A multifunctional constrained host towards dendrite-free lithium anode

Uncontrolled growth of Li dendrites, the huge volume change of anode as well as unstable solid-electrolyte interphase (SEI) hinder the safety application of high specific energy Li metal batteries (LMBs). Herein, a synergistic strategy is introduced to address the above issues via building a multifunctional constrained host of Ag₂S/Ti₃C₂ film. Anchor the Ti₃C₂ nanosheets layers with Ag₂S nanowires (Ag₂S NWs) network to build a solid skeleton structure, which can provide sufficient void space, alleviate the collapse of the host structural during repeated Li plating/stripping. Furthermore, with the Li plating, Ag₂S can be reduced to lithiophilic Ag, inducing the uniform Li nucleation and dendritic growth suppression, and the by-product Li₂S in situ generation along the Ag₂S NWs could strengthen the SEI. Consequently, the electrode of Li-Ag₂S/Ti₃C₂ can operate stably for more than 1200 h at a current density of 0.5 mA cm^–2 in the symmetric cell cycling test. The Li-Ag₂S/Ti₃C₂||NCM811 coin cell exhibits high Coulombic efficiencies (CE) (97.94%) after 300 cycles at 1 C.