Monolayer, bilayer, and bulk BSi are studied to explore their application potential as anode materials of Li-ion batteries. Structural stability and metallicity are obtained in each case. The Li storage capacities of monolayer and bilayer BSi are 1378 and 689 mAh/g, respectively, with average open circuit voltages of 1.30 and 0.47 V as well as Li diffusion barriers of 0.48 and 0.27 eV. Bulk BSi realizes a layered structure in the presence of a small amount of Li and its Li diffusion barrier of 0.48 eV is identical to that of graphite and lower than that of bulk Si (0.58 eV). The Li storage capacity of bulk BSi is found to be 689 mAh/g, i.e., much higher than that of graphite (372 mAh/g). The volume expansion turns out to be 33% and the chemical bonds remain intact at full lithiation, outperforming the 72% volume expansion of bulk Si at the same capacity and thus pointing to excellent cyclability.
Bibliographical noteKAUST Repository Item: Exported on 2022-03-17
Acknowledgements: This work was supported by the fund of the Guangdong Provincial Key Laboratory of Computational Science and Material Design (No. 2019B030301001) and by the Introduced Innovative R&D Team of Guangdong (2017ZT07C062). The calculations were supported by the Center for Computational Science and Engineering of Southern University of Science and Technology. The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry