Alizarin flow battery negative electrode electrolyte, and alizarin flow battery adopting electrolyte

An anode electrolyte, flow battery technology, applied in the direction of alkaline electrolyte, fuel cell, aqueous electrolyte, etc., can solve the problems of high toxicity, high price, electrolyte penetration, etc.

Inactive Publication Date: 2017-09-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, VRFB active materials are generally small positively charged metal ions, and there is a common problem of electrolyte penetration, which seriously affects the energy efficiency and working life of the battery.
At the same time, vanadium ions are less reactive on carbon electrodes, which limits the power density of the battery.
In addition, VOSO 4 Expensive and highly toxic, restricting the application of flow batteries in a wider range of fields

Method used

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  • Alizarin flow battery negative electrode electrolyte, and alizarin flow battery adopting electrolyte
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  • Alizarin flow battery negative electrode electrolyte, and alizarin flow battery adopting electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Alizarin (1,2-dihydroxyanthraquinone) alizarin (1,2-dihydroxyanthraquinone) negative electrode electrolyte with a concentration of 0.05mol / L, potassium ferrocyanide positive electrode electrolyte with a concentration of 0.1mol / L, and 2mol / L NaOH as a supporting electrolyte are used to determine positive and negative The electrode ratio is 1:1 and loaded into the flow battery. The sulfonated polyetheretherketone membrane is used as the diaphragm. At room temperature, the NEWARE5V3A battery tester is used for 100 cycle tests. At a current density of 100mA / cm 2 , its coulombic efficiency is 98.6%, its energy efficiency is 78.7%, and its energy density is 1.2Wh / L. At current densities up to 200 and 300mA / cm 2 , the energy efficiency is 70.9% and 57.9% respectively, and the maximum power of the battery is 240mW / cm 2 .

Embodiment 2

[0066] Alizarin red (1,2-dihydroxyanthraquinone-3-sulfonic acid) negative electrode electrolyte with a concentration of 0.05mol / L, potassium ferrocyanide positive electrode electrolyte with a concentration of 0.1mol / L, and a supporting electrolyte of 2mol / L The KOH is loaded into the flow battery with the ratio of positive and negative electrodes 1:1, and Nafion212 is used as the diaphragm. At room temperature, the NEWARE5V3A battery tester is used for 100 cycle tests, and the current density is 100mA / cm 2 , its coulombic efficiency is 98.3%, its energy efficiency is 76.8%, and its energy density is 1.2Wh / L. At current densities up to 200 and 300mA / cm 2 , the energy efficiency is 65.5% and 53.8% respectively, and the maximum power of the battery is 240mW / cm 2 .

Embodiment 3

[0068] Alizarin fluorine blue (3-alizarin methylamine-N, N-diacetic acid) negative electrode electrolyte with a concentration of 0.1mol / L, potassium ferrocyanide positive electrode electrolyte with a concentration of 0.2mol / L, and a supporting electrolyte of 0.5 mol / L KOH was loaded into the flow battery with the ratio of positive and negative electrodes 1:1, and Nafion211 was used as the separator. At room temperature, the NEWARE5V3A battery tester was used for 100 cycle tests, and the current density was 50mA / cm 2 , its coulombic efficiency is 97.8%, its energy efficiency is 90.1%, and its energy density is 2.3Wh / L. When the current density is increased to 100, 200, 300, 400mA / cm 2 , the energy efficiency is 84.4%, 73.0%, 60.9%, 51.8%, and the maximum power of the battery is 320mW / cm 2 .

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Abstract

The invention provides an flow battery negative electrode electrolyte based on alizarin or derivatives thereof, and a flow battery adopting the electrolyte as a negative electrode. The electrolyte is an alkaline aqueous solution containing the alizarin or the derivatives thereof. The alizarin and the derivatives contain at least one of alizarin (1,2-dihydroxyanthraquinone), alizarin red (1,2-dihydroxyanthraquinone-3-sulfonic acid) or alizarin fluorin blue (3-alizarin methylamine-N,N-diacetic acid and mixtures thereof. An alkali used in the invention comprises at least one of sodium hydroxide, potassium hydroxide and a sodium hydroxide and potassium hydroxide mixture. The working temperature of the electrolyte is 10-50 DEG C; and the flow battery based on the electrolyte is a traditional structure, and comprises a positive electrode liquid storage tank 1, a positive electrode electrolyte 3, a negative electrode liquid storage tank, the negative electrode electrolyte 4, pumps 7 and 8, and a cation exchange membrane 9 for conducting cations. The active substance of the alizarin flow battery negative electrode electrolyte is bulk anions, and difficultly penetrates through a proton exchange membrane; and the electrolyte disclosed in the invention has the characteristics of no toxicity, no pollution, no rare earth elements, and obvious price advantage.

Description

technical field [0001] The invention relates to an alizarin-based liquid flow battery negative electrode electrolyte and a flow battery using the same. technical background [0002] The consumption of fossil energy and the increasing demand have brought about problems such as environmental pollution and energy crisis, which seriously threaten the survival and development of human beings. Vigorously developing and utilizing renewable clean energy such as solar energy, wind energy, and water energy can effectively reduce dependence on fossil energy and environmental pollution. However, the inherent volatility and immediacy of renewable energy have restricted its wide application. The development of efficient energy storage technology can promote the development of renewable energy technology market and ensure the energy security of national resources. [0003] As a green and efficient large-scale energy storage and conversion device, flow battery (RFB) has attracted the atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M8/0234
CPCH01M8/0234H01M8/188H01M2300/0014Y02E60/50
Inventor 相艳刘祎阳卢善富
Owner BEIHANG UNIV
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