(212b) 3D Structure SnO4 on Planar Cu Foam for Stable and Dendrite–Free Lithium Deposition

Because of the high energy density and exceedingly low reduction potential, Li-metal batteries is the promising next generation battery system. However, the application and development of Li metal battery is hindered by the uncontrollable growth of Li dendrites, which could result in the issue of short–circuit and lead to cell accident. In this study, a 3D structure SnO₄ is synthesized on the surface of the Cu foil by the hydrothermal method. Due to the large surface area and porous structure, the proposed SnO₄@Cu foam not only enhances the Li-ion diffusion and charge transfer, but also decreases the volume change of Li efficiently. Therefore, a stable Li plating/stripping process up to 200 h with a charge capacity of 1.5 mAh cm^–2 at 1.5 mA cm^−2 is realized using such a SnO₄@Cu foam current collector.