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Lithium metal is considered as a promising anode for its high energy density and low redox potential. However, dendrite growth and electrolyte‐lithium reaction lead to poor cycling stability of lithium anodes. Herein, a space‐confined strategy is proposed to realize stable Li metal anode by constructing a nonplanar interface with flexible tent‐like nanocavities. The tent‐like interface is achieved through the self‐assembly of graphene oxide on zinc nanosheets, accompanied by the spontaneous formation of ZnOC bond. Remarkably, the ZnOC bond immobilizes the graphene oxide layer to ensure tent‐like structural integrity, and shows excellent lithophilicity to induce homogeneous lithium deposition within nanocavities. Furthermore, the process of Li plating/stripping is confined inside tent‐like nanocavities to effectively decrease electrolyte content contact with fresh Li, which reduces hazardous electrolyte‐lithium reaction and thus eliminates continuous consumption of Li metal. Consequently, the symmetrical cells with the tent‐like interface deliver excellent long cycling performance over 1600 h at 1 mA cm−2, and full batteries show high‐capacity retention of 94.6% after 3000 cycles at 5 C. This strategy provides a unique flexible tent‐like interface to achieve stable lithium metal anode. [ABSTRACT FROM AUTHOR]

Metallic zinc is a promising anode candidate of aqueous zinc‐ion batteries owing to its high theoretical capacity and low redox potential. However, Zn anodes usually suffer from dendrite and side reactions, which will degrade their cycle stability and reversibility. Herein, we developed an in situ spontaneously reducing/assembling strategy to assemble a ultrathin and uniform MXene layer on the surface of Zn anodes. The MXene layer endows the Zn anode with a lower Zn nucleation energy barrier and a more uniformly distributed electric field through the favorable charge redistribution effect in comparison with pure Zn. Therefore, MXene‐integrated Zn anode exhibits obviously low voltage hysteresis and excellent cycling stability with dendrite‐free behaviors, ensuring the high capacity retention and low polarization potential in zinc‐ion batteries. [ABSTRACT FROM AUTHOR]