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Achieving Long Cycle Life of Ta-Doped Manganese-Based Oxide Through Complementary Polyhedral Distortion
Jiaye Fan1,2,3, Tong Zhou2,3, Minghui Zhong2,3
1Nantong University, Nantong, China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 29, 2026
Summary
Tantalum (Ta) doping enhances sodium-ion cathode material Na0.44MnO2 by stabilizing its structure and improving sodium-ion diffusion. This leads to superior long-term cycling performance for large-scale energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Chemistry
Background:
- Sodium-ion cathode material Na0.44MnO2 shows promise for energy storage due to its stability and cost.
- Challenges include slow sodium-ion migration and Jahn-Teller distortion, limiting performance.
Purpose of the Study:
- To investigate the effect of tantalum (Ta) doping on Na0.44MnO2 cathode material.
- To enhance structural stability and improve sodium-ion diffusion kinetics.
Main Methods:
- Computational modeling to analyze the effects of Ta doping on crystal structure and polyhedral distortion.
- Electrochemical characterization to evaluate cycling stability and sodium-ion diffusion.
Main Results:
- 1% Ta doping induces complementary polyhedral distortion, enhancing structural stability.
- Ta doping weakens the Jahn-Teller effect and reduces particle size, facilitating Na+ diffusion.
- NMTO-1 (Ta-doped material) shows 98.6% capacity retention after 400 cycles at 3C and 84.53% after 3000 cycles at 20C.
Conclusions:
- Tantalum doping is an effective strategy to improve the structural stability and electrochemical performance of Na0.44MnO2 cathodes.
- This approach addresses key limitations, paving the way for high-performance sodium-ion batteries.
