Organic Flow Cell Battery Dual-Electrode Redox Design
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Solution Overview
Problem
The wide-scale utilization of flow batteries is limited by the availability and cost of toxic inorganic redox materials, and existing organic redox materials face challenges in achieving high energy density and stability due to reactivity and leakage issues through the separator membrane.
Innovation Solution
An organic flow cell battery design utilizing a single organic molecule for both electrodes, enabling 2×2-electron redox processes that are stable in the central state, reducing material costs and preventing chemical incompatibility, with the molecule being designed for high reactivity in oxidized and reduced forms to achieve high operating potential and long battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inorganic redox materials such as vanadium salts or bromine are used, then high redox potential and energy density are achieved, but toxicity and material cost increase
Solution Approach 1:
The patent replaces expensive and toxic inorganic redox materials (vanadium salts, bromine) with inexpensive organic redox materials that can be readily synthesized. The organic molecules serve as disposable, renewable energy storage media that can be replaced without environmental contamination concerns, directly addressing both cost and toxicity issues while maintaining energy density through efficient molecular design
Solution Approach 2:
The patent employs composite organic redox materials combining multiple functional moieties within single molecules or paired molecules. These composite structures integrate high-redox-potential groups with stability-enhancing and membrane-incompatibility-reducing groups, achieving a balance between energy density, stability, and biocompatibility that pure inorganic materials cannot provide
2Object-affected harmful factors
If organic redox materials are used to reduce toxicity and cost, then material safety and availability improve, but energy density and stability decrease due to reactivity and leakage
Solution Approach 1:
The patent applies local quality by introducing specific functional groups at particular positions within organic redox molecules. Electron-withdrawing groups are placed at strategic locations to modulate redox potential and enhance stability, while hydrophobic or sterically bulky groups are positioned to reduce membrane permeability. This localized modification allows independent optimization of toxicity, energy density, and stability parameters
Solution Approach 2:
The patent uses ion-permeable membranes as intermediaries that are specifically designed to be incompatible with organic redox materials. These membranes act as barriers that prevent organic molecule leakage while allowing ion transport, thereby stabilizing the battery system without compromising the benefits of organic redox materials. The membrane serves as a mediator between the organic electrolyte and the electrochemical reactions
3Power
If different organic molecules are used for cathode and anode to achieve high cell potential, then operating voltage increases, but material cost and system complexity increase
Solution Approach 1:
The patent employs universal organic redox molecules that can function at both cathode and anode positions. The same organic molecule undergoes reversible oxidation and reduction reactions, serving dual functions as both electron acceptor and donor. This multi-functionality simplifies the battery system by eliminating the need for separate cathode and anode materials, reducing complexity while maintaining high cell potential through optimized molecular redox properties
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
This approach allows for a cost-effective, high-energy-density battery with reduced toxicity, improved stability, and extended lifetime by using the same organic molecule on both sides of the separator, minimizing material costs and potential side reactions.
Implementation Method 1
an organic molecule that can be used as the electroactive redox material for both electrodes of the battery
Data Source
AI summary
The present invention relates to an organic flow cell battery having a material comprising an organic molecule that can be used as the electroactive redox material for both electrodes of the battery. By enabling two-electron processes both of the oxidation and reduction to occur in a single molecule, a total of 4-electron transitions is achieved, which allows the organic molecule to be used on both sides of the separator, reducing material costs and allowing the battery to be charge in either direction with equal ease.