Anode-Free Aluminum Electrode with Ultralong Cycle Life and High Coulombic Efficiency Exceeding 99.92 Enabled by a Lattice-Matching Layer

摘要

Metallic aluminum is an attractive anode owing to its high specific capacity,earth abundance, and low cost. However, the poor reversibility of Aldeposition/dissolution and Al dendrites have impeded its deployment.Herein, a strategy for constructing a lattice-matching layer (LML) to regulatethe behavior of Al deposition/dissolution is demonstrated. Variousexperiments and theoretical calculations validate that gold LML as anexample can significantly enhance the nucleation density and reduce averageparticle size, which achieve highly reversible, dendrite-free, durable, andanode-free Al anodes. The metallic Al shows stable Al deposition/dissolutionon Au@Ti substrate for more than 4500 h with an average Coulombicefficiency of 99.92%, which is a record-high reported value. Furthermore, theanode-free full cell based on Au@Ti anode and expanded graphite cathodeexhibits outstanding long-term stability for 900 cycles with the capacityretention rate of 80%. This study provides an effective strategy to enhance thereversibility and utilization of the Al anode, which provides inspiration foradvanced Al batteries.