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Title: Controlling Na diffusion by rational design of Si-based layered architectures
Authors: Kulish, Vadym V.
Malyi, Oleksandr I.
Ng, Man-Fai
Chen, Zhong
Manzhos, Sergei
Wu, Ping
Keywords: DRNTU::Engineering::Materials::Microelectronics and semiconductor materials
Issue Date: 2014
Source: Kulish, V. V., Malyi, O. I., Ng, M., Chen, Z., Manzhos, S. & Wu, P. (2014). Controlling Na diffusion by rational design of Si-based layered architectures. Physical Chemistry Chemical Physics.
Journal: Physical Chemistry Chemical Physics
Series/Report no.: Physical Chemistry Chemical Physics
Abstract: By means of density functional theory, we systematically investigate the insertion and diffusion of Na and Li in layered Si materials (polysilane and H-passivated silicene), in comparison with Si bulk. It is found that Na binding and mobility can be significantly facilitated in layered Si structures. In contrast to Si bulk, where Na insertion is energetically unfavorable, Na storage can be achieved in polysilane and silicene. The energy barrier for Na diffusion is reduced from 1.06 eV in the Si bulk to 0.41 eV in polysilane. The 10 improvements in storage energetics and in the activation energy for Na diffusion are attributed to the large surface area and available free volume for the large Na cation. Based on these results, we suggest that polysilane may be a promising anode material for Na-ion and Li-ion batteries with high charge/discharge rates.
ISSN: 1463-9076
DOI: 10.1039/c3cp54320j
Rights: © 2014 Royal Society of Chemistry This is the author created version of a work that has been peer reviewed and accepted for publication by Physical Chemistry Chemical Physics, Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at:
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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