Alumina foam-based electrolyte for thermal batteries: design and performance evaluation

Area of Science:

• Materials Science
• Electrochemistry
• Ceramics Engineering

Background:

• Thermal batteries are crucial for defense due to long shelf life and high power.
• Conventional electrolyte fabrication via cold pressing limits scalability and thin-film formats.
• Existing alternatives to cold pressing have not achieved commercial viability.

Purpose of the Study:

• To introduce a new, high-performance electrolyte for thermal batteries using molten salt-infiltrated alumina foam.
• To address the manufacturing limitations associated with traditional thermal battery electrolyte production.
• To establish alumina foam as a viable, scalable alternative for thermal battery electrolytes.

Main Methods:

• Fabrication of porous alumina foam infiltrated with molten salt.
• Characterization of ceramic foam and battery unit cells using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
• Systematic evaluation of foam's pore structure, separator thickness, and porosity effects on discharge behavior.

Main Results:

• Demonstrated molten salt-infiltrated alumina foam as a functional high-performance electrolyte for thermal batteries.
• Identified key parameters influencing discharge behavior: pore structure, separator thickness, and foam porosity.
• SEM-EDS analysis confirmed chemical compositions and microstructures of the fabricated components.

Conclusions:

• The molten salt-infiltrated alumina foam offers a scalable and structurally robust alternative to conventional pellet-pressing techniques for thermal battery electrolytes.
• This novel approach overcomes significant manufacturability limitations, enabling potential for thin and wide battery formats.
• The study presents a paradigm shift in thermal battery electrolyte fabrication, paving the way for advanced energy storage solutions.