Nondestructive Chemical Mapping of Lithium on/in a Graphite Electrode via X‑ray Raman Scattering Spectroscopy

Area of Science:

• Materials Science
• Electrochemistry
• Spectroscopy

Background:

• Lithium metal plating is a major challenge in lithium-ion batteries (LIBs), causing capacity fading and safety issues.
• Nondestructive characterization methods are needed to understand lithium inhomogeneity in LIBs.

Purpose of the Study:

• To demonstrate X-ray Raman scattering (XRS) spectroscopy as a novel, nondestructive technique for characterizing lithium in LIBs.
• To map the chemical state and distribution of lithium within battery electrodes.

Main Methods:

• Spatially resolved X-ray Raman scattering (XRS) spectroscopy was employed.
• A graphite electrode undergoing rapid charge-discharge cycling was analyzed.
• The technique was validated for detecting lithium within sealed battery components.

Main Results:

• XRS successfully mapped the chemical state of lithium on and inside a graphite electrode.
• Nondestructive detection of deposited lithium metal and lithium species was achieved.
• The method allowed for operando analysis of lithium behavior in LIBs.

Conclusions:

• X-ray Raman scattering (XRS) spectroscopy is a powerful new tool for characterizing lithium in LIBs.
• This technique enables deep mechanistic insights into lithium behavior, crucial for improving battery performance and safety.
• The operando compatibility of XRS facilitates real-time monitoring of lithium dynamics.