Redox Flow Battery Electrolyte Flushing for Precipitate Removal
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Solution Overview
Problem
Redox flow batteries face efficiency losses due to the formation of solid precipitates at the electrodes and separator layer, which block ion exchange and reduce the capacity of the battery.
Innovation Solution
A method involving a non-battery electrolyte solution is used to remove solid precipitates by flowing through the electrodes and separator layer, either mechanically or chemically interacting with the precipitates to dissolve or carry them out of the cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If redox flow battery operates continuously, then energy storage capacity increases, but solid precipitates form on electrodes and separator layer reducing efficiency
Solution Approach 1:
The patent applies preliminary action by implementing a maintenance mode that periodically removes solid precipitates before they accumulate to levels that significantly degrade battery performance. The system switches between operational mode and maintenance mode to prevent precipitate buildup that would otherwise block ion exchange and reduce active species availability, thereby maintaining high efficiency throughout extended operation periods.
Solution Approach 2:
The patent implements periodic action by alternating between operational mode (for energy storage) and maintenance mode (for precipitate removal). This periodic switching allows the battery to accumulate energy storage capacity over time while regularly clearing precipitates that form during operation, resolving the contradiction between extended duration and maintained efficiency.
2Reliability
If solid precipitates are removed mechanically, then ion exchange pathways are cleared, but active species may be lost in the process
Solution Approach 1:
The patent uses an intermediary substance (such as a chelating agent or complexing agent) that selectively binds to solid precipitates to facilitate their removal. This intermediary allows for the dissolution and extraction of precipitates through the separator layer into the opposing electrolyte solution, enabling mechanical removal without direct abrasion that would cause active species loss. The intermediary mediates between the precipitate and the removal process, protecting active species while clearing ion exchange pathways.
3Reliability
If separator layer porosity is increased to prevent precipitate blocking, then ion exchange improves, but precipitate formation accelerates
Solution Approach 1:
The patent applies the taking out principle by actively extracting and removing solid precipitates from the electrode and separator layer through the maintenance mode operation. By periodically removing precipitates as they form, the system can maintain higher separator porosity for improved ion exchange without suffering from accumulated precipitate blocking. The extraction of precipitates prevents the feedback loop where blocked pores would otherwise accelerate local precipitate formation.
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 method effectively removes solid precipitates, enhancing the battery's efficiency and capacity by preventing blockages and maintaining ion exchange, thereby improving overall performance.
Implementation Method 1
the non-battery electrolyte solution removes solid precipitates from the cell by dissolving the solid precipitates
Implementation Method 2
the non-battery electrolyte solution includes at least one species that is chemically reactive with respect to the solid precipitates such that the reaction product of the component and the solid precipitates is soluble in the non-battery electrolyte solution
Implementation Method 3
the non-battery electrolyte solution removes the solid precipitates from the cell by carrying the solid electrolytes out of the cell
Data Source
AI summary
A method for maintaining a redox flow includes draining a first battery electrolyte solution from a redox flow battery cell, the cell including a separator layer arranged between a first electrode and a second electrode, a first circulation loop configured to provide the first battery electrolyte solution to the first electrode and a second circulation loop configured to provide a second battery electrolyte solution to the second electrode; and flowing a non-battery electrolyte solution through the first electrode. The non-battery electrolyte removes at least a portion of the solid precipitates from at least one of the first electrode and the separator layer. The method also includes draining the non-battery electrolyte solution from the cell and returning the first battery electrolyte solution to the cell. A method for a redox flow battery and a redox flow battery are also disclosed.