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Deep eutectic solvent for flow battery, electrolyte and flow battery

A technology of deep eutectic solvent and flow battery, which is applied in the field of electrolyte, flow battery and deep eutectic solvent, which can solve the problems of unfavorable ion transfer electrolyte diffusion and limited application range, so as to reduce the internal resistance of the solution and improve the conductivity , easy-to-obtain effect

Pending Publication Date: 2019-08-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high viscosity of the deep eutectic solvent is not conducive to the transfer of ions and the diffusion of the electrolyte dissolved in it, thus limiting its application range.

Method used

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  • Deep eutectic solvent for flow battery, electrolyte and flow battery
  • Deep eutectic solvent for flow battery, electrolyte and flow battery
  • Deep eutectic solvent for flow battery, electrolyte and flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] First, mix choline chloride and ethylene glycol according to the molar ratio of 1:2, heat to 70-90°C, keep stirring at this temperature until a colorless and transparent deep eutectic solvent is formed, and cool at room temperature .

[0051] The positive and negative active material FeCl 2 at 0.1mol L -1 Add the concentration of DES to 30mL DES to prepare a DES-based electrolyte solution.

[0052] Ethylene carbonate (EC) and dimethyl carbonate (DMC) were mixed according to a volume ratio of 1:1 to form a mixed solution of ethylene carbonate and dimethyl carbonate, which was added to the prepared positive electrode electrolyte solution in an amount of 12.5 vol%.

[0053] Utilize cyclic voltammetry to test the peak current density and peak potential of the positive electrode electrolyte solution before and after adding the mixed solution of ethylene carbonate and dimethyl carbonate, as figure 2 shown. The increase of the peak current density and the decrease of the ...

Embodiment 2

[0056] Mix choline chloride and ethylene glycol uniformly at a molar ratio of 1:2, continue stirring at a heating temperature of 70-90°C until a colorless and transparent deep eutectic solvent is formed, and cool at room temperature.

[0057] The positive and negative active material FeCl 2 and VCl 3 0.1mol·L -1 Add the concentration of DES to 60mL DES to prepare a DES-based electrolyte solution.

[0058] Since Sb ions will adhere to the surface of graphite felt during charge and discharge, they can play a catalytic role in the electrode reaction, and different doses of antimony chloride (SbCl 3 ) was added to the prepared negative electrode electrolyte solution, and the addition of SbCl was measured by cyclic voltammetry 3 The peak current density and peak potential of the negative electrode electrolyte solution before and after. Experimentally measured, adding antimony chloride (SbCl 3 ) optimal dosage is 15mmol / L, adding SbCl 3 The peak current density and peak potent...

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Abstract

The invention provides a deep eutectic solvent for a flow battery, an electrolyte and the flow battery, and the deep eutectic solvent is prepared by the following steps: uniformly mixing a hydrogen bond receptor and a hydrogen bond donor at a molar ratio of 1: 2, and adding one or more of the following additives after a heating reaction: the mixed solution of EC and DMC, non-noble metal ions withcatalytic action and polar gas. The diffusion coefficient of ions in the electrolyte of the flow battery can be improved, the internal resistance of the battery is reduced, and the charge-discharge performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of flow batteries, in particular to a deep eutectic solvent, an electrolyte and a flow battery for the flow batteries. Background technique [0002] Flow batteries have been extensively studied since they were proposed by Thaller in 1974. The research on flow battery technology has gone through stages of development from water systems to non-aqueous systems. Due to the influence of water decomposition, the working potential window of aqueous flow batteries is generally very narrow (<2V) and its potential power output is limited. Organic solvents provide a higher potential window for higher power and energy output. However, organic solvents pose certain safety hazards due to their volatility, toxicity, and flammability, and contamination by moisture or oxygen can adversely affect battery performance. Therefore, the researchers proposed to use ionic liquids and deep eutectic solvents to solve this problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0037Y02E60/50
Inventor 徐谦纪燕男苏华能马强张玮琦
Owner JIANGSU UNIV