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Salt cavern-based aqueous organic flow battery system

A technology for flow batteries and systems, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of limited solubility of active materials, low Coulomb efficiency, and corrosive electrolytes that are not environmentally friendly and safe

Active Publication Date: 2021-05-07
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 liquid flow batteries still face some challenges, such as limited solubility of active materials (organic substances), easy cross-contamination of electrolyte, low operating current density, and prone to water electrolysis side reactions, etc.

Method used

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  • Salt cavern-based aqueous organic flow battery system
  • Salt cavern-based aqueous organic flow battery system
  • Salt cavern-based aqueous organic flow battery system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The negative electrode active material in the negative electrode electrolyte solution 23 is 0.05mol L -1 riboflavin, the positive electrode active material in the positive electrode electrolyte solution 22 is 0.1mol L -1 Potassium ferrocyanide, the supporting electrolyte in the positive electrolyte 22 and the negative electrolyte 23 is 2.5mol L -1 Sodium chloride solution, the pH regulator NaOH was used to adjust the pH of the solution to 14.0, and the coulombic efficiency, voltage efficiency and energy efficiency of the single cell of the salt cavern-based aqueous system organic flow battery system (I) were assembled as shown in Table 1 shown.

Embodiment 2

[0076] The negative electrode active material in the negative electrode electrolyte solution 23 is 0.05mol L -1 riboflavin, the positive electrode active material in the positive electrode electrolyte solution 22 is 0.1mol L -1 Potassium ferrocyanide, the supporting electrolyte in the positive electrolyte 22 and the negative electrolyte 23 is 2.5mol L -1 Sodium chloride solution, using the pH regulator NaOH to adjust the pH of the solution to 11.0, the coulombic efficiency, voltage efficiency and energy efficiency of the single cell of the salt cavern-based aqueous system organic flow battery system (II) assembled are shown in Table 1 shown.

Embodiment 3

[0078] The negative electrode active material in the negative electrode electrolyte solution 23 is 0.05mol L -1 riboflavin, the positive electrode active material in the positive electrode electrolyte solution 22 is 0.1mol L -1 Potassium ferrocyanide, the supporting electrolyte in the positive electrolyte 22 and the negative electrolyte 23 is 2.5mol L -1 Sodium chloride solution, using the pH regulator NaOH to adjust the pH of the solution to 10.0, the coulombic efficiency, voltage efficiency and energy efficiency of the single cell of the salt cavern-based aqueous system organic flow battery system (Ⅲ) assembled are shown in Table 1 shown.

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Abstract

The invention discloses an organic liquid flow battery system based on a salt cavern-based water phase system, which includes: two electrolyte storages, the electrolyte storage is a salt cave with a physical dissolution cavity formed after the mining of salt mines, and the electrolyte storage There is an electrolyte in the cavity, and the electrolyte includes a positive active material, a negative active material and a supporting electrolyte, the positive active material is potassium ferrocyanide or sodium / potassium ferricyanide or a sodium compound; the negative active material is an alloxazine compound or Riboflavin and its derivatives, the positive active material and the negative active material are directly dissolved or dispersed in the system with water as the solvent in bulk form, and the supporting electrolyte is dissolved in the system; the flow battery stack and the flow battery stack are respectively combined with the two connected to the electrolyte reservoir. The salt cavern-based aqueous organic flow battery system not only has the advantages of 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 caverns. resource.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04186H01M8/18
CPCH01M8/04186H01M8/188Y02E60/50
Inventor 徐俊辉韩俊甜崔耀星苏志俊李丹马旭强陈留平
Owner CHINASALT JINTAN