Welcome to Journal of University of Chinese Academy of Sciences,Today is

›› 2018, Vol. 35 ›› Issue (6): 735-742.DOI: 10.7523/j.issn.2095-6134.2018.06.004

Previous Articles     Next Articles

Adsorption and migration of Li-ion in layered SnSe2: a first principle study

FANG Lincan1, HAO Kuanrong1, YAN Qingbo1, ZHENG Qingrong2   

  1. 1 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
    2 School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-09-27 Revised:2017-11-15 Online:2018-11-15
  • Supported by:
    Supported by National Basic Research Program (2012CB932900)

Abstract: The properties of Li-ion adsorption and migration in layered SnSe2 are systematically investigated using the first principle calculations. It is found that the Li atoms are adsorbed strongly on substrate SnSe2, and the binding energy (>3eV) is significantly higher than those on graphene, phosphorene, MoS2, and some other two-dimensional (2D) layered materials. Bader charge analysis reveals that almost the whole charge of 2s electron of the Li atom transfers to substrate SnSe2 and Li exists in the cationic state. The Li-ion migration energy barrier for monolayer SnSe2 is 0.197eV, which is significantly lower than those for graphene, MoS2, and other 2D materials. The average open-circuit voltage of 3.05V is predicted in the monolayer SnSe2-based Li-ion battery. The Li intercalation also leads to a transition from semiconductor to metallic state and gives rise to a good electrical conductivity. These findings provide insights into the Li-ion adsorption properties and migration mechanism in layered transition-metal dichalcogenide.

Key words: SnSe2, Li-ion adsorption, Li-ion migration, first principle calculation

CLC Number: