Korean researchers have made a significant breakthrough in extending the lifespan of lithium metal secondary batteries, which greatly enhance the energy efficiency of secondary batteries. Led by Professor Suk Jun Kim from Korea University of Technology and Education, the research team achieved this advancement by coating metal glass on surface of current collectors and lithium metal anode, marking a world-first accomplishment.

Anode-free batteries and lithium metal secondary batteries have gained attention as next-generation secondary batteries due to their higher gravimetric energy density compared to conventional lithium-ion batteries. However, the continuous exposure of lithium metal to the electrolyte and side reactions have posed challenges, resulting in shortened battery lifespans.

The research team identified metal glass, a metal alloy with a unique atomic structure, as the optimal coating material for secondary batteries. Metal glass exhibits disordered atomic arrangements similar to liquids, ensuring minimal defects, excellent surface uniformity, and exceptional resistance to corrosion. By applying metal glass coating on the current collector and lithium metal anode, the team successfully induced uniform lithium deposition during charging, minimizing contact with the electrolyte and improving overall cell performance. Moreover, metal glass acted as a protective barrier, inhibiting side reactions and significantly extending the cell's lifespan. The researchers also facilitated the uniform stripping of lithium during discharge cycles, compensating for consumed lithium.

Prof. Kim emphasized that metal glass coating suppresses reactions between lithium metal and moisture/oxygen, making it beneficial for mass production of lithium metal secondary batteries.

While the study showcased remarkable improvements in battery performance, further research is required to understand the mechanisms behind uniform lithium deposition on uniformly coated metal glass surfaces. Prof. Kim outlined plans for future research and emphasized the need for additional investigation in this area.

Enhancing Uniformity of Lithium Plating on Anodic Current Collector through Metallic Glass Thin Film Coating

[Reference] Kim et al., (2023) “Exploiting Zirconium-Based Metallic Glass Thin Films for Anode-Free Lithium-Ion Batteries and Lithium Metal Batteries With Ultra-Long Cycling Life” Small, 10.1002/smll.202301207

[Main Author] Suk Jun Kim (Korea University of Technology and Education)

* Contact email : Professor Suk Jun Kim (skim@koreatech.ac.kr)