Electrode Coating Layout for Faster Electrolyte Wetting
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Solution Overview
Problem
Existing electrochemical storage cells face issues with incomplete wetting of electrodes by electrolyte, particularly in the central regions, leading to reduced performance and limited charge and discharge rates, which existing solutions complicate production or reduce energy density.
Innovation Solution
Introduce electrolyte conduction regions in the electrode coating, specifically at the outer edge, with higher diffusion rates for electrolyte, using fiber materials, porous materials, or depressions to enhance wetting without reducing energy density, by applying structured coatings or pore formers to create controlled pores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact time of the electrolyte is extended to improve wetting, then the wetting characteristics improve, but the production time and productivity deteriorate
Solution Approach 1:
The electrode coating is designed with spatially varying properties: the outer region contains hydrophilic components and/or pores that enhance electrolyte wettability, while the central region maintains standard composition for energy storage. This local differentiation enables rapid electrolyte distribution without requiring extended contact time throughout the entire electrode.
Solution Approach 2:
The hydrophilic components and pores are pre-introduced into the electrode coating during manufacturing, creating preferential pathways for electrolyte penetration before the cell is assembled and filled. This preliminary preparation eliminates the need for extended soaking times during production.
2Reliability
If pores are provided within the electrodes to improve electrolyte distribution, then the wetting characteristics improve, but the energy density deteriorates
Solution Approach 1:
Pores are introduced only in the outer region of the electrode coating, not throughout the entire electrode structure. This localized porosity provides electrolyte pathways without significantly reducing the volume available for active material in the central region, thereby maintaining high energy density.
Solution Approach 2:
The outer region incorporates porous structures with controlled pore sizes and distributions that facilitate electrolyte penetration. These pores are strategically placed only where needed for wetting, minimizing their impact on overall energy density while maximizing their benefit for electrolyte distribution.
3Reliability
If the composition of the electrolyte is varied to improve mobility, then the wetting characteristics improve, but the formulation freedom and system compatibility deteriorate
Solution Approach 1:
Instead of modifying the bulk electrolyte composition, the invention modifies the local properties of the electrode coating's outer region with hydrophilic components. This approach improves electrolyte interaction at the electrode surface without requiring changes to the overall electrolyte formulation, preserving compatibility with existing electrolyte systems.
Solution Approach 2:
Hydrophilic components are introduced as intermediary substances in the electrode coating that mediate between the electrolyte and the electrode structure. These intermediaries enhance electrolyte wettability and mobility at the interface without requiring changes to the bulk electrolyte composition, maintaining formulation freedom.
4Reliability
If the outer region of the electrode is enhanced for electrolyte conduction, then the wetting characteristics improve, but the manufacturing complexity increases
Solution Approach 1:
The electrode coating is applied with spatially varying composition: the outer region contains hydrophilic components and/or pores for enhanced wetting, while the central region uses standard composition. This can be achieved through zone-controlled application methods or by using master batches with spatially differentiated properties, adding minimal manufacturing complexity.
Solution Approach 2:
The electrode coating is effectively segmented into functional zones: an outer region optimized for electrolyte conduction and a central region optimized for energy storage. This segmentation can be implemented through controlled application processes that deposit different compositions in different zones, or through post-application treatments that selectively modify the outer region.
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
Ensures complete and uniform electrolyte wetting of the electrode, maintaining energy density and improving operational reliability and lifetime of the electrochemical storage cell.
Implementation Method 1
in the outer region has at least one electrolyte conduction region in which the diffusion rate of an electrolyte of the electrochemical storage cell is higher than in the electrode coating outside the electrolyte conduction region
Implementation Method 2
The electrolyte conduction region may be a sub-region of the outer region... The outer region in particular takes up from 10% to 40% of the area of the application zone of the conductor foil
Data Source
AI summary
Electrodes for an electrochemical storage cell, including a conductor foil including an application zone for an electrode coating, the application zone including an outer region and a central region, are provided. The outer region of the application zone lies closer to an outer edge of the conductor foil than the central region. The application zone, in the outer region, has at least one electrolyte conduction region in which the diffusion rate of an electrolyte of the electrochemical storage cell is higher than in the application zone outside the electrolyte conduction region. Electrochemical storage cells including at least one electrode are further provided. Processes for producing an electrode for an electrochemical storage cell are further provided.