Tracking Lithium Ions via Widefield Fluorescence Microscopy for Battery Diagnostics

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Understanding lithium-ion transport is crucial for optimizing lithium-ion battery performance.
• Direct, real-time tracking of lithium ions is needed for in-depth mechanistic studies.

Purpose of the Study:

• To develop a fluorescent indicator for real-time, spatiotemporal tracking of lithium ions.
• To quantitatively determine lithium ion diffusion in a model battery system.

Main Methods:

• Synthesis of a novel fluorescent indicator, 2-(2-hydroxyphenyl)naphthoxazole.
• Utilizing widefield fluorescence microscopy for in situ lithium ion tracking.
• Employing a microfluidic model system for a plasticized polymer electrolyte lithium battery.

Main Results:

• Successfully synthesized and applied a visible-light-excitable fluorophore for lithium ion detection.
• Enabled quantitative determination of the lithium ion diffusion constant.
• Demonstrated the feasibility of in situ lithium ion tracking in a model battery.

Conclusions:

• The developed fluorescent indicator and microscopy technique offer a powerful diagnostic tool for lithium-ion batteries.
• This approach facilitates a deeper understanding of battery operational mechanisms.
• Real-time tracking advances the development of next-generation energy storage solutions.