Porous Current Density Distributor for Electrode Weight Reduction
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Solution Overview
Problem
Conventional porous electrodes and current density distributors in unipolar electrochemical arrangements face challenges with high cost, weight, and irregular power density distribution, leading to inefficient electron flow and mechanical instability.
Innovation Solution
A mesh-shaped current density distributor with reduced electrically conductive paths crosswise to the major current flow direction, incorporating electric insulators to maintain mechanical stability while increasing conductive paths along the current flow direction for enhanced current carrying capacity and homogeneous current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal mesh current density distributors are used in unipolar electrochemical arrangements, then sufficient in-plane conductivity and mechanical support are provided, but the weight and cost of the electrode increase significantly
Solution Approach 1:
The patent applies composite materials by combining conductive polymer particles (such as polyaniline, polythiophene, or polypyrrole) with porous electrode materials (such as carbon or metal foams). This composite structure provides both the required electrical conductivity and mechanical support while significantly reducing the weight compared to conventional metal mesh distributors. The conductive polymer matrix fills the pores of the porous substrate, creating a lightweight yet conductive network that maintains structural integrity.
2Stability of the object's composition
If conventional metal mesh current density distributors are used, then mechanical and dimensional stability is provided, but the cost of the electrode increases
Solution Approach 1:
The composite structure of conductive polymer particles embedded in a porous substrate provides both mechanical stability and electrical conductivity. The porous substrate (carbon or metal foam) offers structural support, while the conductive polymer network ensures adequate current distribution. This combination eliminates the need for expensive metal meshes while maintaining mechanical integrity and dimensional stability during electrode operation.
Solution Approach 2:
The patent utilizes porous materials as the base structure for the current density distributor. The porous substrate provides mechanical support while allowing the conductive polymer particles to form a distributed conductive network throughout the three-dimensional structure. This porous architecture reduces material usage and cost while maintaining structural stability and enabling effective current distribution across the electrode surface.
3Reliability
If electron current is transported over the entire electrode surface in unipolar arrangement, then current collection is achieved, but local ohmic over-potential increases and efficiency decreases
Solution Approach 1:
The patent implements local quality by creating a distributed network of conductive polymer particles throughout the porous substrate structure. This three-dimensional conductive network provides multiple local current collection pathways throughout the electrode volume, rather than relying on long-distance current transport to edge collectors. By distributing current collection sites locally throughout the electrode structure, the path length for electron transport is minimized, reducing ohmic losses and improving overall efficiency.
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
This configuration reduces material weight and cost while improving current carrying capacity and homogeneity, leading to more efficient electron transport and reaction kinetics, selectivity, and yield in electrochemical cells.
Implementation Method 1
the porous mesh has a plurality of electrically conductive paths, wherein at least part of the electrically conductive paths extend along a direction of major current flow over the current density distributor
Data Source
AI summary
The present invention relates to a mesh-shaped, porous electric current density distributor for use with an electrode, the current density distributor being adapted for providing electric current to an active layer of the electrode, which active layer is provided to contact a face of the current density distributor, wherein the current density distributor comprises a porous mesh having a plurality of electrically conductive paths, wherein at least part of the electrically conductive paths extend along a direction of major current flow over the current density distributor. The porous mesh comprises in a direction crosswise to the direction of major electric current flow, a plurality of first paths of an electric insulator. The current carrying capacity of the current density distributor in crosswise direction to the major current flow over the current density distributor is smaller than the current carrying capacity in the direction along the major current flow over the current density distributor.