Preparation method of high-energy 3.5-valent pure hydrochloric acid system vanadium electrolyte

An electrolyte and hydrochloric acid technology, applied in circuits, fuel cells, electrical components, etc., can solve the problems of insufficient stability and low vanadium ion concentration, and achieve a solution that reduces storage space and transportation costs, has high vanadium ion concentration, and is easy to operate. Effect

Inactive Publication Date: 2018-05-11
HUNAN YINFENG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing a high-energy 3.5-valent pure hydrochloric acid system vanadium electrolyte, so as to solve the technical problems of low vanadium ion concentration and insufficient stability in the electrolyte

Method used

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  • Preparation method of high-energy 3.5-valent pure hydrochloric acid system vanadium electrolyte
  • Preparation method of high-energy 3.5-valent pure hydrochloric acid system vanadium electrolyte
  • Preparation method of high-energy 3.5-valent pure hydrochloric acid system vanadium electrolyte

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Experimental program
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Effect test

Embodiment 1

[0040] Weigh 74.94g V 2 O 3 And 82.94g VO 2 Mix (mixing ratio is 1: 1.106, mixed valence is 3.5 valence) into the reactor and add 50.00g of water (the ratio of vanadium mixture c to water: 1:0.76), start heating and stirring, then add 36% Hydrochloric acid 625.00g (3.96 times the mass of the vanadium mixture c), raise the temperature of the solution to 118℃, keep the temperature for 3.5h, stop heating, add 100.00g of water (0.63 times the mass of the vanadium mixture c), continue to stir and dissolve When the temperature drops to 45℃ and the reaction is stopped, the unactivated electrolyte can be obtained; vanadium ion concentration is 2.80mol / L, chloride ion concentration is 8.50mol / L, hydrogen ion concentration is 1.50mol / L; The charge and discharge test after activation shows that the current efficiency is 97.60%, the voltage efficiency is 87.00%, the energy efficiency is 84.91%, and the energy density is 39.68Wh / L. The stability of the positive and negative electrode electr...

Embodiment 2

[0044] Weigh 158.00g V 4 O 7 (Add only vanadium mixture d) Add 60.00g of water to the reactor (the ratio of vanadium mixture c to water: 1:0.38), start heating and stirring, and then add 36% hydrochloric acid 770.00g (4.87 of the mass of vanadium mixture) The temperature of the solution was raised to 90°C, the temperature was kept for 6.0 hours, the heating was stopped, 483.00g of water (3.06 times the mass of the vanadium mixture c) was added, the stirring was continued, and the reaction was stopped when the temperature dropped to 30°C. The unactivated electrolyte can be obtained; the vanadium ion concentration is 1.50 mol / L, the chloride ion concentration is 8.24 mol / L, and the hydrogen ion concentration is 2.74 mol / L; the electrolyte is activated and charged and discharged, and the current efficiency is 96.40 %, the voltage efficiency is 87.10%, the energy efficiency is 83.96%, and the energy density is 33.74Wh / L. The stability of the positive and negative electrolytes after...

Embodiment 3

[0049] Weigh 5.36g VO and 515.20g 3.54-valence and 29.7% vanadium-containing chlorine-containing mixture and mix (mixing ratio is 1:96.12, mixed valence is 3.5 valence) into the reactor and add 50.00g water (vanadium mixture c and water The ratio is: 1:0.096), start heating and stirring, then add 302.1g of 36% hydrochloric acid (0.58 times the mass of the vanadium mixture c) to raise the temperature of the solution to 80°C, keep the temperature for 2h, stop heating, make up Add 403.00g of water (0.77 times the mass of vanadium mixture c) and continue to stir and dissolve. When the temperature drops to 30℃ and stop the reaction, the unactivated electrolyte can be obtained; the vanadium ion concentration is 2.60mol / L, and the chloride ion concentration is 8.64 mol / L, hydrogen ion concentration is 2.14mol / L; the electrolyte is activated and charged and discharged. The current efficiency is 95.73%, the voltage efficiency is 87.12%, the energy efficiency is 83.35%, and the energy den...

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Abstract

The invention provides a preparation method of a high-energy 3.5-valent pure hydrochloric acid system vanadium electrolyte. The preparation method comprises the following steps of performing mixing ona vanadium mixture a and a vanadium mixture b based on a certain proportion to enable the mixed vanadium mixture to become a vanadium mixture c with the comprehensive valence state of 3.50; adding the vanadium mixture c and water into a reaction tank based on a certain proportion, and then adding 30-37mass% of hydrochloric acid, and performing heating to enable the temperature of the solution tobe heated to 40-125 DEG C, maintaining the reaction for 0.5-10h and then stopping heating, wherein when the temperature is declined to 15-45 DEG C, the prepared electrolyte is obtained. The electrolyte obtained in the invention is high in vanadium ion concentration, and the positive electrode and negative electrode electrolyte can achieve relatively high stability in a relatively wide temperaturerange; and in addition, the adopted preparation process is high raw material adaptability, simple in flow, convenient to operate, and low in production energy consumption, and the produced electrolytehas controllable quality.

Description

Technical field [0001] The invention relates to the field of vanadium battery manufacturing, in particular, to a method for preparing a vanadium electrolyte of a high-energy 3.5-valent pure hydrochloric acid system. Background technique [0002] The vanadium flow battery (VRB) is known as the "new type of clean energy battery". It is a new type of new energy battery with a good application prospect, 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, large current lossless deep discharge, simple operation and maintenance, high reliability, long service life, and low pollution. It can be widely used in renewable energy storage (such as wind power , Photovoltaic), grid peak shaving, backup power supply and other fields. After decades of development, the technology has matured and has been industrialized in China, Japan, the United States, Aus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/184Y02E60/50
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 HUNAN YINFENG NEW ENERGY
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