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Organic phase electrolyte and application thereof in negative electrode of redox flow battery

An organic phase and electrolyte technology, applied in the direction of regenerative fuel cells, can solve the problems of high price, complicated preparation process, low solubility, etc., and achieve the effect of improving energy density, low electrochemical potential, and increasing cycle life

Inactive Publication Date: 2017-05-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as active substances, metal complexes have the disadvantages of complex preparation process, high price and low solubility.

Method used

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  • Organic phase electrolyte and application thereof in negative electrode of redox flow battery
  • Organic phase electrolyte and application thereof in negative electrode of redox flow battery
  • Organic phase electrolyte and application thereof in negative electrode of redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh benzophenone and tetraethylammonium hexafluorophosphate and dissolve them in acetonitrile to prepare 25ml electrolyte solution. The molar concentrations of benzophenone and tetraethylammonium hexafluorophosphate in acetonitrile are 0.01mol / L and 0.1mol / L, respectively. After passing the above electrolyte into nitrogen to remove oxygen, test it with a three-electrode system to obtain the cyclic voltammetry curve of the benzophenone electrolyte. The reference electrode, the counter electrode and the working electrode are respectively Ag / Ag + electrode, graphite electrode and glassy carbon electrode.

Embodiment 2

[0028] Weigh benzophenone and tetraethylammonium tetrafluoroborate and dissolve them in acetonitrile to prepare 30ml electrolyte solution. The molar concentrations of benzophenone and tetraethylammonium tetrafluoroborate in acetonitrile were 0.01 mol / L and 0.03 mol / L, respectively. After passing the above electrolyte solution into nitrogen to remove oxygen, it is tested with a three-electrode system to obtain a cyclic voltammetry curve of the benzophenone electrolyte solution. The reference electrode, counter electrode and working electrode are Ag / Ag + electrode, graphite electrode and glassy carbon electrode.

Embodiment 3

[0030] Weigh anthrone and tetraethylammonium tetrafluoroborate and dissolve them in acetonitrile to prepare 25ml electrolyte solution. The molar concentrations of anthrone and tetraethylammonium tetrafluoroborate in acetonitrile are 0.01 mol / L and 0.3 mol / L, respectively. After passing the above electrolyte solution into nitrogen to remove oxygen, it is tested with a three-electrode system to obtain the cyclic voltammetry curve of the anthrone electrolyte solution. The reference electrode, counter electrode and working electrode are Ag / Ag + electrode, graphite electrode and glassy carbon electrode.

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Abstract

The invention discloses an organic phase electrolyte and an application thereof in a negative electrode of a redox flow battery. The organic phase electrolyte consists of active materials, a supporting electrolyte and an organic solvent, wherein the active materials are diphenyl ketone and a derivative thereof, anthrone and a derivative thereof, or dibenzoyl methane and a derivative thereof; the supporting electrolyte is selected from tetraethylammonium hexafluorophosphate, tetraethylammonium tetrafluoroborate, tetrabutylammonium hexafluorophosphate or tetrabutylammonium tetrafluoroborate; and the organic solvent is selected from acetonitrile, tetrahydrofuran, propylene carbonate, ethylene carbonate, dimethyl sulfoxide, dimethylformamide, glycol dimethyl ether or ethylene glycol diethyl ether. The organic phase electrolyte disclosed by the invention has relatively low electrochemical potential and high electrochemical property; when the organic phase electrolyte is used as the negative electrode electrolyte of the redox flow battery for assembling an organic phase redox flow battery, relatively high open-circuit voltage can be realized, so that the energy density of the battery can be improved; and meanwhile, the capacity fading of the battery can be lowered, so that the cycle life of the battery can be prolonged.

Description

technical field [0001] The invention belongs to the field of energy storage redox flow batteries, and in particular relates to an organic phase liquid flow battery negative electrode electrolyte. Background technique [0002] Redox flow battery (RFB) is considered to be one of the most promising large-scale energy storage technologies due to its advantages of low cost and high safety. By storing the electrolyte with dissolved actives in an external liquid storage tank, the energy capacity and power density are independently adjustable, thereby providing design freedom for RFBs of various power and energy storage scales. Although the traditional RFB has made significant commercial progress, the energy density of most RFB systems is less than 25Wh L -1 , limiting its further application. This is mainly due to the narrow electrochemical window of water as a solvent. In comparison, organic solvents have a wider electrochemical window and better electrochemical stability. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/18Y02E60/50
Inventor 李永丹邢学奇赵宜成
Owner TIANJIN UNIV
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