| 초록 |
Fast-charging batteries with high energy density become an essential factor for realizing the electric vehicles and large-scale energy storage systems. Aluminum (Al) has been considered a promising anode material to replace carbonaceous anodes in Li-based rechargeable batteries due to its high theoretical capacity, low operating potential, and lightweight suitable for high specific energy density. However, repeated Li insertion/extraction of Al entails large volumetric changes, thus leading to substantial hoop stress on the surface and eventual disintegration of particles. Besides, slow bulk-diffusion of a monolithic foil-type Al limits the deep diffusion of Li-ion. Here, we propose an intermetallic layer that provides an effective Li-ion transport channel and prevents structural failure. The protected electrode offers fast-charging ability while maintaining structural stability and high capacity demonstrated both in Li-ion battery and Dual-ion battery. |
