Versatile Peroxide Route-Based Kinetics-Controlled Coating Method to Construct Uniform Alkali Metal-Containing Fast...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Uniform coatings of alkali metal-containing fast ionic conductors are essential for advanced battery functionalities.
• Controlling the coprecipitation of alkali and transition metal ions is a major challenge for creating homogeneous nanoshells.

Purpose of the Study:

• To develop a versatile coating approach for constructing uniform alkali metal-containing fast ionic conductor nanoshells.
• To demonstrate the efficacy of this method using lithium niobate (LiNbO3) as a model system.

Main Methods:

• A peroxide-based, kinetics-controlled coating strategy using hydrogen peroxide (H2O2) as a precipitant.
• Tuning deposition kinetics via pH adjustment to control ion coprecipitation.
• Low-temperature annealing (280 °C) to form uniform LiNbO3 nanoshells.

Main Results:

• Achieved continuous, thickness-tunable LiNbO3 coating layers with ionic conductivity two orders of magnitude higher than conventional methods.
• Demonstrated enhanced cycling and rate performance in solid-state batteries utilizing the LiNbO3 coating.
• Successfully extended the method to other alkali metal-based conductors (Li, Na, K).

Conclusions:

• The peroxide-based kinetics-controlled coating approach offers a robust solution for fabricating uniform fast ionic conductor nanoshells.
• This method significantly improves ionic conductivity, paving the way for high-performance solid-state batteries.
• The versatility of the approach broadens its applicability across various alkali metal-based battery systems.