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Updated: May 29, 2025

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

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

Published on: November 11, 2013

Entropy-Tailored Fast-Charging Sodium Layered Cathodes.

Haoji Wang¹, Yu Mei^1,2, Jinqiang Gao³

¹College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

Journal of the American Chemical Society

|February 3, 2025

Summary

Entropy-tailored O3-type cathodes enhance Na-ion battery performance by optimizing structural transitions and suppressing oxygen loss. This approach improves Na-ion mobility and structural stability, leading to high rate capability and extended cycle life.

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

O3-type layered transition metal oxides are promising cathode materials for sodium-ion batteries, offering high energy density.
The structural transition between octahedral (O-type) and prismatic (P-type) phases during cycling impacts sodium-ion mobility and battery lifespan.

Purpose of the Study:

To investigate the relationship between O-P transitions, oxygen behavior, and sodium-ion kinetics in O3-type cathodes.
To develop an entropy-tailored approach to enhance structural transitions and improve battery performance.

Main Methods:

Compositionally versatile, entropy-tailored approach.
In situ high-energy synchrotron X-ray diffraction (HEXRD) to study structural transitions.
X-ray absorption spectroscopy (XAS) and theoretical analyses to confirm structural and chemical stability.

Main Results:

Promoted preferred O-P transitions with enhanced sodium-ion migration.
Mitigated irreversible oxygen loss and suppressed transition metal migration and surface reconstruction.
Achieved high rate capability (88.7 mAh g⁻¹ at 20 C) and prolonged cycle life (74.3% retention after 1000 cycles).

Conclusions:

The entropy-tailored strategy effectively enhances sodium-ion kinetics and structural stability in O3-type cathodes.
This work provides a deeper understanding of structure-property relationships for advanced layered cathode materials.
The findings broaden the prospects for fabricating high-power-density sodium-ion battery electrodes.