Synthesis of the Carbon-Coated Nanoparticle Co9S8 and Its Electrochemical Performance as an Anode Material for Sodium-Ion Batteries
Synthesis of the Carbon-Coated Nanoparticle Co9S8 and Its Electrochemical Performance as an Anode Material for Sodium-Ion Batteries
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碳包覆纳米颗粒Co9S8的合成及其作为钠离子电池负极材料的电化学性能
DOI：
10.1021/acs.langmuir.6b02870
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发表时间：
2016-12-06
期刊：
影响因子：
3.9
通讯作者：
Kuang, Quan
中科院分区：
文献类型：
--
作者：
Liu, Xudong;Liu, Huatao;Kuang, Quan
以蔗糖为碳源，采用固相反应和简单的机械球磨处理制备了Co9S8/C纳米复合材料。利用x射线衍射（XRD）、x射线光电子能谱和高分辨率透射电子显微镜对Co9S8/C纳米复合材料的物相、形貌和详细结构进行了表征。作为钠离子电池的负极材料，Co9S8/C纳米复合电极在初始循环时的可逆容量约为567 mA h g(-1)，在30次循环后的可逆容量约为320 mA h g(-1)，表明其容量较大，循环性能稳定。对比了固相反应合成的Co9S8和Co9S8/C样品的电化学性能。结果表明，Co9S8具有转化型储钠机制。原位XRD和透射电镜测试表明，Co9S8的储钠机制为转化型。
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 similar to 567 mA h g(-1) in the initial cycle and maintains a reversible capacity of similar to 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 demonstrate that Co9S8 undergoes a conversion-type sodium storage mechanism. situ XRD and transmission electron microscopy tests demonstrate that Co9S8 undergoes a conversion-type sodium storage mechanism.