Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 5: Functional Materials - Battery Materials I

MM 5.2: Vortrag

Montag, 11. März 2013, 10:30–10:45, H26

First-principles study of multilayer graphynes for lithium ion battery anodes — •Hoonkyung Lee — 1Division of Quantum Phases & Devices, School of Physics, Konkuk University, Seoul 143-701, South Korea

Graphynes, two-dimensional layers of sp- and sp2-bonded carbon atoms, have recently received considerable attention because of their potential as new Dirac materials. Here, focusing on their large surface area, we explore the applicability of graphynes as lithium ion battery anodes through the first-principles density functional calculations. We have found that Li potential energies are in the range suitable to be used as anodes. Furthermore, the maximum composite of Li-intercalated multilayer α- and γ-graphynes is found to be C6Li3, which corresponds to a specific capacity of 1117 mAh g-1, twice as large as the previous theoretical prediction for graphynes. The volumetric capacity of Li-intercalated multilayer α- and γ-graphynes is 1364 and 1589 mAh cm-3, respectively. Both specific and volumetric capacities of Li-intercalated graphynes are significantly larger than the corresponding value of graphite, from which we conclude that multilayer graphynes can serve as high-capacity lithium ion battery anodes.