixed acid technology, which is applied in the field of vanadium battery manufacturing, can solve the problems of low vanadium ion concentration and insufficient stability, and achieve the effects of high vanadium ion concentration, convenient operation and strong adaptability

Active Publication Date: 2022-04-01
江西银汇新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing a high-energy 3.5-valence sulfur-salt mixed acid system vanadium electrolyte to solve the technical problems of low vanadium ion concentration and insufficient stability in the electrolyte

Method used

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  • A kind of preparation method of high energy 3.5 valent sulfur-salt mixed acid system vanadium electrolyte
  • A kind of preparation method of high energy 3.5 valent sulfur-salt mixed acid system vanadium electrolyte
  • A kind of preparation method of high energy 3.5 valent sulfur-salt mixed acid system vanadium electrolyte

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 74.94g V 2 o 3 and 82.94g VO 2 Mix (the mixing ratio is 1:1.11, and the mixed valence is 3.5) into the reactor and add 120.00g of water (the ratio of vanadium mixture c to water: 1:0.76), start heating and stirring, and then add 50.00mL· min -1 (0.32mL·min -1 g -1 ) speed to add mass concentration is 98% sulfuric acid 220.00g (1.39 times of the quality of vanadium mixture c), the temperature of the solution is raised to 130°C, then add 130.00g of 36% hydrochloric acid (0.82 times of the quality of vanadium mixture c), keep the temperature After reacting at 118°C for 3.5h, add 150.00g of water (0.95 times the mass of vanadium mixture c) and 200.00g of 36% hydrochloric acid (1.26 times the mass of vanadium mixture c), stop heating, continue stirring and dissolving, when the temperature drops to 45 ℃ to stop the reaction, the unactivated electrolyte can be obtained; the vanadium ion concentration is 2.80mol / L, the chloride ion concentration is 4.00mol / L, the sul...

Embodiment 2

[0050] Weigh 158.00g V 4 o 7 (only add vanadium mixture d, the valence is 3.5) into the reactor and add 110.00g of water (the ratio of vanadium mixture d to water: 1:0.70), start heating and stirring, and then 60.00mL·min -1 (0.38mL·min -1 g -1 ) speed to add mass concentration is 98% sulfuric acid 379.05g (2.40 times of the quality of vanadium mixture c), the temperature of the solution is raised to 130°C, then add 150.00g of 36% hydrochloric acid (0.95 times of the quality of vanadium mixture c), keep the temperature After reacting at 118°C for 3.5h, add 550g of water (3.48 times the mass of vanadium mixture c) and 300.00g of 36% hydrochloric acid (1.90 times the mass of vanadium mixture c), stop heating, continue stirring and dissolving, when the temperature drops to 45°C Stop the reaction to obtain unactivated electrolyte; the vanadium ion concentration is 1.50mol / L, the chloride ion concentration is 3.24mol / L, the sulfate radical is 2.85mol / L, and the hydrogen ion conc...

Embodiment 3

[0054] Weigh 224.82g V 2 o 3 and 90.94g V 2 o 5 Mix (the mixing ratio is 1:0.405, the mixed valence is 3.5) into the reactor and add 110.00g of water (the ratio of vanadium mixture c to water: 1:0.35), start heating and stirring, and then 40mL·min -1 (0.13mL·min -1 g -1 ) speed adding mass concentration is 98% sulfuric acid 226.00g (0.72 times of vanadium mixture c quality), the temperature of solution is raised to 125 ℃, then adds 36% hydrochloric acid 135.00g (0.43 times of vanadium mixture c quality), keeps temperature After reacting at 115°C for 2.0h, add 150.00g (0.47 times the mass of vanadium mixture c) of water and 130.00g of 36% hydrochloric acid (0.44 times the mass of vanadium mixture c), stop heating, continue stirring and dissolving, when the temperature drops to 45 ℃ to stop the reaction, the unactivated electrolyte can be obtained; the vanadium ion concentration is 2.50mol / L, the chloride ion concentration is 3.64mol / L, the sulfate radical is 2.85mol / L, and...

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Abstract

The invention provides a method for preparing a high-energy 3.5-valent sulfur-salt mixed acid system vanadium electrolyte, comprising the steps of: mixing vanadium mixture a and vanadium mixture b according to a certain ratio, so that the comprehensive valence state of the mixed vanadium mixture is 3.50 The vanadium mixture c; the vanadium mixture c and water are added in the reaction tank in proportion, and the sulfuric acid with a mass fraction of 90% to 98% is added to control the feed rate to raise the temperature of the solution to 80°C to 135°C; the added mass fraction is 30% % to 37% hydrochloric acid, keep the temperature at 50°C to 125°C, add 30% to 37% hydrochloric acid to stop heating, and the temperature drops to 15°C to 45°C to obtain the electrolyte. The electrolytic solution obtained by the present invention not only has a high concentration of vanadium ions, but also can meet the requirement that the positive and negative electrode electrolytes have good stability in a wide temperature range. In addition, the preparation process adopted has strong adaptability of raw materials, simple process, The operation is convenient, the production energy consumption is low, and the quality of the produced electrolyte is controllable.

Description

technical field [0001] The invention relates to the field of vanadium battery manufacture, in particular to a method for preparing a high-energy 3.5-valent sulfur-salt mixed acid system vanadium electrolyte. Background technique [0002] All-vanadium redox flow battery (VRB) is known as "new clean energy battery". It is a type of new energy battery with relatively good application prospects, and it is also one of the excellent green batteries with strong development momentum. Compared with other batteries, it has the characteristics of adjustable energy storage capacity and power, high current non-destructive deep discharge, simple operation and maintenance, high reliability, long service life, low pollution, etc., and can be widely used in renewable energy storage (such as wind power , Photovoltaic), power grid peak shaving, backup power and other fields. After decades of development, the technology has become mature, and has been industrialized in China, Japan, the United...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/08H01M8/18
CPCH01M8/08H01M8/188H01M2300/0005H01M2300/0011Y02E60/50
Inventor 徐辉尹兴荣吴雪文彭礼吴雄伟向小绢刘俊孙小生唐红梨张洁胡永清
Owner 江西银汇新能源有限公司
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