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Aqueous organic flow battery electrolyte, preparation method thereof and aqueous organic flow battery

A flow battery and organic electrolyte technology, applied in the field of aqueous organic flow battery electrolyte and aqueous organic flow battery, can solve the problems of poor water solubility of products, limited application, increased battery cost, etc., to avoid chemical modification modification, The effect of improving solubility and improving energy density

Inactive Publication Date: 2019-04-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some cheap organic molecules have redox activity, but their own or products after gaining and losing electrons are poorly water-soluble, requiring further chemical modification, which increases the cost of batteries and limits their application in aqueous organic flow batteries.

Method used

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  • Aqueous organic flow battery electrolyte, preparation method thereof and aqueous organic flow battery
  • Aqueous organic flow battery electrolyte, preparation method thereof and aqueous organic flow battery
  • Aqueous organic flow battery electrolyte, preparation method thereof and aqueous organic flow battery

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preparation example Construction

[0038]The present application also provides a method for preparing an electrolyte for an aqueous organic liquid flow battery, comprising the following steps:

[0039] The organic electrolyte and coating are added to the supporting electrolyte solution to obtain an electrolyte solution; the coating is a cyclic molecule with a hydrophilic outer edge, a hydrophobic inner cavity and a cavity, and the organic electrolyte itself is poorly water-soluble or An electrolyte with poor water solubility after gaining and losing electrons.

[0040] In the above-mentioned process of preparing the electrolyte solution, the organic electrolyte, the coating, and the supporting electrolyte solution are mixed to obtain an electrolyte solution comprising an electrolyte composite in which the organic electrolyte is coated with the coating and a supporting electrolyte solution.

[0041] The above-mentioned raw material organic electrolyte, coating and supporting electrolyte solution have been descri...

Embodiment 1

[0047] Weigh 0.584g NaCl in a beaker, add 10mL deionized water, stir to dissolve; weigh 0.186g Fc and add it to the beaker, Fc is insoluble in water; weigh 4.625g hydroxypropyl-β-cyclodextrin (HP-β- CD) was added into a beaker, and stirred until Fc was completely dissolved, and then an aqueous organic flow battery anode electrolyte in which Fc was coated with 3 times HP-β-CD could be prepared. Due to the increase in solution volume due to the addition of cyclodextrin, its concentration is less than 0.1MFc, 0.3M HP-β-CD, 1M NaCl.

[0048] figure 1 yes (3 times) The cyclic voltammogram of the electrolyte, in which a pair of redox peaks at 0.50V vs. SHE corresponds to a single-electron redox reaction.

[0049] The Fc obtained in Example 1 is used to coat the positive electrolyte of the aqueous organic flow battery with 3 times HP-β-CD and BTMAP-Vi to form a flow battery. The speed of the peristaltic pump is 60rpm, and the positive and negative electrodes of the battery are bot...

Embodiment 2

[0052] Weigh 0.584g NaCl in a beaker, add 10mL deionized water, stir to dissolve; weigh 0.186g Fc, Fc is insoluble in water; weigh 6.167g HP-β-CD and add it to a beaker, stir until Fc is completely dissolved, then you can Aqueous organic flow battery cathode electrolyte with Fc coated on 4 times HP-β-CD was prepared. Due to the increase in solution volume due to the addition of cyclodextrin, its concentration is less than 0.1MFc, 0.4M HP-β-CD, 1M NaCl.

[0053] The Fc obtained in Example 2 is used to coat the positive electrode electrolyte of the water-based organic flow battery with 4 times HP-β-CD and BTMAP-Vi to form a flow battery. The speed of the peristaltic pump is 60rpm, and the positive and negative electrodes of the battery are both effective Area is 5cm 2 Carbon paper, the positive and negative electrodes are separated by an anion exchange membrane. Figure 6 yes (4 times) / BTMAP-Vi flow battery at 40mA / cm 2 The charge and discharge test curve graph under the cu...

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Abstract

The invention provides an aqueous organic flow battery electrolyte. The aqueous organic flow battery electrolyte is composed of an electrolyte compound and a supporting electrolyte solution. The electrolyte compound is composed of an organic electrolyte and a coating material for coating the organic electrolyte. The coating material is an annular molecule with a hydrophilic outer edge, a hydrophobic inner cavity and a cavity. The organic electrolyte is an electrolyte poor in water solubility on its own or a product poor in water solubility after gaining and losing electrons. The invention alsoprovides a preparation method of the aqueous organic flow battery electrolyte. The invention also provides an aqueous organic flow battery. The electrolyte provided by the invention can replace the modification step of the organic electrolyte. The organic electrolyte poor in water solubility is directly applied to the aqueous flow battery, so that the cost of the flow battery is reduced.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries, in particular to an electrolyte for an aqueous organic liquid flow battery, a preparation method thereof, and an aqueous organic liquid flow battery. Background technique [0002] Stationary energy storage, a key component of grid modernization, offers a cost-effective approach to integrating renewable energy, balancing supply-demand mismatches, and improving overall grid efficiency and resilience. As an efficient large-scale energy storage technology, flow batteries have attractive properties that the electrolyte and electrodes are spatially separated, not only highly safe, but also the energy and power output of the battery can be adjusted independently, compared with solid-state batteries, It has significant advantages in meeting the various needs of different grid energy markets. [0003] So far, electrolytes for aqueous flow batteries are mainly limited to transition metals, s...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0002H01M2300/0094Y02E60/50
Inventor 杨正金徐铜文李圆圆
Owner UNIV OF SCI & TECH OF CHINA
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