Flow Battery Dispersion Blocker for Reactant Crossover Control
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Solution Overview
Problem
Prior flow battery systems with membraneless laminar flow architecture are unable to achieve stable closed-loop cycling and fail to control convection, limiting their efficiency and cyclability.
Innovation Solution
A membraneless flow battery design incorporating flow-through porous electrodes and a non-ion-perm-selective dispersion blocker that inhibits convective mixing while allowing molecular diffusion, with varying pore structure properties to optimize advective dispersion and conductivity, enabling cyclable energy storage without ion exchange membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a membraneless laminar flow architecture is used, then the device complexity is reduced by eliminating ion exchange membranes, but reactant crossover increases due to uncontrolled convection
Solution Approach 1:
The invention introduces a dispersion blocker as an intermediary element between the electrolyte channel and the electrode. This blocker is a porous structure that does not select ions but physically disrupts convective mixing while allowing molecular diffusion. It acts as a mediator that maintains the membraneless architecture's simplicity while preventing reactant crossover through controlled dispersion inhibition.
Solution Approach 2:
The dispersion blocker is constructed from porous material with specific pore size and structure. The porous nature allows ions to diffuse freely through the structure while the pore geometry and distribution create resistance to convective flow paths, thereby reducing reactant crossover without blocking ionic conductivity required for battery operation.
2Ease of operation
If convection is not controlled in the laminar flow channel, then the ease of operation is improved by simpler flow management, but coulombic efficiency decreases due to enhanced mixing
Solution Approach 1:
The dispersion blocker serves as a mediator element placed within the flow channel that selectively inhibits convective mixing while permitting molecular diffusion. This intermediary structure enables the system to maintain simple laminar flow operation without requiring complex flow control mechanisms, while simultaneously improving coulombic efficiency by reducing unwanted reactant mixing.
3Loss of substance
If a non-ion-perm-selective dispersion blocker is used, then the loss of substance is reduced by preventing convective mixing, but the electrical conductivity may be affected by the additional porous structure
Solution Approach 1:
The dispersion blocker utilizes porous material with optimized pore size, porosity, and tortuosity to achieve selective transport properties. The porous structure allows ionic conduction to proceed through diffusion mechanisms while the pore geometry creates sufficient resistance to convective flow paths, thereby maintaining electrical conductivity while preventing reactant mixing.
Solution Approach 2:
The invention optimizes parameters of the dispersion blocker including pore diameter, porosity, thickness, and tortuosity to balance two competing requirements: allowing sufficient ionic diffusion for electrical conductivity while creating enough flow resistance to inhibit convection. By adjusting these parameters, the system achieves reduced reactant mixing without excessive impact on electrical conductivity.
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 design achieves stable closed-loop cycling and high coulombic efficiency by minimizing reactant crossover and allowing independent tuning of flow velocities and pressures, optimizing power output and reactant utilization.
Implementation Method 1
a porous dispersion blocker disposed between the electrolyte channel and the porous cathode to inhibit convective mixing
Implementation Method 2
allowing molecular diffusion of ions and mean fluid flow to pass through it
Implementation Method 3
a porous anode for receiving a fuel and an open or porous electrolyte channel for transporting an electrolyte adjacent to the porous anode
Data Source
AI summary
The invention discloses general apparatus and methods for electrochemical energy conversion and storage via a membraneless laminar flow battery. In a preferred embodiment, the battery includes a flow-through porous anode for receiving a fuel and a porous electrolyte channel for transporting an electrolyte adjacent to the porous anode; a flow-through porous cathode is provided for transporting an oxidant; and a porous dispersion blocker is disposed between the electrolyte channel and the porous cathode, which inhibits convective mixing while allowing molecular diffusion and mean flow. Pore structure properties are selected for tuning convective dispersion, conductivity or other macroscopic properties. Specific materials, reactants, fabrication methods, and operation methods are disclosed to achieve stable charge/discharge cycles and to optimize power density and energy density.