Porous Electrode Template Formation Without Barrier Layer Pore Widening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for forming active electrode materials on three-dimensional electrode structures in solid-state batteries face challenges such as poor mechanical stability, limited energy density, and high costs due to issues with barrier layer removal and electroplating processes, particularly in large-scale manufacturing.
Innovation Solution
A method involving anodization to form porous templates with controlled channel diameters and spacings, followed by protective treatments and etching to remove barrier layers, allowing for conformal deposition of active electrode materials like manganese oxide, while maintaining mechanical stability and reducing degradation during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the barrier layer is removed by immersing the template in H3PO4 solution, then the barrier layer is removed from channel bottoms, but excessive pore widening occurs resulting in large diameter nanowires that limit energy density
Solution Approach 1:
A protective coating is applied to the channel walls before etching the barrier layer. This preliminary action prevents the etchant from attacking the channel walls, thereby preventing pore widening while allowing complete removal of the barrier layer from channel bottoms.
Solution Approach 2:
The protective coating provides selective protection: the channel walls are coated and protected from etching, while the channel bottoms remain exposed for barrier layer removal. This local differentiation allows the etchant to act only where needed (at the bottoms) without causing unwanted side effects (pore widening).
2Manufacturing precision
If the voltage is gradually reduced during the final stage of anodization, then the barrier layer thickness is reduced to allow electroplating, but nanowires are poorly connected to the substrate through long thin root-like structures
Solution Approach 1:
The barrier layer is removed by etching after template formation, rather than attempting to control its thickness during anodization. This preliminary removal creates a clean, flat surface at the channel bottoms that provides excellent mechanical anchoring for subsequent nanowire growth, eliminating the need for thin root-like connections.
3Quantity of substance
If a three-dimensional electrode structure is used to increase surface area, then the amount of active material is increased, but conformal coating of battery materials on the three-dimensional surfaces becomes challenging
Solution Approach 1:
The barrier layer is removed in advance before electroplating the active material. This creates a uniformly exposed surface at the channel bottoms that facilitates conformal deposition of the active material throughout the three-dimensional structure, including complete coverage at the previously inaccessible channel bottoms.
4Quantity of substance
If advanced methods are used for manufacturing three-dimensional electrode structures, then the surface area is increased, but the manufacturing cost increases
Solution Approach 1:
The problematic barrier layer is selectively removed only from the channel bottoms where it is needed, rather than removing it entirely or attempting to prevent its formation. This targeted extraction approach uses simple, low-cost etching chemistry (H3PO4 or other acids) rather than expensive advanced manufacturing techniques.
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 method enables reproducible, conformal deposition of active electrode materials on a broad range of metals, enhancing mechanical stability, energy density, and reducing costs, making it suitable for large-scale manufacturing of solid-state batteries.
Implementation Method 1
A method is disclosed involving anodization to form porous templates with controlled channel diameters and spacings
Implementation Method 2
followed by protective treatments and etching to remove barrier layers
Implementation Method 3
allowing for conformal deposition of active electrode materials like manganese oxide
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Forming a layer of functional material on an electrically conductive substrate A method for forming a layer of functional material on an electrically conductive substrate is provided. This method comprises: depositing an interlayer on the substrate, depositing a functional material precursor layer on the interlayer, and activating the functional material precursor layer to thereby form the layer of functional material on the interlayer. This method may relate to the transformation of at least part of a valve metal layer into a template comprising a plurality of spaced (nano)channels, and/or to the formation of a plurality of spaced structures inside the (nano)channels of the template. The methods may further relate to the fabrication of solid-state battery cells and batteries.