Phenazine Electrolyte Regeneration for Redox-Flow Battery Capacity Fade
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Solution Overview
Problem
Redox-flow batteries face challenges in recycling and regenerating redox-active materials, particularly substituted phenazine compounds, due to degradation and precipitation, which affects their electrochemical performance and capacity over time, leading to increased ecological footprint and economic costs.
Innovation Solution
A process for regenerating the electrolyte solution of redox-flow batteries involving chemical or electrochemical treatment of altered soluble materials, removal and modification of precipitated materials, and separation of migrated electrolyte compounds, using oxidizing agents, filtration, and enzymatic catalysis to restore phenazine compounds and maintain their solubility and activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If redox-active materials are used in redox-flow batteries, then electrochemical energy storage capacity is improved, but degradation and precipitation occur over time leading to capacity fading
Solution Approach 1:
The patent applies the discarding and recovering principle by collecting degraded phenazine compounds that have precipitated from the electrolyte solution and regenerating them back into active redox-active materials. The process involves filtering out precipitated degradation products, treating them with oxidizing agents to restore their redox activity, and returning them to the electrolyte solution, thereby recovering the electrochemical capacity that would otherwise be lost.
Solution Approach 2:
The patent converts the harmful effect of degradation products into a beneficial outcome by using oxidizing agents to transform the degraded, inactive phenazine compounds back into active redox materials. The degradation process that normally reduces capacity is reversed through controlled oxidation, turning waste degradation products into useful redox-active substances that restore battery performance.
2Loss of substance
If conventional battery recycling methods are used, then material recovery is attempted, but the process is challenging due to difficulty in separating components and volatility of electrolytes
Solution Approach 1:
The patent applies segmentation by separating the recycling process into distinct stages: filtration of precipitated materials from the electrolyte solution, oxidation treatment of the filtered solids, and reintegration of the regenerated material. This segmented approach simplifies the overall recycling process compared to conventional methods that attempt to disassemble entire battery components, making the recovery process more manageable and efficient.
Solution Approach 2:
The patent extracts the redox-active phenazine compounds from the complex battery system by filtering them out from the electrolyte solution in their precipitated form. This extraction allows for targeted treatment and regeneration of the active material without needing to disassemble other battery components, thereby simplifying the recycling process and improving material recovery efficiency.
3Reliability
If phenazine compounds are treated with oxidizing agents, then redox activity is restored, but solubility changes may occur affecting battery performance
Solution Approach 1:
The patent applies parameter changes by carefully controlling the oxidation conditions to restore redox activity while maintaining solubility. The process involves adjusting parameters such as oxidizing agent concentration, treatment time, and temperature to achieve optimal regeneration without causing excessive solubility changes. This controlled parameter adjustment ensures that the regenerated phenazine compounds remain soluble in the electrolyte solution while regaining their electrochemical activity.
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 process effectively recovers and reactivates redox-active materials, enhancing the longevity and performance of redox-flow batteries, reducing ecological impact and economic costs by maintaining the electrochemical capacity and solubility of phenazine compounds.
Implementation Method 1
treatment of the electrolyte solution to be regenerated in order to convert organic degradation compounds contained therein to a (substituted) phenazine compound
Implementation Method 2
enzymatic catalysis to restore phenazine compounds and maintain their solubility and activity
Implementation Method 3
removal of precipitated material from the electrolyte solution
Data Source
AI summary
The present invention provides a process for the regeneration of an electrolyte solution of a redox-flow battery containing at least one (preferably substituted) phenazine compound, said process comprising at least one of the following steps (a), (b) and (c): (a) treatment of the electrolyte solution to be regenerated in order to convert organic degradation compounds contained therein to a (substituted) phenazine compound; (b) removal of precipitated material from the electrolyte solution and subsequent modification of the precipitated organic degradation compounds to obtain a (substituted) phenazine compound; and (c) separation of redox active compounds other than (substituted) phenazine compounds in particular inorganic electrolytes, from an electrolyte solution containing (substituted) phenazine compounds, and/or separation of (substituted) phenazine compounds from a solution containing redox active compounds other than (substituted) phenazine compounds.