Synthesis of the Carbon-Coated Nanoparticle Co9S8 and Its Electrochemical Performance as an Anode Material for Sodium-Ion Batteries

详细信息    查看全文

• 作者：Xudong Liu ; Huatao Liu ; Yanming Zhao ; Youzhong Dong ; Qinghua Fan ; Quan Kuang
• 刊名：Langmuir
• 出版年：2016
• 出版时间：December 6, 2016
• 年：2016
• 卷：32
• 期：48
• 页码：12593-12602
• 全文大小：862K
• ISSN：1520-5827

文摘

A Co₉S₈/C nanocomposite is prepared using a solid-state reaction followed by a facile mechanical ball-milling treatment, with sucrose as the carbon source. The phases, morphologies, and detailed structures of the Co₉S₈/C nanocomposite are well-characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. When evaluated as an anode material for sodium-ion batteries, the Co₉S₈/C nanocomposite electrode displays a reversible capacity of ∼567 mA h g^–1 in the initial cycle and maintains a reversible capacity of ∼320 mA h g^–1 after 30 cycles, indicating a larger capacity and a stable cycling performance. For comparison, the electrochemical performances of Co₉S₈ and Co₉S₈/C samples synthesized using the solid-state reaction are also displayed. The ex situ XRD and transmission electron microscopy tests demonstrate that Co₉S₈ undergoes a conversion-type sodium storage mechanism.