Interparticle Communication and Lithium Dynamics in Faceted Nickel-Rich NMC Cathodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Layered lithium nickel manganese cobalt oxides (NMC) are leading commercial cathode materials for lithium-ion batteries.
• Understanding lithium-ion diffusion dynamics in NMC is crucial for improving battery performance but remains challenging.
• Conventional models often oversimplify particle characteristics and interactions, limiting accurate analysis of experimental data.

Purpose of the Study:

• To investigate the anisotropic lithium-ion transport within NMC cathodes exhibiting octahedral particle morphologies.
• To elucidate the influence of interparticle communication on lithium-ion diffusion mechanisms.
• To provide a comprehensive understanding of lithium-ion transport for advancing battery material development.

Main Methods:

• Utilized charge photometry (CP) under charge-rest protocols to experimentally probe lithium-ion transport.
• Investigated transport behavior across different facets of octahedral NMC particles.
• Employed finite element simulations to corroborate experimental findings and model transport dynamics.

Main Results:

• Observed distinct anisotropic lithium-ion transport behaviors on different facets of NMC particles.
• Demonstrated the significant impact of interparticle communication, a factor often overlooked in previous studies.
• Experimental results were validated by finite element simulations, confirming the transport mechanisms.

Conclusions:

• Lithium-ion transport in NMC cathodes is anisotropic and significantly influenced by particle morphology and interparticle interactions.
• Charge photometry and computational modeling provide powerful tools for understanding complex ion diffusion in battery materials.
• This research offers critical insights for designing next-generation cathode materials with enhanced lithium-ion transport properties.