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Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Structural Regulation Enables High Interfacial Functionality for Ni-Rich Single-Crystalline Cathodes.

Pei Liu¹, Haoran Wei¹, Tao Huang²

¹Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.

ACS Applied Materials & Interfaces

|September 24, 2024

Summary

Yttrium modification stabilizes Ni-rich single-crystalline cathodes (SC-NMC83) by preventing cracks and improving lithium-ion diffusion. This enhances battery performance, offering a promising strategy for advanced energy storage solutions like all-solid-state batteries.

Keywords:

Ni-rich cathode engineering CEI low migration energy barrier structural stability yttrium modification

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Ni-rich single-crystalline layered cathodes offer high energy density but suffer from capacity degradation.
Lattice strain and interfacial side reactions are key challenges in their practical application.

Purpose of the Study:

To stabilize the structure of Ni-rich single-crystalline LiNi0.83Mn0.05Co0.12O2 (SC-NMC83) using yttrium modification.
To mitigate capacity degradation and improve the electrochemical performance of these cathode materials.

Main Methods:

Employed an effective yttrium modification method on SC-NMC83.
Investigated the structural stabilization and ion diffusion properties of the modified material.

Main Results:

Yttrium modification successfully immobilized oxygen, preventing crack formation in SC-NMC83.
The yttrium-modified sample (SC-NMC83-Y) showed significantly improved capacity retention (90% after 100 cycles) compared to the unmodified sample (76.1%).
Broadened the diffusion path for Li+ ions, enhancing overall performance.

Conclusions:

Yttrium doping is a promising strategy for enhancing the stability and performance of Ni-rich single-crystalline cathodes.
This approach paves the way for practical applications, including in all-solid-state batteries.