Be2C5 Monolayer with Quasiplanar Pentacoordinate Carbon Atoms and Ultrahigh Energy Density as a Dirac Anode for Potassium-Ion Batteries

Abstract

Structure prediction methods and first-principles calculations are combined to propose a Dirac anode material for potassium ion batteries, namely a thermodynamically stable Be${}_{2}$C${}_{5}$ monolayer.