Nanoengineering of Li2MnO3 Domain Stabilizes Li-Rich Layered Oxides
Wukun Xiao1, Chuan Gao1, Tie Luo1
1Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, School of Materials Science and Engineering, Peking University, Beijing 100871, People's Republic of China.
ACS Nano
|September 17, 2025
Summary
Engineered twin boundaries in lithium-rich manganese oxide cathodes enhance battery performance by improving ion diffusion and structural stability. This strategy advances high-energy-density lithium-ion battery development.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Lithium-rich manganese-based layered oxides (LMOs) offer high energy density for lithium-ion batteries due to oxygen anion redox.
- Challenges include poor rate capability, capacity fading, and voltage decay from structural degradation and oxygen evolution.
Purpose of the Study:
- To introduce a nanoarchitecture engineering strategy using twin boundaries to improve Li2MnO3 domain configuration in LMO cathodes.
- To enhance electrochemical performance and structural stability of lithium-rich cathode materials.
Main Methods:
- Atomic-resolution scanning transmission electron microscopy
- Synchrotron-based X-ray spectroscopy
- Density functional theory calculations
Main Results:
- Engineered twin boundaries create conductive networks and improve lithium-ion diffusion.
- Controlled Li2MnO3 domain size (<5 nm) and preserved cation ordering.
- Enhanced reversibility of anionic redox reactions and improved structural stability during cycling.
Conclusions:
- Twin boundary formation is an effective strategy for domain engineering in oxygen redox-active materials.
- This nanostructure design paradigm advances high-performance lithium-rich cathode materials for next-generation batteries.
