C4S Nanosheet: A Potential Anode Material for Potassium-Ion Batteries

Potassium ion batteries (KIBs) have received increasing popularity owing to their distinct advantages. We discover a hitherto unknown C4S nanosheet, novel carbon-based material with carbon and sulfur consisting of pentagons hexagons rings. The proposed nanosheet is highly stable dynamically, thermodynamically, mechanically, chemically, according first-principles calculations. Moreover, the graphene-like prospective KIBs anode material, which has metallic band structure, relatively low diffusion barrier (0.07 eV), large capacity (1340 mA h g−1), an acceptable average voltage (0.44 V). Finally, we demonstrate good cycling stability nanosheet. Our findings indicate that potentially favorable material.