Promising application of a SiC2/C3B heterostructure as a new platform for lithium-ion batteries

Abstract

Constructing heterostructures via the van der Waals coupling effect has provided an effective method for developing novel electrode materials. In this work, based on the first-principles calculation method, we proposed to construct a hexagonal SiC₂/C₃B heterostructure and confirmed its stability by analyzing its structural properties. Meanwhile, the electrochemical performances of the SiC₂/C₃B heterostructure as a new platform for lithium-ion batteries were evaluated. The calculated results illustrate that the pristine SiC₂/C₃B heterostructure is a semiconductor with a small bandgap of 0.15 eV and the lithiated heterostructure exhibits metallic properties which ensure superior electrical conductivity for fast electron transfer. Moreover, the low diffusion barriers of the heterostructure are acceptable to guarantee a high-rate performance for the batteries. Compared with the anode properties of isolated SiC₂ and C₃B monolayers, an enhancement of the storage capacity of Li ions on the SiC₂/C₃B heterostructure is observed, which could reach up to 1489.72 mA h g⁻¹. In addition, the ab initio molecular dynamics simulations reveal that the SiC₂/C₃B heterostructure could maintain excellent structural stability during the lithiation processes even at a temperature of 350 K. All these encouraging results show that the SiC₂/C₃B heterostructure has fascinating potential to be an advanced platform for lithium-ion batteries.