XRF Mapping of Copper Collectors for Thin Lithium Anode Inspection
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Solution Overview
Problem
Current battery fabrication processes struggle to effectively utilize thin lithium anodes due to a lack of non-destructive, on-line characterization techniques, relying instead on destructive sampling methods that are slow and expensive.
Innovation Solution
The use of X-ray fluorescence (XRF) mappings of copper current collectors for non-contact, non-destructive, in-line quality inspections of thin lithium metal anodes, allowing for the indirect measurement of lithium metal thickness, thickness variation, and the presence of defects by analyzing the intensity of characteristic radiation from the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive sampling methods are used for lithium anode characterization, then measurement accuracy can be achieved, but production efficiency decreases and manufacturing costs increase
Solution Approach 1:
The patent replaces mechanical/chemical destructive analysis methods with X-ray fluorescence (XRF) based optical/radiation detection methods. The XRF system non-destructively characterizes lithium anodes by measuring characteristic radiation from the copper current collector, enabling in-line quality inspection without sacrificing production efficiency
Solution Approach 2:
The patent uses the copper current collector as an intermediary medium. Since lithium is transparent to X-rays, the XRF system detects characteristic radiation from the copper current collector beneath the lithium anode. This intermediary approach allows indirect measurement of lithium anode properties without direct interaction with the lithium material itself
2Reliability
If destructive sampling methods are used for lithium anode inspection, then defect detection can be achieved, but manufacturing costs increase
Solution Approach 1:
The patent replaces costly destructive sampling and analysis procedures with a non-destructive XRF-based detection system. This substitution eliminates material waste and reduces per-unit inspection costs while maintaining defect detection capability through in-line monitoring
Solution Approach 2:
The copper current collector serves as a self-identifying marker that automatically provides defect location information through its characteristic XRF signal. Areas with abnormal lithium thickness or defects allow the underlying copper structure to be detected, enabling self-diagnosis without additional complex sensing mechanisms
3Quantity of substance
If thin lithium anodes are used to increase energy density, then battery capacity improves, but characterization difficulty increases
Solution Approach 1:
The patent uses the copper current collector as an XRF-active intermediary layer beneath the X-ray transparent thin lithium anode. This allows the detection system to 'see through' the thin lithium to the copper marker, enabling characterization of ultrathin anodes that would otherwise be invisible to conventional detection methods
Solution Approach 2:
The patent changes the detection parameter from direct lithium signal detection to copper current collector signal detection. By measuring the characteristic radiation from copper rather than attempting to detect lithium directly, the system achieves high sensitivity for characterizing ultrathin lithium anodes with thicknesses optimized for maximum energy density
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 continuous, non-destructive characterization of lithium anodes, facilitating the efficient construction of next-generation, high-capacity lithium-ion batteries by ensuring consistent quality and reducing manufacturing costs.
Implementation Method 1
X-ray fluorescence (XRF) mappings of copper current collectors for non-contact in-line quality inspection of thin lithium metal anodes
Implementation Method 2
X-rays are passed through the lithium anode and into the current collector
Data Source
AI summary
Aspects of the disclosure include leveraging an X-ray fluorescence (XRF) mapping of copper current collectors for non-contact, non-destructive, in-line quality inspections of thin lithium metal anodes. An exemplary method can include receiving an electrode at a detection surface of the XRF detector. The electrode can include the lithium anode on a surface of a current collector. X-rays are passed through the lithium anode and into the current collector and the intensity of characteristic radiation returning from the current collector is measured at the XRF detector. A lithium anode characteristic can be inferred based on the measured intensity of characteristic radiation from the current collector.