Silicene for Na-ion battery applications

Abstract
Na-ion batteries are promising candidates to replace Li-ion batteries in large scale applications because of the advantages in natural abundance and cost of Na. Silicene has potential as the anode in Li-ion batteries but so far has not received attention with respect to Na-ion batteries. In this context, freestanding silicene, a graphene-silicene-graphene heterostructure, and a graphene-silicene superlattice are investigated for possible application in Na-ion batteries, using first-principles calculations. The calculated Na capacities of 954mAh/g for freestanding silicene and 730mAh/g for the graphenesilicene superlattice (10% biaxial tensile strain) are highly competitive and potentials of >0.3 V against the Na/Na potential exceed the corresponding value of graphite. In addition, the diffusion barriers are predicted to be <0.3 eV.

Citation
Zhu J, Schwingenschlögl U (2016) Silicene for Na-ion battery applications. 2D Materials 3: 035012. Available: http://dx.doi.org/10.1088/2053-1583/3/3/035012.

Acknowledgements
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).

Publisher
IOP Publishing

Journal
2D Materials

DOI
10.1088/2053-1583/3/3/035012

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