Crystallization-Engineered Single-Crystal T-Nb₂O₅ Whiskers with Nearly 100% Exposed Vertical (001) Facets for Li-Ion...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Optimizing lithium-ion transport kinetics in T-Nb2O5 anode electrodes is crucial for advanced battery performance.
• Tailoring crystalline structure and facet orientation are key strategies for enhancing electrode materials.

Purpose of the Study:

• To develop a crystallization engineering strategy for synthesizing T-Nb2O5 anode materials with improved Li+ transport.
• To investigate the relationship between morphology, crystal structure, and electrochemical performance of engineered T-Nb2O5.

Main Methods:

• Employed a crystallization engineering strategy to synthesize urchin-like T-Nb2O5 microspheres.
• Utilized single-crystalline whiskers with predominantly exposed (001) facets.
• Analyzed the impact of expanded interlayer spacing on Li+ diffusion pathways.

Main Results:

• Synthesized T-Nb2O5 microspheres with nearly 100% exposed vertical (001) facets, accelerating Li+ diffusion.
• Achieved a high capacity of 324 mAh g-1 at 0.05 A g-1 and improved rate performance (87.5 mAh g-1 at 5 A g-1).
• Demonstrated synergetic effects promoting rapid Li+ diffusion and enhanced electrochemical performance.

Conclusions:

• Crystallization engineering is an effective strategy for preparing fast-charging electrode materials.
• The study provides insights into the structure-property relationships governing the electrochemical performance of T-Nb2O5 anodes.