Researchers at DGIST have developed an advanced lithium metal battery featuring a triple-layer solid polymer electrolyte, enhancing safety, efficiency, and durability for applications in electric vehicles (EVs) and energy storage systems. Led by Principal Researcher Kim Jae-hyun, the team addressed dendrite formation—tree-like lithium structures that compromise battery performance and pose fire risks—by designing an innovative electrolyte structure.
The triple-layer electrolyte consists of materials that contribute to fire resistance, structural strength, and efficient lithium ion movement. The middle layer enhances mechanical strength, while the soft outer layer ensures optimal electrode contact, facilitating rapid lithium ion transfer and reducing dendrite formation. Experimental results show the battery retains 87.9% of its performance after 1,000 charging cycles, outperforming traditional batteries which typically retain only 70-80%. Additionally, the new design can extinguish itself in the event of a fire, significantly improving safety.
This technology holds promise for use in a variety of devices, including smartphones, wearables, and large-scale energy storage. Dr. Kim emphasized its potential contribution to the commercialization of safer and more efficient lithium metal batteries. This research was supported by projects from the National Research Foundation of Korea and other institutions.
