Human-friendly wearable devices have been rapidly developed these days and there are strong demands for skin-like stretchability to fit the human body more closely and comfortably. In addition, it is crucial to integrate a stretchable energy storage c...
Human-friendly wearable devices have been rapidly developed these days and there are strong demands for skin-like stretchability to fit the human body more closely and comfortably. In addition, it is crucial to integrate a stretchable energy storage component with high energy density and a high voltage window into wearable devices with small dimensions for long-term usage. In this study, we introduce a hierarchically interpenetrated reentrant microcellular structure combined with two-dimensional microcellular structure of graphene-MXene-carbon nanotubes (CNTs) and three-dimensional cellular melamine foam serving as a stretchable structure for lithium metal composite electrodes to provide stretchability for lithium metal electrodes, which hold great promise as advanced energy storage systems of the future. The non-conductive and deformable melamine foam, provide stable structural deformability, while the graphene/CNT/MXene network ensures high electrical conductivity, lithiophilicity, and mechanical stability, facilitating the deposition of lithium during electrodeposition. The reentrant structure was fabricated by radially compressing the hierarchical cellular structures, leveraging the structural stretchability of the accordion-like reentrant frameworks. The resulting composite electrodes with lithium deposition exhibit significantly lower overpotential during Li stripping and plating compared to conventional lithium metal foil anodes, and they demonstrate stable electrochemical performance even under a mechanical strain of 30%. The reentrant micro-cellular electrodes exhibit significant potential in the advancement of lithium metal electrodes with a high energy density for stretchable batteries.