Three-dimensional SnCu scaffold with layered porous structure enable dendrite-free anode of lithium metal batteries

Lithium metal anode with unparalleled theoretical specific capacity, ultra-low redox potential is a magic weapon to further enhance the energy density of the rechargeable batteries. Unfortunately, fragile solid electrolyte interphase, notorious dendritic growth and infinite volume expansion seriously hindered its commercialization process. Herein, a dendrite-free 3D SnCu scaffold is obtained by a simple, flexible replacement reaction. The porous SnCu with ordered layered structure can induce uniform Li deposition, suppress dendrites growth by reducing the local current density. What's more, the introduction of metal Sn enhance the lithiophilicity of Cu substrate, therefore decreasing the Li nucleation overpotential. Compared with planar Cu foil scaffold, the synthesized 3D SnCu current collector with dendrite-free morphology significantly improve the electrochemical performance of anode. The as-prepared SnCu scaffold obtains a highly Coulombic Efficiency of 94.2 % after 250 h in half-cells, and symmetrical Li@ 3D Sn/Cu cells exhibit stable cyclic for more than 1000 h at different current density (1and 5 mAh cm(-2)). (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

A dendrite-free 3D SnCu scaffold is obtained through a flexible replacement reaction. The porous SnCu with an ordered layered structure can induce uniform Li deposition, suppressing dendritic growth. The introduction of metal Sn enhances the lithiophilicity of the Cu substrate, improving the electrochemical performance of the anode.