Organic liquid flow battery system for aqueous system based on salt cavern

Abstract

The invention discloses an organic liquid flow battery system for an aqueous system based on a salt cavern. The organic liquid flow battery system comprises two electrolyte reservoirs and liquid flowbattery stacks, wherein the electrolyte reservoirs are salt caverns with physical cavities formed after the salt mine is mined, electrolytes are stored in the cavities and comprise a positive active material, a negative active material and a support electrolyte, the positive active material is a 2,2,6,6-tetramethylpiperidine oxynitride compound, the negative active material is anthraquinones, thepositive active material and the negative active material are directly dissolved or dispersed in a system in which water is used as a solvent in ontological form, the support electrolyte is dissolvedin the system; and the liquid flow battery stacks are respectively connected to the two electrolyte reservoirs. The organic liquid flow battery system for an aqueous system based on a salt cavern notonly has the advantages such as low cost, high safety performance, stable charge and discharge performance and high solubility of active materials, but also can solve large-scale electrochemical energy storage and make full use of some abandoned salt cavern resources.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and in particular relates to an organic liquid flow battery system based on a salt cavern-based aqueous phase system, which can be applied to large-scale chemical energy storage. Background technique [0002] With the rapid development of the human economy, environmental pollution and energy shortages are becoming more and more serious, prompting countries all over the world to develop and utilize renewable energy such as wind energy, solar energy, and tidal energy. However, these renewable energy sources are discontinuous, unstable, restricted by regional environment, and difficult to connect to the grid, resulting in low utilization rate, high wind and light abandonment rate, and waste of resources. Therefore, it is necessary to vigorously develop efficient, cheap, safe and reliable energy storage technology that can be used in conjunction with it. [0003] Among various electrochemical en...

AI Technical Summary

Problems solved by technology

However, considering the limited vanadium ore resources and high vanadium ore prices in the world (V 2 o 5 , $20 / kg), the popularization and long-term use of vanadium redox flow batteries are difficult to achieve

Vanadium flow batteries and zinc-bromine flow batteries are traditional flow battery technologies, which have some technical defects: such as self-discharge and low Coulombic efficiency caused by the shuttle effect of active materials between electrodes; corrosive electrolytes are not environmentally friendly and safe Hidden danger

[0005] At present, aqueous flow batteries still face some challenges, especially in the design of molecular materials, such as limited solubility of active materials (organic substances), easy cross-contamination of electrolytes, low operating current density, and prone to water electrolysis side reactions, etc.

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