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Published on: November 11, 2013
Suppressing Intrinsic Anti-Site Defects via Targeted Li-Occupation Unlocks Ultrahigh-Rate Capability in Vanadium-Free
Yulun Wu1, Fangyan Liu2, Chi Zhang1
1Department of Physics and Materials, The Hong Kong Polytechnic University, Hong Kong, China.
Advanced Materials (Deerfield Beach, Fla.)
|July 26, 2026
Summary
Lithium doping in sodium-ion battery cathode Na3MnTi(PO4)3 effectively suppresses defects, enhancing electrochemical performance and enabling ultra-high rate capabilities for sustainable energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Sodium-ion batteries (SIBs) are promising for grid-scale energy storage due to abundant resources.
- NASICON-type Na3MnTi(PO4)3 (NMTP) is a vanadium-free cathode material with potential for SIBs.
- Intrinsic anti-site defects (IASDs) in NMTP hinder Mn redox kinetics, leading to voltage hysteresis and poor rate performance.
Purpose of the Study:
- To investigate the effect of targeted lithium (Li+) occupation on suppressing Mn/M2v IASDs in NMTP.
- To enhance the electrochemical kinetics and rate capability of NMTP for high-performance SIBs.
Main Methods:
- First-principles calculations to predict Li+ occupation sites and defect formation.
- Experimental synthesis of Li-doped NMTP (Na2.95Li0.05MnTi(PO4)3).
- Electrochemical characterization including charge-discharge cycling and rate capability tests.
Main Results:
- Theoretical calculations confirmed Li+ preferentially occupies alkali-metal vacancies and M2 sites, inhibiting Mn anti-site occupation.
- Experimental validation showed minimal Li doping significantly suppressed Mn/M2v IASDs in NMTP-Li0.05.
- NMTP-Li0.05 exhibited promoted kinetics, eliminated voltage hysteresis, and achieved an ultra-high rate capability of 70.2 mAh g-1 at 100 C.
Conclusions:
- Targeted Li+ doping is an effective strategy to suppress IASDs in polyanionic cathode materials like NMTP.
- Li-doped NMTP demonstrates superior electrochemical performance, paving the way for advanced sodium-ion batteries.
- This approach contributes to the development of sustainable and high-performance energy storage solutions.
