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Understanding the Aging Mechanism of Na-Based Layered Oxide Cathodes with Different Stacking Structures
Wei-Jun Lv1, Lu Gan1, Xin-Guang Yuan1,2
1Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China.
ACS Applied Materials & Interfaces
|July 18, 2022
Summary
Layered manganese oxide cathodes for sodium-ion batteries degrade differently in air. O-type phases lose capacity due to ion extraction, while P-type phases reversibly absorb water, offering a path to improved stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Manganese-based layered oxides are promising cathodes for sodium-ion batteries.
- Their practical application is limited by sensitivity to ambient air.
- The influence of crystal structure on air-aging mechanisms requires systematic investigation.
Purpose of the Study:
- To systematically investigate the air-aging mechanisms of P-type and O-type manganese-based layered oxides.
- To understand the role of crystal structure in material degradation.
- To develop strategies for mitigating degradation and enhancing performance.
Main Methods:
- Comparative study of P-type Na0.50MnO2 and O-type Na0.85MnO2 under ambient air exposure.
- Analysis of structural and chemical changes using advanced characterization techniques.
- Electrochemical performance testing before and after air exposure and proposed treatments.
Main Results:
- O-type Na0.85MnO2 shows high affinity for moisture, leading to Na+ extraction, increased transition metal valence, interfacial resistance, and capacity loss.
- P-type Na0.50MnO2 reversibly inserts H2O into the Na layer without performance degradation; H2O can be removed by heating.
- Water insertion in P-type materials can enlarge interlayer distance, potentially beneficial for performance.
Conclusions:
- The crystal structure significantly dictates the air-aging pathway in manganese-based layered oxides.
- A washing-resintering strategy can recover performance in aged O-type materials.
- A controlled aging strategy can enhance the performance of P-type materials.
