Research Webzine of the KAIST College of Engineering since 2014Fall 2023 Vol. 21
A copper current collector with increased structural dimensions and hierarchy is developed for high-performance lithium-metal battery anodes. The new surface enables inward nucleation of lithium, thus enhancing the cycle life of lithium-metal battery by 364%
A research team led by Prof. Sanha Kim in ME department has succeeded in developing an anode current collector for high-performance lithium-metal batteries using micro/nano hierarchical surface structures. As the energy demand continues to increase, the development of batteries with higher energy density and better performance is becoming more important.
Lithium-ion batteries, which are mainly used as commercial batteries, use graphite as an active anode material, which theoretically has a clear limit in energy density. Accordingly, lithium-metal batteries with high energy density that replace the anode material of existing lithium-ion batteries with lithium-metal have been attracting attention. However, in order to commercialize lithium-metal batteries, the problem of maintaining stability and performance must first be resolved. The main cause of this problem is the formation of dendrite in the form of tree branches. These are formed on the lithium-metal anode surface by heterogeneous electrodeposition of Li due to its inherent instability in organic electrolytes. The team began research on a copper current collector (Cu CC) based on a micro/nano hierarchical structure to suppress the formation of dendrites and improve the stability and performance of lithium-metal batteries.
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