Researchers at McGill University have made a breakthrough in all-solid-state lithium batteries, which are seen as crucial for the future of electric vehicle technology. This new development could lead to safer and more efficient batteries for EVs by addressing a major performance issue.

The problem lies in the resistance encountered at the interface where the ceramic electrolyte meets the electrodes, adversely affecting the battery's efficiency and energy output. The research team, led by Professor George Demopoulos of the Department of Materials Engineering, has devised a solution involving a porous ceramic membrane filled with a small amount of polymer to replace the traditional dense plate used in these batteries. This innovative approach allows for the free movement of lithium ions and eliminates the interfacial resistance, facilitating a stable interface for high-voltage operations — a significant goal for the industry.

The importance of this research stems from the inherent safety risks posed by current lithium-ion batteries, which use liquid electrolytes that are flammable. All-solid-state batteries, which use solid components, aim to mitigate these risks and enhance battery efficiency. This advancement by the McGill University team represents a critical step toward realizing the potential of all-solid-state batteries for EVs, as highlighted by the study's first author and Doctor of Philosophy graduate in the Department of Materials Engineering, Senhao Wang.

This breakthrough brings the EV industry one step closer to achieving the next generation of batteries that are safer and more efficient, addressing one of the key challenges in the development of all-solid-state lithium batteries.