A Low‐Strain Cathode by sp‐Carbon Induced Conversion in Multi‐Level Structure of Graphdiyne

Abstract

AbstractA multi‐level architecture formed alternatively by the conformal graphdiyne (GDY) and CuS is well engineered for Li‐free cathode. Such a proof‐of‐concept architecture efficiently integrates the advantages of GDY and produces new functional heterojunctions (sp−C−S−Cu hybridization bond). The layer‐by‐layer 2D confinement effect successfully avoids structural collapse, the selective transport inhibits the shuttling of active components, and the interfacial sp−C−S−Cu hybridization bond significantly regulates the phase conversion reaction. Such new sp−C−S−Cu hybridization of GDY greatly improves the reaction dynamics and reversibility, and the cathode delivers an energy density of 934 Wh kg−1 and an unattenuated lifespan of 3000 cycles at 1 C. Our results indicate that the GDY‐based interface strategy will greatly promote the efficient utilization of the conversion‐type cathodes.