Laser-Micromachined Ceramic Electrolyte Sheets With Defect-Free Edges
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Solution Overview
Problem
Existing methods struggle to produce thin, mechanically strong, and defect-free lithium ion electrolyte membranes with precise dimensions, particularly for unsupported membranes, due to limitations in mechanical cutting technologies and issues with grain boundary resistance, edge defects, and mechanical degradation during processing.
Innovation Solution
The formation of lithium ion electrolyte membranes involves tape casting and laser micromachining using an ablative laser to create an ablative edge, which is lithium-enriched and fine-grained, resulting in a membrane with improved mechanical strength, hermeticity, and precise dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If mechanical cutting processes are used to fabricate thin LMP membranes, then membrane thickness can be reduced to improve conductance, but manufacturing precision and mechanical strength deteriorate due to cutting limitations and edge defects
Solution Approach 1:
The patent replaces mechanical cutting processes with laser-based micromachining to fabricate thin LMP membranes. The laser process eliminates mechanical contact that causes edge defects and dimensional inaccuracies, enabling precise fabrication of membranes thinner than 200 μm while maintaining edge quality and mechanical integrity.
Solution Approach 2:
The patent changes the processing parameters by using laser micromachining instead of mechanical cutting. This parameter change allows for precise control of membrane thickness and edge quality, achieving dimensional precision that mechanical methods cannot provide while fabricating ultra-thin membranes.
2Reliability
If membrane thickness is reduced to improve conductance, then electrical conductance increases, but mechanical strength and reliability worsen due to fragility and edge defects
Solution Approach 1:
The patent replaces mechanical cutting with laser micromachining to eliminate mechanical stress and edge defects that compromise the strength of thin membranes. This substitution enables the fabrication of membranes with thicknesses below 200 μm that maintain both high conductance and adequate mechanical strength.
Solution Approach 2:
The patent applies local quality by creating a lithium-enriched fine-grained region at the membrane edges through laser processing. This localized modification enhances the mechanical strength and reliability of the edge regions, which are typically the weakest points in thin membranes, while maintaining the overall thinness required for high conductance.
3Ease of manufacture
If conventional cutting methods are used, then fabrication process is simple, but manufacturing precision and edge quality deteriorate due to microstructural defects and stress concentration
Solution Approach 1:
The patent replaces mechanical cutting with laser micromachining, which eliminates the complex setup and tooling required for precise mechanical cutting while achieving superior edge quality. The laser process directly writes the membrane geometry without mechanical contact, simplifying the fabrication process while improving precision.
4Power
If thin membranes are fabricated to achieve higher power capability, then internal resistance decreases, but manufacturing difficulty increases due to handling and processing challenges
Solution Approach 1:
The patent replaces mechanical cutting with laser micromachining, which eliminates the handling and processing challenges associated with thin membranes. The laser process can fabricate membranes thinner than 200 μm without requiring complex mechanical tooling or specialized handling procedures, thereby reducing fabrication difficulty while achieving the thinness required for high power capability.
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 process enables the production of thin, fine-grained, and defect-free electrolyte membranes with enhanced mechanical properties, such as increased strength and hermeticity, while maintaining precise dimensions and avoiding edge defects.
Implementation Method 1
cutting at least one edge of the fabricated electrolyte sheet with an ablative laser to form an ablative edge
Data Source
AI summary
Lithium-containing polycrystalline ceramic sheets include grains having an average grain size of less than 5 μm, a relative density greater than 90%, and a thickness of up to 200 μm. In aspects, the lithium-containing polycrystalline ceramic sheets include an outer edge of the sheet that has no height variations greater than 1 mm from baseline in a perimeter trace. In aspects, the lithium-containing polycrystalline ceramic sheets include microstructural features of an outer edge of the sheet are no greater than about ⅓ the thickness of the sheet. In aspects, the lithium-containing polycrystalline ceramic sheets include an outer edge of the sheet that is enriched in lithium relative to a bulk of the sheet.