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Published on: November 11, 2013
Stabilizing O3-type layered oxide cathodes via dual-site co-doping for long-life sodium-ion batteries
Xuejie Bai1, Qian Yang1, Yaning Wu1
1Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology Tianjin 300401 China kaixianglei@hebut.edu.cn sjzheng@hebut.edu.cn.
This study introduces a novel cathode material for sodium-ion batteries, enhancing stability and performance. Dual-site doping effectively suppresses oxygen loss and volume changes, improving cycling life for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- O3-type layered transition metal oxides offer high theoretical capacity for sodium-ion batteries.
- Practical use is hindered by oxygen loss and volume variations during cycling.
- These issues stem from irreversible oxygen redox reactions and phase transitions.
Purpose of the Study:
- To design and synthesize a stable O3-type layered oxide cathode material.
- To address oxygen loss and volume variation challenges in sodium-ion batteries.
- To enhance the structural and cycling stability of cathode materials.
Main Methods:
- Co-doping with Sn4+/Ti4+ and Ca2+ in Na0.98Ca0.01Ni0.33Fe0.28Ti0.05Mn0.315Sn0.015O2 (CST-NFM).
- Investigating the synergistic effects of inert ion co-doping on band structure and stability.
- Electrochemical testing of the CST-NFM electrode and a full cell with hard carbon.
Main Results:
- The CST-NFM electrode demonstrated 72.69% capacity retention after 500 cycles.
- The full cell achieved an initial discharge capacity of 142.16 mAh g-1.
- The full cell maintained 86.37% capacity retention after 200 cycles.
Conclusions:
- Dual-site doping effectively suppresses oxygen release and volume fluctuations.
- The developed CST-NFM material exhibits enhanced structural and cycling stability.
- This work presents a scalable approach for high-performance layered oxide cathodes for sodium-ion batteries.
