Hexasubstituted Radialene Compounds for Aqueous Redox Flow Batteries
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Solution Overview
Problem
Designing stable and soluble organic active species for neutral pH aqueous redox flow batteries remains a challenge, as conventional inorganic materials are costly and pose safety concerns, while traditional organic species are reactive in aqueous environments.
Innovation Solution
Hexasubstituted [3] radialene compounds with specific moieties like ester, amide, amine, and polyalkylene oxide are developed, providing desirable water solubility and reversible redox activity, allowing their use as catholytes in aqueous redox flow batteries, potentially eliminating the need for supporting electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inorganic materials are used as redox couples, then electrochemical energy storage performance is improved, but cost and safety issues worsen
Solution Approach 1:
The patent changes the chemical composition parameters from inorganic materials to organic small molecules, specifically using compounds with reversible redox couples. This substitution maintains electrochemical performance while eliminating the cost and safety problems associated with inorganic materials like vanadium and zinc/brine systems.
Solution Approach 2:
The patent employs inexpensive organic compounds that can be synthesized from readily available precursors. These organic active species replace expensive inorganic materials, providing a cost-effective solution for grid-scale energy storage without compromising electrochemical performance.
2Ease of manufacture
If traditional organic species are used in aqueous environments, then cost is reduced, but stability and solubility worsen
Solution Approach 1:
The patent designs composite organic molecules that combine hydrophobic cores with hydrophilic substituents. This composite structure enables water solubility while maintaining the stability and redox activity of the organic active species, resolving the contradiction between cost-effectiveness and performance.
Solution Approach 2:
The patent applies local quality modification by introducing specific functional groups (such as sulfonate, carboxylate, or hydroxyl groups) at specific positions on the organic molecule. These localized modifications enhance water solubility and stability without compromising the overall redox activity of the compound.
3Object-affected harmful factors
If organic active species are designed for neutral pH, then safety and environmental friendliness are improved, but solubility and stability worsen
Solution Approach 1:
The patent adjusts the pH parameter to neutral conditions and simultaneously modifies the molecular structure of organic active species to maintain solubility and stability at this pH. This is achieved by incorporating ionizable functional groups that remain stable and soluble at neutral pH, eliminating the need for corrosive acids or bases.
Solution Approach 2:
The patent uses neutral pH as an intermediary condition that balances safety/environmental friendliness with solubility and stability. By designing organic compounds that function optimally at neutral pH, the system achieves non-corrosive operation while maintaining adequate solubility and stability for practical energy storage applications.
4Reliability
If hexasubstituted radialene compounds are used as catholytes, then water solubility and reversible redox activity are improved, but molecular complexity increases
Solution Approach 1:
The patent segments the molecular design into distinct functional modules: a radialene core providing redox activity and six substituent positions for solubility enhancement. This modular approach allows systematic optimization of solubility and redox properties while managing molecular complexity through structured design.
Solution Approach 2:
The hexasubstituted radialene structure serves multiple functions simultaneously: the core provides reversible redox activity for energy storage, while the six substituent positions collectively provide water solubility, stability, and electrochemical activity. This multi-functionality reduces the need for separate additives or components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These compounds exhibit high solubility, stability, and reversible redox properties, enabling efficient and durable operation of aqueous redox flow batteries at neutral pH, with enhanced cycling performance and reduced capital costs.
Implementation Method 1
hexasubstituted [3] radialene compounds exhibit desirable water solubility and reversible redox activity in aqueous solutions
Data Source
AI summary
Hexasubstituted [3] radialene compounds are described herein. In some embodiments, the hexasubstituted [3] radialene compounds exhibit desirable water solubility and reversible redox activity in aqueous solutions, thereby facilitating employment of such compounds in aqueous redox flow batteries.