Textured lithium ceramics prepared by gas-solid reactive sintering

Area of Science:

• Materials Science
• Electrochemistry
• Ceramics Engineering

Background:

• Textured ceramics offer anisotropic ionic conductivity for improved ion transport in solid-state devices.
• Current preparation methods for these advanced ceramics present significant challenges.
• Developing efficient fabrication techniques is crucial for realizing their potential.

Purpose of the Study:

• To develop a novel gas-solid reactive sintering technique for fabricating textured lithium ceramics.
• To investigate the structural and ionic conductivity properties of these textured ceramics.
• To demonstrate the broad applicability of the technique for various functional ceramics.

Main Methods:

• A gas-solid reactive sintering technique was developed and employed.
• Textured lithium ceramic electrolytes and electrodes were fabricated.
• Structural characterization focused on grain orientation and morphology.
• Ionic conductivity was measured and compared to equiaxed counterparts.
• Monte Carlo simulations and finite element analysis were used for validation.

Main Results:

• The gas-solid reactive sintering technique successfully produced textured lithium ceramics with desirable microstructures.
• Textured electrolytes exhibited large columnar grains perpendicular to the surface.
• Textured electrodes showed out-of-plane crystallographic texture.
• Ionic conductivity was enhanced by up to 42 times compared to equiaxed ceramics due to minimized grain boundary resistance.
• Experimental findings were corroborated by computational simulations.

Conclusions:

• The developed gas-solid reactive sintering technique is effective for fabricating textured ceramics with enhanced ionic conductivity.
• This method overcomes limitations of previous preparation techniques.
• The approach is versatile and can be applied to a wide range of structured and functional ceramics for advanced applications.