Flow Battery Perylene Mediator Clogging Prevention
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Solution Overview
Problem
Current flow batteries face limitations in achieving high discharge potential and energy density due to the use of conventional redox mediators, which also lead to clogging issues and reduced cycle life from circulating powder active materials.
Innovation Solution
Incorporating perylene or its derivatives as the electrode mediator in a flow battery, allowing for the use of high potential solid cathode active materials and circulating only the liquid mediator, thereby avoiding material clogging and enhancing cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional redox mediators are used in flow batteries, then the battery can operate with liquid electrolytes, but the discharge potential and energy density are limited
Solution Approach 1:
The patent changes the chemical parameters of the redox mediator by using perylene or its derivatives instead of conventional mediators. This chemical substitution enables the system to achieve higher discharge potentials (exceeding 3.85 V) and higher energy densities, directly resolving the limitation imposed by conventional redox mediators on battery performance parameters.
2Quantity of substance
If powder active materials are circulated in the electrolyte, then the battery can achieve high capacity, but clogging occurs and cycle life is reduced
Solution Approach 1:
The patent extracts the active material from the circulating electrolyte solution, keeping it in a stationary solid form while only circulating the liquid electrolyte containing the redox mediator. This separation eliminates the clogging problem that would occur if powder active materials were circulated, thereby extending the battery's cycle life while maintaining high capacity through the stationary high-capacity active material.
Solution Approach 2:
The patent uses a redox mediator (perylene or derivative) as an intermediary substance that shuttles between the stationary active material and the electrode. This mediator enables electron transfer and charge transport without requiring the active material itself to be circulated, thus preventing clogging while maintaining high capacity and extending cycle life.
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 perylene or its derivatives as electrode mediators enables flow batteries to achieve higher discharge potentials and energy densities while preventing clogging and extending cycle life by allowing the use of high capacity powder active materials without circulating them.
Implementation Method 1
the first liquid contains perylene or the derivative thereof
Data Source
AI summary
The flow battery according to the present disclosure comprises an anode and a cathode. The cathode comprises a first electrode, a first liquid, a first active material, and a first circulation mechanism. The first liquid is in contact with the first active material and the first electrode. The first circulation mechanism is configured to circulate the first liquid between the first electrode and the first active material. The first liquid includes perylene or the derivative thereof.