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Novel high-stability electrolyte and application thereof

A high-stability, electrolyte-based technology, applied in the field of electrolyte, can solve problems such as easy to block batteries and pipelines, affect battery stability, and reduce battery capacity, achieving low cost, improved stability, and improved energy density.

Pending Publication Date: 2020-05-19
华秦储能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The supporting electrolyte used in the all-vanadium redox flow battery is an aqueous solution of sulfuric acid, and trivalent vanadium ions are easy to precipitate at a high proton concentration, which not only leads to a decrease in battery capacity, but also easily blocks the battery and pipelines, affecting the long-term operation of the battery. stability

Method used

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  • Novel high-stability electrolyte and application thereof
  • Novel high-stability electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare 1 mol / L trivalent vanadium solution by electrolysis, in which the concentration of sulfuric acid is 4 mol / L, add different stabilizers to 10 mL of trivalent vanadium solution respectively, the types and contents of stabilizers are shown in Table 1, mix well Afterwards, stir evenly, and place it at room temperature together with a blank 1mol / L trivalent vanadium solution sample, observe the state of the solution, and investigate the influence of different stabilizers on the thermal stability of trivalent vanadium.

[0023] The experimental results are shown in Table 1. As can be seen from Table 1, when no stabilizer is added, the stability time of trivalent vanadium is less than 3 days, adding nitrogen bromide methyl ethyl pyrrolidine, bromide nitrogen methyl ethyl morpholine, trimethyl bromide The stability time of trivalent vanadium is significantly prolonged when ammonium chloride is used, indicating that nitrogen methyl ethyl pyrrolidine bromide, nitrogen met...

Embodiment 2

[0028] The vanadium ion concentration of 3 mol / L, sulfuric acid concentration of 4 mol / L in the electrolyte of the vanadium redox flow battery experiment, the electrode is carbon felt, the current density is 80 mA / cm 2 . The electrolyte in a group of batteries does not contain stabilizers, and the electrolyte in a group of batteries contains 5 wt% nitrogen bromide methyl ethyl pyrrolidine stabilizer. The other experimental conditions are the same, and the experiment is carried out at the same time. The experimental results found that the negative electrode trivalent vanadium solid adhered to the carbon felt after running for about 70 cycles without a stabilizer, causing the carbon felt to harden, the electrolyte flow rate decreased, and the battery could not continue to operate. The battery with the pyrrolidine stabilizer has been operated for more than 300 cycles. When the battery is disassembled, it is found that there is no obvious solid precipitation at the negative electr...

Embodiment 3

[0030] An all-vanadium redox flow battery experiment was carried out with an electrolyte solution with a vanadium ion concentration of 2 mol / L and a sulfuric acid concentration of 4 mol / L. The electrode was carbon felt, and the current density was 80mA / cm 2 . The medium electrolyte contains 1 wt% nitrogen bromide methyl ethyl morpholine stabilizer. Experimental results show that the battery containing nitrogen bromide methyl ethyl morpholine stabilizer has been operated for more than 250 cycles. When the battery is disassembled, it is found that there is no obvious solid precipitation at the negative electrode, indicating that the stabilizer can effectively improve the stability of trivalent vanadium.

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Abstract

The invention relates to the field of electrolytes, in particular to a novel high-stability electrolyte and application thereof. The novel high-stability electrolyte is characterized in that the electrolyte is an aqueous solution containing vanadic oxide and sulfate radical, and also comprises quaternary ammonium salt. 1) quaternary ammonium salt is taken as the stabilizer of the all-vanadium redox flow battery negative electrode electrolyte to inhibit precipitation of trivalent vanadium under high proton concentration; 2) the stability of trivalent vanadium of the negative electrode is improved by adding the quaternary ammonium salt, so that the effect of improving the concentration of vanadium ions in the negative electrode electrolyte is achieved, and finally, the energy density of thebattery is improved, and 3) the preparation process is simple to operate, energy-saving, environment-friendly and low in cost, and can ensure that the battery can efficiently and stably run for a longtime.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to a novel high-stability electrolyte and its application. Background technique [0002] With the depletion of fossil energy all over the world and the continuous enhancement of people's awareness of environmental protection, renewable energy power generation technology is more and more popular. Renewable energy mainly includes wind energy, solar energy, biomass energy, ocean energy, etc., which are usually converted into electrical energy for use. These renewable energy power generation is obviously discontinuous and unstable due to the influence of geographical and meteorological conditions. In order to smooth and stabilize the power generation output of renewable energy, solve the time difference between power generation and power consumption, and improve power quality and grid reliability, it is necessary to develop high-efficiency energy storage technology. Vanadium redox flow bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 应忠芳郑建伟赵文超段鹏勇
Owner 华秦储能技术有限公司