Preparation method of electrolyte of iron-chromium flow battery and obtained electrolyte

A liquid flow battery and electrolyte technology, applied in the field of energy storage, can solve the problems of reducing battery performance, ion crossing and interlinking, etc., to achieve the effect of increasing the precipitation potential, reducing the amount of hydrogen evolution, and slowing down the performance decay

Active Publication Date: 2022-05-27
中海储能科技(北京)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Electrolytes with different positive and negative electrodes, due to the different osmotic pressures on both sides of the membrane, are prone to ion cross-linking, thereby reducing battery performance

Method used

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  • Preparation method of electrolyte of iron-chromium flow battery and obtained electrolyte
  • Preparation method of electrolyte of iron-chromium flow battery and obtained electrolyte
  • Preparation method of electrolyte of iron-chromium flow battery and obtained electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Prepare a 4 mol / L hydrochloric acid solution, add a certain amount of propylenediaminetetraacetic acid and chromium ion complex CrPDTA into the prepared hydrochloric acid solution, and stir with a magnetic bar for 2 hours at a temperature of 60 °C to form a uniform solution. solution. The preparation process of the complex is as follows: 40g KCr(SO4) 2 ·12H 2 O and 27.5 g PDTA were dissolved in deionized water at 100 °C. After heating for 1 h, 10 g KOH was added slowly. After 24 h, 16 mL of 5 mol / L KOH was slowly added in 1 mL increments. The process continued for 72 h, so that the final The pH of the solution is between 5 and 6, the solution is cooled to room temperature, 90 mL of acetone is added, and K is precipitated to remove 2 SO 4 , diluted with deionized water to obtain a 1 mol / L K[CrPDTA] solution.

[0051] (2) Prepare a 4 mol / L hydrochloric acid solution, add a certain amount of ferric chloride and ferrous chloride to the prepared hydrochloric acid sol...

Embodiment 2

[0054] (1) Prepare a 4 mol / L hydrochloric acid solution, add a certain amount of red carbon quantum dots and chromium chloride into the prepared hydrochloric acid solution, at 60 o At the temperature of C, the solution was stirred with a magnet for 2 h to form a homogeneous solution, in which the concentration of red carbon quantum dots was 0.2 mol / L and the concentration of chromium chloride was 0.25 mol / L. Among them, the preparation process of the red carbon quantum dot additive is as follows. Weigh 0.01 g of torus acid and 0.35 g of o-phenylenediamine, add them into a hydrothermal reaction kettle, add 10 ml of aqueous sulfuric acid (3.4 mol / L) to dissolve, and dissolve at 210 o Heated at C for 10h. The prepared solution was filtered through a membrane filter (0.22 μm), then precipitated with NaOH aqueous solution, and 3 ml of quantum dot solution was added with 5 ml of 2.5 mol / L NaOH aqueous solution. Finally, the pellet was collected by centrifugation at 10,000 rpm / min f...

Embodiment 3

[0058] (1) Prepare a 4 mol / L hydrochloric acid solution, add a certain amount of zinc-doped blue carbon quantum dots and chromium chloride into the prepared hydrochloric acid solution, at 60 o At the temperature of C, the solution was stirred with a magnet for 2 h to form a homogeneous solution, in which the concentration of zinc-doped blue carbon quantum dots was 0.2 mol / L, and the concentration of chromium chloride was 0.25 mol / L. Among them, the preparation process of zinc-doped blue carbon quantum dot additive is as follows. Weigh 1.74 g of sodium citrate and 0.35 g of zinc chloride samples respectively and dissolve sodium citrate and zinc chloride in 50 mL of ultrapure water. The concentration ratio is 1:0.5. After fully dissolving the solution, add it to a hydrothermal kettle with a total volume of 100 mL. in 185 o C for 4 hours. After cooling to room temperature, filter through a 0.22 µm disposable syringe filter and then filter through a Spirax dialysis bag 100-500 ...

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Abstract

The invention discloses a preparation method of an electrolyte of an iron-chromium flow battery and the obtained electrolyte. The electrolyte is prepared by adding one or more additives into a basic electrolyte of ferric chloride, ferrous chloride, chromium chloride and hydrochloric acid. The invention particularly introduces an additive of the electrolyte, wherein the additive comprises one or more of ammonium chloride, propylene diamine tetraacetic acid, indium chloride, carbon quantum dots and Mxene quantum dots; and the concentration of the additive in the electrolyte is 0.1-30 mol/L. Compared with the prior art, the additive introduced in the invention can be directly added in the process of preparing the electrolyte without introducing a subsequent additional adding process, so that the preparation process is simple, the property of the electrolyte cannot be changed, and the electrolyte is non-toxic, harmless, low in price, safe and environment-friendly. The activity of positive and negative electrode redox reaction can be effectively improved, the battery performance is improved, and the side reaction of cathode hydrogen evolution is inhibited.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and particularly relates to an electrolyte for an iron-chromium redox flow battery and a preparation method thereof. Background technique [0002] Flow battery is considered as one of the preferred technologies for large-scale energy storage technology. It has the advantages of high safety, long cycle life, recyclable electrolyte, and environmental friendliness. It can store energy for a long time and realize peak and valley regulation of the power grid. This will improve the grid's ability to absorb renewable energy generation. Fe-chromium flow battery The positive and negative electrode pairs of Fe-chromium flow battery are Fe 2+ / Fe 3 + and Cr 2+ / Cr 3+ , using iron ions and chromium ions with abundant raw materials and low prices as active substances, which has a large low-cost advantage; the operating temperature range is -20~70oC, and the environmental adaptability is good; the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18C01B32/15C01B32/914C01B32/921B82Y20/00B82Y40/00C09K11/65
CPCH01M8/188C01B32/15C01B32/921C01B32/914B82Y20/00B82Y40/00C09K11/65H01M2300/0091Y02E60/50
Inventor 徐泉曾建华牛迎春王屾杨子骥
Owner 中海储能科技(北京)有限公司
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