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Published on: November 11, 2013
Tailoring Surface Chemistry for Robust and Ambient-Stable Sodium Layered Oxide Cathodes
Xiaoshi Hu1, Xinyu Ma1, Yuhang Jin1
1New Energy Materials Research Center, Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|May 25, 2026
Summary
A novel Nb-Ti surface modification enhances sodium-ion battery cathodes by creating a protective layer. This improves stability and performance for sustainable energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Layered transition metal oxides are key cathode materials for sodium-ion batteries (SIBs).
- Interfacial instability hinders the practical application of these SIB cathodes.
- Degradation pathways include irreversible lattice oxygen redox and transition metal dissolution.
Purpose of the Study:
- To develop a synergistic Nb-Ti surface modification strategy for layered oxide cathodes.
- To construct a multifunctional surface on Na2/3Mn2/3Cu1/3O2 (NMCO) to improve stability.
- To investigate the protective mechanisms of the modified surface layer.
Main Methods:
- Synergistic Nb-Ti surface modification of NMCO cathode material.
- Multimodal characterizations to analyze surface structure and composition.
- Theoretical calculations to understand degradation mechanisms and modification effects.
Main Results:
- An in situ constructed Nb-Ti surface layer acts as a defense barrier.
- The modification suppresses irreversible lattice oxygen redox and transition metal dissolution.
- Enhanced structural integrity and Na-ion diffusion kinetics were observed, leading to exceptional cycling stability and ambient robustness.
Conclusions:
- The Nb-Ti surface modification strategy effectively enhances the performance of layered oxide cathodes for SIBs.
- The multifunctional surface layer reinforces structural integrity and improves ion transport.
- This approach offers a promising pathway for developing high-performance and sustainable energy storage solutions.
