Compared with lithium-ion batteries, all-solid-state batteries have low ionic conductivity and a small effective contact area between electrodes and electrolytes, which leads to high interfacial resistance. Gallium, which undergoes an alloying reaction with lithium, maintains a liquid phase at a wide range of temperatures, thereby relieving stress due to volume expansion, which has been a problem in conventional alloy anodes.

As such, Professor Seungho Yu aims to develop a long-life all-solid-state battery with improved electrolyte-cathode contact, which is enabled by the self-curing effect of gallium metal-based CALM anode, as well as through the uniform growth of lithium metal.

Securing sufficient effective contact area using liquid metal electrodes could lead to dramatic progress in the research and development of coin cell-type all-solid-state batteries, thereby contributing to the creation and growth of various industries.