An All-Solid-State Coaxial Structural Battery Using Sodium-Based Electrolyte.

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• The transition to a sustainable society necessitates widespread electrification, including vehicles, grids, and electronics.
• Current energy storage solutions often face limitations in terms of safety, energy density, and structural integration.
• There is a need for advanced materials that can combine energy storage capabilities with structural integrity.

Purpose of the Study:

• To develop an all-solid-state structural battery with integrated energy harvesting and storage functionalities.
• To optimize volume utilization in hollow structures by incorporating an electrochemical system.
• To enhance both energy storage performance and mechanical properties of structural components.

Main Methods:

• Fabrication of a coaxial multifunctional beam using a Na⁺-based ferroelectric glass electrolyte and metallic electrodes.
• Integration of thin-ply carbon-fiber laminates to form a coaxial cell structure.
• Electrochemical cycling and mechanical testing to evaluate performance and durability.

Main Results:

• Demonstrated electrochemical performance with three-minute charges and long-duration discharges (70 cycles).
• Achieved an energy density of 56.2 Wh·L^-1 and specific energy of 38.0 Wh·kg^-1, the highest for safe structural cells.
• Mechanical tests confirmed the cell's ability to withstand severe deformation without functional compromise, enhancing structural strength.

Conclusions:

• The developed Na⁺-based structural battery offers a safe and efficient alternative to traditional lithium-ion batteries.
• Its multifunctional nature, combining energy storage and structural support, is ideal for applications requiring optimized volume and weight.
• The absence of alkali metals and liquid electrolytes enhances safety and thermal properties, making it suitable for diverse applications.