Liquid-Phase Approach to Glass-Microfiber-Reinforced Sulfide Solid Electrolytes for All-Solid-State Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Deformable, fast-ion conducting sulfides are key for bulk-type solid-state batteries.
• Optimizing energy density requires minimizing electrolyte layer thickness via thin membranes.
• Current methods for thin, additive-free sulfide membranes face scalability and integration challenges.

Purpose of the Study:

• To develop a scalable, solution-based method for producing reinforced sulfide solid electrolyte composites.
• To restore deformability to sulfide electrolytes for easier processing.
• To enhance the energy density and manufacturability of sulfide-based solid-state batteries.

Main Methods:

• A solution-based approach was used to create glass-microfiber-reinforced sulfide composites.
• The composites were shaped into thin membranes using cold pressing.
• The deformability and processability of the new composite material were evaluated.

Main Results:

• The proposed method yields bulk-type, deformable sulfide electrolyte composites.
• Thin membranes can be readily produced via cold pressing.
• The approach facilitates large-scale production and integration into solid cells.

Conclusions:

• Scalable production of deformable sulfide electrolytes is achievable through glass-microfiber reinforcement.
• This method simplifies the fabrication of thin membranes, boosting energy density.
• The composite approach offers a promising route for practical sulfide-based solid-state batteries.