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Phosphorus-Modulation-Triggered Surface Disorder in Titanium Dioxide Nanocrystals Enables Exceptional Sodium-Storage
Qingbing Xia1, Yang Huang2, Jin Xiao3,4
1Institute for Superconducting and Electronic Materials, University of Wollongong, Innovation Campus, North Wollongong, New South Wales, 2500, Australia.
Angewandte Chemie (International Ed. in English)
|January 25, 2019
Summary
Phosphorus modulation of titanium dioxide (TiO2) enhances sodium-ion (Na+) storage by creating surface disorder and doping. This strategy achieves near-zero strain and exceptional performance for fast, stable energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Structural modulation and surface engineering are key for efficient charge storage.
- Titanium dioxide (TiO2) is a promising material for sodium-ion (Na+) batteries.
- Improving Na+ storage kinetics and stability in TiO2 remains a challenge.
Purpose of the Study:
- To develop a phosphorus modulation strategy for TiO2 to enhance Na+ storage.
- To investigate the effects of surface disorder and atomic-level P-doping on TiO2.
- To achieve high rate capability and long-term cycling stability for Na+ storage.
Main Methods:
- A phosphorus modulation strategy was employed to modify TiO2 nanocrystals.
- Characterization of the electronic structure, surface properties, and structural stability.
- Electrochemical testing to evaluate Na+ storage kinetics, rate capability, and cycling performance.
Main Results:
- P-modulated TiO2 exhibited a favorable electronic structure and enhanced structural stability.
- Improved Na+ transfer kinetics and surface electrochemical reactivity were observed.
- Achieved genuine zero-strain characteristic (0.1% volume variation) and superior performance (210 mAh g-1 at 50 C, 5000 cycles at 30 C).
Conclusions:
- Phosphorus modulation is an effective strategy to boost Na+ storage in TiO2.
- The developed P-modulated TiO2 demonstrates excellent rate capability and long-term cycling stability.
- This approach offers a pathway for designing advanced electrode materials for sodium-ion batteries.
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