Three-Dimensional Garnet Framework-Reinforced Solid Composite Electrolytes with High Lithium-Ion Conductivity and...

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Batteries

Background:

• Solid-state electrolytes are crucial for next-generation batteries.
• Garnet-based materials offer potential but face challenges in conductivity and mechanical stability.
• Developing robust frameworks is key to overcoming these limitations.

Purpose of the Study:

• To create a 3D garnet framework-reinforced solid composite electrolyte.
• To enhance ionic conductivity, thermal, mechanical, and electrochemical stabilities.
• To assess its performance in lithium-ion batteries and potential for mass production.

Main Methods:

• Fabrication of a 3D garnet framework using the polymeric sponge method with polyurethane foam as a template.
• Characterization of ionic conductivity, thermal, mechanical, and electrochemical properties.
• Testing of Li-Li symmetric cells and Li/3D garnet composite electrolyte/LiFePO4 batteries.

Main Results:

• Achieved an ionic conductivity of 1.2 × 10⁻⁴ S cm⁻¹ at 30 °C, double that of particle-reinforced composites.
• Demonstrated excellent thermal, mechanical, and electrochemical stabilities.
• Symmetric cells cycled over 360 hours, suppressing lithium dendrites.
• LiFePO4 batteries showed stable cycling performance.

Conclusions:

• The 3D garnet framework effectively reinforces the composite electrolyte and creates continuous ion transport pathways.
• The developed electrolyte exhibits superior performance and stability compared to conventional garnet composites.
• The cost-effective fabrication method makes this 3D garnet-reinforced electrolyte promising for large-scale battery manufacturing.