Flow battery based on ternary eutectic solvent

A technology of deep eutectic solvent and liquid flow battery, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve problems such as ion migration resistance, increase diffusion coefficient, increase electrochemical reaction speed, reduce mass transfer and Effect of loss of pump power etc.

Active Publication Date: 2021-12-07
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the field of flow batteries, redox pairs are used as active substances to migrate and transfer energy. According to research in the field of extraction, the migrated redox ions participate in the construction of hydrogen bond networks and form supramolecular complexes, which have great resistance to ion migration.

Method used

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  • Flow battery based on ternary eutectic solvent
  • Flow battery based on ternary eutectic solvent
  • Flow battery based on ternary eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Choline chloride: ethylene glycol: glycerin according to the molar ratio of 1: 2: x (x = 0.1 ~ 1), prepared by magnetic heating and stirring at 100 ° C to obtain a transparent ternary deep eutectic solvent, cooled at room temperature spare. The prepared solvent should be sealed and stored in time to avoid contamination of the solvent by substances in the air.

[0028] Add active material FeCl to ternary deep eutectic solvent 3 ﹒ 6H 2 O, and heated and stirred at 100°C until it completely dissolved to form an orange-yellow electrolyte.

[0029] For the prepared electrolytes added with different molar ratios of glycerol at 50mV. the s -1 cyclic voltammetry

[0030] Line test, test data such as figure 2 shown. Viscometer and conductivity meter were used to test the changes in the physical properties of the electrolyte. The test results are shown in Table 1. Through combined analysis with the cycle test curve, when the molar ratio of glycerol is 0.5, the peak pote...

Embodiment 2

[0038] Prepare 0.1mol of ternary deep eutectic solvent as solvent. L -1 FeCl 2 ﹒ 4H 2 O Electrolyte, VCl 3 The electrolyte is stored in the positive and negative liquid storage tanks outside the flow battery respectively. The experimental device is as follows: Figure 4As shown, the main part of the flow battery is two current collectors made of graphite. The positive and negative electrodes are made of carbon felt, which are separated by Nafion212 ion exchange membrane. There is a 10mm X gap between each electrode and the graphite current collector. 10mm reaction area and 3mm thickness electrochemical reaction zone for the circulation of the liquid in the storage tank. Purge the connected flow battery pipeline with high-purity nitrogen for at least 20 minutes to avoid the influence of residual oxygen or water vapor in the pipeline. During the operation of the flow battery, through 25mL. min -1 The flow rate peristaltic pump circulates and pumps the electrolyte solutio...

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Abstract

The invention belongs to the technical field of flow batteries in electrochemical energy storage, and discloses a flow battery based on a ternary eutectic solvent. On the basis of a binary eutectic solvent, a neutral hydrogen bond donor / acceptor is added to form a ternary eutectic solvent, the electronegativity difference between the hydrogen bond donor and the hydrogen bond acceptor, the steric hindrance of the space structure and the bond length of the hydrogen bond are microscopically adjusted, a binary hydrogen bond network structure is reconstructed, and a eutectic solvent system more suitable for redox couple is established. After the chemical and physical properties of the solvent system are improved, specifically, the viscosity and electrochemical impedance of the eutectic solvent system are remarkably reduced. The most important advantage is that after the redox couple is added, the redox couple is in a free state instead of a supramolecular compound, and shows good transport performance in the flow battery.

Description

technical field [0001] The invention belongs to the technical field of flow batteries in electrochemical energy storage, and in particular relates to a flow battery based on a ternary deep eutectic solvent, which improves the electrochemical performance of the flow battery. Background technique [0002] The development of renewable energy has the defect of discontinuous and unstable power output, which needs to be solved by an efficient and low-cost energy storage system. Flow batteries are considered to be the most promising technology in large-scale energy storage due to their advantages of independent design of energy and power density. In recent years, flow batteries have made continuous progress in key materials such as electrolytes, ion exchange membranes, double-electrode plates, and electric pairs. Among them, the research on all-vanadium flow batteries proposed by Skyllas-Kazacos et al. has been relatively mature. Enter the stage of commercial application. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0025Y02E60/50
Inventor 徐谦路平李卓张玮琦苏华能马强
Owner JIANGSU UNIV
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