Atomic Force Microscopy Studies on Molybdenum Disulfide Flakes as Sodium-Ion Anodes

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• 作者：Steven D. Lacey ; Jiayu Wan ; Arthur von Wald Cresce ; Selena M. Russell ; Jiaqi Dai ; Wenzhong Bao ; Kang Xu ; Liangbing Hu
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：February 11, 2015
• 年：2015
• 卷：15
• 期：2
• 页码：1018-1024
• 全文大小：354K
• ISSN：1530-6992

文摘

A microscale battery comprised of mechanically exfoliated molybdenum disulfide (MoS₂) flakes with copper connections and a sodium metal reference was created and investigated as an intercalation model using in situ atomic force microscopy in a dry room environment. While an ethylene carbonate-based electrolyte with a low vapor pressure allowed topographical observations in an open cell configuration, the planar microbattery was used to conduct in situ measurements to understand the structural changes and the concomitant solid electrolyte interphase (SEI) formation at the nanoscale. Topographical observations demonstrated permanent wrinkling behavior of MoS₂ electrodes upon sodiation at 0.4 V. SEI formation occurred quickly on both flake edges and planes at voltages before sodium intercalation. Force spectroscopy measurements provided quantitative data on the SEI thickness for MoS₂ electrodes in sodium-ion batteries for the first time.