Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 779, Issue -, Pages 813-820Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.11.352
Keywords
Molybdenum disilicides; Electrochemical performance; Volume expansion; Electric conductivity
Categories
Funding
- National Natural Science Foundation of China [51564025]
- State Key Laboratory of Advanced Technology for Comprehensive Utilization of Platinum Metals [SKL-SPM-201816]
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Although Si is a promising anode material, the worse electric conductivity and volume expansion of Si are key bottlenecks. To solve these problems, we apply the ab initio calculations to explore the structural feature, electrochemical and electronic properties of MoSi2. Two novel MoSi2 orthorhombic phases: TiSi2-type(Fmmm) and ZrSn2-type(Fddd) are predicted. MoSi2 markedly improves the elastic stiffness and volume deformation resistance of Si due to the formation of Mo-Si bond. The calculated volume of MoSi2 is smaller than that of Si. Importantly, the calculated average open circuit voltage(V-oc) of hexagonal(P6(2)22), tetragonal(14/mmm), orthorhombic(Fmmm) and orthorhombic(Fddd) structures is 2.87 V, 1.23 V, 1.25 V and 2.47 V, respectively. The reason is that the introduction of Mo improves the charge overlap between the conduction band and the valence band. The tetragonal and orthorhombic structures exhibit metallic behavior due to the localized hybridization between Mo-d state and Si-p state. Our work provides a new path to improve the electrochemical and electronic properties of Si. (C) 2018 Elsevier B.V. All rights reserved.
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