Quinone Flow Battery Electrolytes for High-Voltage Energy Storage
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Solution Overview
Problem
Current redox flow batteries face challenges with high costs of active materials, low cell and system performance, poor cycle life, and toxicity, limiting their widespread adoption for large-scale energy storage and integration with renewable energy sources.
Innovation Solution
Development of novel combinations of redox active quinones and hydroquinones that are highly soluble, chemically stable, and capable of high energy density, offering distinct standard reduction potentials for use as posolyte and negolyte in redox flow batteries, enhancing solubility, stability, and redox kinetics.
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 energy storage capacity is improved, but toxicity and associated health and environmental risks increase
Solution Approach 1:
The patent changes the chemical composition parameters from inorganic redox materials to organic redox materials (quinones and hydroquinones), fundamentally altering the chemical nature of the electrolyte while maintaining the redox functionality. This parameter change resolves the toxicity issue while preserving energy storage capacity.
Solution Approach 2:
The patent employs organic redox materials that are inexpensive, non-toxic, and can be readily synthesized or replaced. These materials serve as disposable or easily renewable components, eliminating the need for expensive and hazardous inorganic materials while maintaining battery functionality.
2Use of energy by moving object
If vanadium or other transition metals are used as redox materials, then redox potential and energy density are improved, but availability and costs of the redox materials increase
Solution Approach 1:
The patent replaces expensive transition metals with inexpensive organic compounds (quinones and hydroquinones) that can be synthesized from abundant, low-cost feedstocks. These organic materials are readily available and can be produced at scale without the supply chain constraints of rare earth metals.
Solution Approach 2:
The patent changes the material class from metallic inorganic compounds to organic molecular compounds, fundamentally altering the source and production method of the redox materials. This enables the use of abundant carbon-based chemistry instead of scarce metal resources.
3Reliability
If inorganic redox materials are used in redox flow batteries, then electrochemical performance is improved, but overheating, fire or explosion risks increase
Solution Approach 1:
The patent employs organic redox materials that are inherently safer and do not pose fire or explosion risks. These materials can be easily replaced if needed, and their organic nature ensures they do not present the thermal runaway hazards associated with inorganic electrolytes.
Solution Approach 2:
The patent creates a chemically stable and safe operating environment by using organic redox materials that do not support combustion or thermal runaway. This effectively creates an inert chemical environment that eliminates fire and explosion risks while maintaining electrochemical performance.
4Ease of operation
If conventional redox flow battery chemistries are used, then system operation is achieved, but round-trip efficiency and cycle life are poor
Solution Approach 1:
The patent employs a composite electrolyte system combining quinone and hydroquinone species with tailored molecular structures. This composite approach optimizes both the redox reactions and the chemical stability, achieving high round-trip efficiency and extended cycle life while maintaining ease of operation.
Solution Approach 2:
The patent optimizes multiple parameters including molecular structure, solubility, redox potential, and chemical stability of the organic redox materials. These parameter optimizations work together to achieve superior round-trip efficiency and cycle life compared to conventional systems.
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 proposed solution enables redox flow batteries to achieve high cell voltages, round-trip efficiencies greater than 80%, and extended lifetimes, addressing the limitations of existing technologies and facilitating the integration of renewable energy sources into energy storage systems.
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
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.