Organic Redox Flow Battery Electrolytes for Safer Scalable Storage
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Solution Overview
Problem
Existing redox flow batteries face challenges such as high costs, reliance on toxic materials, safety risks, and limited scalability due to the use of inorganic redox materials, which hinder their widespread implementation in large-scale energy storage systems, particularly for renewable energy integration.
Innovation Solution
Development of novel organic redox active species, such as 9,10-anthraquinone-2,7-disulphonic acid (AQDS) and 1,2-benzoquinone-3,5-disulfonic acid (BQDS), which are inexpensive, highly soluble, and exhibit fast electrode kinetics, reducing the need for precious-metal electrocatalysts and minimizing toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If inorganic redox materials (such as vanadium salts or bromine) are used in redox flow batteries, then the battery capacity and energy storage capability are improved, but toxicity and associated health and environmental risks increase
Solution Approach 1:
The patent changes the chemical composition parameter from inorganic redox materials to organic redox-active compounds, specifically using quinone and hydroquinone derivatives that offer comparable or superior energy storage capacity without the toxic environmental impact of traditional inorganic materials like vanadium salts or bromine
Solution Approach 2:
The patent employs organic redox-active compounds that are inexpensive, readily available, and can be easily replaced or regenerated, eliminating the need for expensive precious-metal electrocatalysts while maintaining cost-effective energy storage operation
2Use of energy by moving object
If inorganic redox materials based on transition metals are used, then the redox potential and energy density are improved, but costs and availability issues increase
Solution Approach 1:
The patent replaces expensive inorganic transition metal-based redox materials with inexpensive organic redox-active compounds such as quinone and hydroquinone derivatives, which are commercially available and do not require costly precious-metal electrocatalysts, thereby significantly reducing manufacturing costs
Solution Approach 2:
The patent changes the material class from inorganic to organic compounds while maintaining or improving energy density through the selection of specific redox-active organic molecules with optimized electrochemical properties
3Quantity of substance
If inorganic redox materials are used in distributed modular energy generation, then the energy storage capacity is improved, but safety risks including overheating, fire, or explosion increase
Solution Approach 1:
The patent changes the chemical nature of the redox materials from inorganic to organic compounds with inherently safer thermal and chemical stability profiles, eliminating fire and explosion risks while maintaining energy storage capacity in distributed modular systems
Solution Approach 2:
The patent converts the potential harm of using inorganic materials with safety risks into a benefit by selecting organic redox-active compounds that provide equivalent or superior energy storage with enhanced safety, making the system suitable for distributed and modular applications
4Device complexity
If conventional redox flow battery designs are used, then the system structure is simplified, but scalability and adaptability for large-scale applications are limited
Solution Approach 1:
The patent employs modular redox flow battery design where the electrolyte system using organic redox-active compounds can be segmented into independent units that can be scaled and configured flexibly for different energy storage requirements without increasing overall system complexity
Solution Approach 2:
The patent enables dynamic adaptability of the battery system by using organic electrolytes with tunable properties that can be optimized for different operating conditions and scales, allowing the system to adapt from small distributed units to large-scale energy storage installations
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
The use of these organic compounds enhances the safety, reduces costs, and improves the efficiency and scalability of redox flow batteries, making them suitable for large-scale energy storage applications.
Implementation Method 1
RFBs are electrochemical systems that can repeatedly store and convert electrical energy to chemical energy and vice versa when needed. Redox reactions are employed to store energy in the form of a chemical potential in liquid electrolyte solutions
Implementation Method 2
RFBs usually include a positive electrode and a negative electrode in separated cells and separated by an ion-exchange membrane
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
The present invention relates to novel combinations of redox active compounds for use as redox flow battery electrolytes. The invention further provides kits comprising these combinations, redox flow batteries, and method using the combinations, kits and redox flow batteries of the invention.