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Constructing Mechanical-Chemical Stability via Multiphase Riveting and Interface Optimization Toward Layer-structured
Dongrun Yang1, Chen Liu2, Xuan-Wen Gao1,3
1Institute for Energy Electrochemistry and Urban Mines Metallurgy, School of Metallurgy, Northeastern University, Shenyang, Liaoning, 110819, P.R. China.
Angewandte Chemie (International Ed. in English)
|March 26, 2025
Summary
Researchers developed a novel fluorine and dislocation-rich surface for manganese-based cathode materials in sodium-ion batteries. This design enhances mechanical and chemical stability, improving battery performance and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Manganese-based layer-structured oxides are promising cathode materials for sodium-ion batteries due to cost and sodium intercalation.
- Performance is limited by mechanical/chemical instability, Jahn-Teller effect, and surface degradation.
Purpose of the Study:
- To enhance the electrochemical performance of manganese-based cathode materials.
- To address mechanical and chemical instability issues in sodium-ion batteries.
- To develop a robust multiphase structure with improved surface properties.
Main Methods:
- Employed a quenching method to create a fluorine and dislocation-rich surface.
- Fabricated a composite material: P2/P3/O3-Na0.89Ni0.3Mn0.55Cu0.1Ti0.05O1.94F0.06.
- Investigated the material's stability during (de)sodiation cycles.
Main Results:
- Achieved enhanced mechanical stability through dislocation accumulation and interlocking multiphase structures.
- Improved chemical stability via surface fluorine anchoring.
- Demonstrated impressive capacity retention: 87.17% after 200 cycles at 0.5 C and 90.4% at 1 C (1.5-4.5 V).
Conclusions:
- Simultaneous design of mechano-chemically coupled materials is crucial for high-performance cathodes.
- The developed composite shows significant potential for advanced sodium-ion battery applications.
- Surface modification strategies are effective in overcoming material limitations.
