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Updated: Jul 31, 2025
10:03
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.5K
Stacking Order Induced Anion Redox Regulation for Layer-Structured Na0.75 Li0.2 Mn0.7 Cu0.1 O2 Cathode Materials
Cui Ma1, Aierxiding Abulikemu2, Jian Bao1
1Department of Materials Science, Fudan University, Shanghai, 200438, China.
Small (Weinheim an Der Bergstrasse, Germany)
|May 4, 2023
Summary
The P3 stacking order in layered cathode materials enhances oxygen redox reversibility and structural stability for sodium-ion batteries (SIBs), leading to improved electrochemical performance.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Layer-structured cathode materials are crucial for sodium-ion batteries (SIBs).
- Stacking order significantly influences electrochemical behavior and structural stability.
- The specific impact of stacking order on anionic redox remains largely uninvestigated.
Purpose of the Study:
- To compare the electrochemical and structural properties of two layered cathodes with different stacking orders: P2-Na0.75Li0.2Mn0.7Cu0.1O2 (P2-LMC) and P3-Na0.75Li0.2Mn0.7Cu0.1O2 (P3-LMC).
- To elucidate the role of stacking order in anionic redox mechanisms within these materials.
- To provide insights into designing advanced cathode materials for SIBs.
Main Methods:
- Synthesis and characterization of P2-LMC and P3-LMC materials.
- Synchrotron hard and soft X-ray absorption spectroscopies to analyze redox couples.
- In situ X-ray diffraction to study structural evolution during cycling.
- Electrochemical testing (capacity, retention, rate capability).
Main Results:
- P3 stacking order demonstrates superior oxygen redox reversibility compared to the P2 stacking order.
- P3-LMC exhibits simultaneous contributions from Cu2+/Cu3+, Mn3.5+/Mn4+, and O2-/O- redox couples.
- Enhanced electronic densities in Cu 3d and O 2p orbitals in P3-LMC contribute to more reversible redox reactions.
- P3-LMC shows higher structural reversibility during charge/discharge, even at a 5C rate.
- P3-LMC achieves a high reversible capacity of 190.3 mAh g-1 and capacity retention of 125.7 mAh g-1 over 100 cycles.
Conclusions:
- The P3 stacking order is beneficial for improving oxygen redox reversibility in layered cathode materials for SIBs.
- Understanding the influence of stacking order on anionic redox provides critical insights for developing high-performance SIB cathodes.
- P3-LMC represents a promising cathode material for advanced sodium-ion battery applications.
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