Nondestructive Thickness Quantification for Nanoscale Coatings on Li-Ion Battery Cathode Material

Area of Science:

• Materials Science
• Electrochemistry
• Analytical Chemistry

Background:

• Nickel manganese cobalt oxide (NMC) is a key cathode material for high-energy batteries.
• Protective coatings enhance NMC cycling stability and safety.
• Accurate characterization of nanoscale coatings on NMC is challenging due to particle morphology.

Purpose of the Study:

• To develop a novel, reliable method for quantifying nanoscale protection layer thickness on NMC cathode materials.
• To address the lack of standardized techniques for coating characterization.

Main Methods:

• Utilized energy dispersive X-ray spectroscopy (EDX) at low accelerating voltage.
• Measured substrate element intensity decrease caused by overlying coating absorption.
• Employed an internal standard metal coating to account for morphology effects and improve accuracy.

Main Results:

• Successfully quantified carbon layer thicknesses ranging from 1 to 10 nm on model samples.
• Demonstrated the efficacy of the EDX-based method for nanoscale thickness evaluation.
• Validated the use of an internal standard for enhanced quantitation accuracy.

Conclusions:

• The proposed EDX method provides a viable solution for characterizing nanoscale coatings on NMC materials.
• This technique can improve the understanding and development of advanced battery cathode materials.
• Accurate coating thickness measurement is crucial for optimizing battery performance and safety.