Operando Raman spectroscopy for investigating lithium deposition/dissolution and diffusion at the microelectrode surface
Hayate Mukofukasawa, Koji Hiraoka, Shiro Seki
TL;DR
This paper introduces a new Raman spectroscopy method to study lithium behavior at microelectrodes in lithium-ion batteries.
Contribution
The novel operando Raman spectroscopy method enables real-time visualization of lithium deposition and dissolution processes at microelectrode interfaces.
Findings
Lithium deposition releases free EC and FSA molecules at the interface.
Dissolution promotes rapid Li+ coordination.
The observed diffusion layer thickness aligns with theoretical predictions.
Abstract
We developed an operando Raman spectroscopy method to visualize lithium deposition and diffusion at the microelectrode interface. Lithium deposition released free EC and FSA, while dissolution promoted rapid Li+ coordination. The estimated diffusion layer thickness matched theoretical predictions, highlighting micro-Raman spectroscopy's potential for studying lithium-ion battery interfaces. Operando Raman spectroscopy was developed to visualize interfacial reactions at a microelectrode, revealing environmental changes during Li deposition/dissolution and enabling analysis of dynamic battery interface processes.
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Taxonomy
TopicsAdvancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research