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Excellent two-dimensional electrode materials can be used to designhigh-performance alkali-metal-ion batteries. Here, we propose ReN$_2$ monolayeras a superior two-dimensional material for sodium-ion batteries. Total-energyoptimization results in a buckled tetragonal structure for ReN$_2$ monolayer,and our phonon spectrum and elastic moduli prove its dynamical and mechanicalstability. Further investigation shows that it is metallic and still keepmetallic feature after the adsorption of Na or K atoms, its lattice parameterchanges by only 3.2\% or 3.8\% after absorption of Na or K atoms. Our studyshows that its maximum capacity reaches 751 mA h/g for Na-ion batteries or 250mA h/g for K-ion batteries, and its diffusion barrier is only 0.027 eV for Naatom or 0.127 eV for K atom. The small lattice change, high storage capacity,metallic feature, and extremely low ion diffusion barriers make the ReN$_2$monolayer become superior electrode materials for Na-ion rechargeable batterieswith ultrafast charging/discharging processes.

Superior ionic and electronic properties of ReN$_2$ monolayers as Na-ion battery electrodes