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Engineering Oxygen Vacancy Distribution for Enhanced Structural Stability in Lithium-Rich Manganese-Based Oxide
Dongye Liu1, Yin Zhao1, Linyao Dong1
1Institute of Science and Technology for New Energy, Xi'an Technological University, Xi'an 710021, China.
ACS Applied Materials & Interfaces
|February 17, 2026
Summary
Controlling the oxygen/nitrogen ratio during sintering stabilizes lithium-rich manganese-based oxides (LRMOs). This strategy enhances lattice oxygen stability, significantly improving battery performance and capacity retention for next-generation lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-rich manganese-based oxides (LRMOs) offer high specific capacities (>250 mAh g-1) for advanced lithium-ion batteries.
- Oxygen evolution during battery cycling causes structural instability and capacity fade in LRMOs.
Purpose of the Study:
- To enhance the structural stability and electrochemical performance of LRMOs.
- To reduce bulk oxygen vacancy content and improve lattice oxygen stability through controlled sintering atmospheres.
Main Methods:
- Atmosphere-controlled sintering using varying oxygen/nitrogen (O2/N2) ratios.
- Electrochemical cycling tests to evaluate capacity retention and rate capability.
- Structural characterization to analyze oxygen vacancy content and lattice stability.
Main Results:
- The O50 sample (50%O2/50%N2 sintering) retained 96.7% capacity after 300 cycles at 1 C (200 mA g-1).
- Exceptional rate capability was observed, with 155.0 mAh g-1 at 5 C and 133.2 mAh g-1 at 10 C.
- The strategy effectively reduced bulk oxygen vacancies and enhanced lattice oxygen stability.
Conclusions:
- Atmosphere-controlled sintering is a simple yet effective method for designing high-performance LRMOs.
- This approach simultaneously improves bulk oxygen stability and surface oxygen vacancy generation.
- Optimized LRMOs show significant potential for next-generation high-energy lithium-ion batteries.
Keywords:
Electrochemical performanceLattice oxygenLithium-rich manganese-based oxidesOxygen vacancySintering atmosphereMore Related Videos
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