Facet-engineered NaNbO₃ cubes with exposed (101) plane for enhanced lithium-ion storage

Area of Science:

• Materials Science
• Electrochemistry
• Computational Chemistry

Background:

• Sodium niobate (NaNbO3) is a material with potential applications in energy storage.
• Understanding ion diffusion pathways is crucial for optimizing battery electrode materials.
• Crystal facet engineering offers a route to tune material properties.

Purpose of the Study:

• To investigate the role of different crystal planes in lithium-ion diffusion in NaNbO3.
• To correlate crystal facet exposure with lithium-ion storage performance.
• To demonstrate the effectiveness of facet engineering for enhancing battery materials.

Main Methods:

• Density Functional Theory (DFT) calculations were employed to predict lithium-ion diffusion pathways.
• Experimental synthesis of NaNbO3 cubes with controlled morphology.
• Electrochemical testing to evaluate lithium-ion storage capacity.

Main Results:

• DFT predicted superior lithium-ion diffusion through the (101) plane of NaNbO3.
• Experimental NaNbO3 cubes with increased (101) plane exposure showed enhanced Li+ storage.
• This enhancement occurred despite a reduction in the overall surface area.

Conclusions:

• The (101) crystal facet of NaNbO3 plays a critical role in facilitating lithium-ion diffusion.
• Crystal facet engineering is a viable strategy for improving the electrochemical performance of NaNbO3.
• Controlling crystal morphology can significantly impact the lithium-ion storage capabilities of battery materials.