| 室温固相反应助力制备氮硫共掺杂碳限域的FeCoS2复合物用于高性能钠离子电池负极 |
| Room-temperature solid-state reaction-assisted strategy to fabricate nanocomposites of N, S-codoped carbon confined FeCoS2 as high-performance anode materials for sodium-ion batteries |
| 作者 | 单位 | E-mail | | 马文龙 | 南京师范大学化学与材料科学学院, 江苏省新型动力电池重点实验室, 南京 210023 | | | 刘桑鑫 | 南京师范大学化学与材料科学学院, 江苏省新型动力电池重点实验室, 南京 210023 | | | 周钺 | 南京晓庄学院环境科学学院, 南京 211171 | zhouyue@njxzc.edu.cn | | 吴平 | 南京师范大学化学与材料科学学院, 江苏省新型动力电池重点实验室, 南京 210023 | | | 曹鑫 | 南京师范大学化学与材料科学学院, 江苏省新型动力电池重点实验室, 南京 210023 | | | 朱晓舒 | 南京师范大学分析测试中心, 南京 210023 | | | 魏少华 | 南京师范大学化学与材料科学学院, 江苏省新型动力电池重点实验室, 南京 210023 | | | 周益明 | 南京师范大学化学与材料科学学院, 江苏省新型动力电池重点实验室, 南京 210023 | zhouyiming@njnu.edu.cn |
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| 摘要: 利用室温固相自组装反应制备Co (Ⅱ)和Fe (Ⅱ)双席夫碱配合物，随后在硫粉存在下中温热处理，使该配合物同时发生热解碳化和固相硫化反应，从而获得N、S共掺杂碳限域的FeCoS2纳米复合物(记为FeCoS2⊂NSC)。通过粉末X射线衍射、透射电镜、X射线光电子能谱和热重分析技术分别对纳米复合物的物相、形貌结构、组分和含量等进行物理表征，并通过循环伏安、恒电流充放电技术测试其电化学储钠性能。研究结果表明，最优化条件下制备的复合物(FeCoS2⊂NSC-7001)中FeCoS2粒子的平均尺寸约为3.4 nm，且被均匀限域在N、S共掺杂的碳基体中；该复合物作为钠离子电池负极时，在0.1 A·g-1的电流密度下经过300次充放电循环，其可逆充电比容量仍高达310.4 mAh·g-1；即使在5 A·g-1的大电流密度下，其充电比容量也高达146.0 mAh·g-1，呈现优异的电化学储钠性能。 |
| 关键词: 钠离子电池 负极材料 FeCoS2纳米晶 N、S共掺杂碳材料 纳米复合物 室温固相反应 |
| 基金项目: 国家自然科学基金(No.22004070，52072181)资助。 |
| Abstract: In this work, a facile and cost-effective solid-state reaction method for the synthesis of the nanocomposites (denoted as FeCoS2⊂NSC) of N, S-codoped carbon-confined FeCoS2 nanocrystalline was presented. By directly mixing cobalt acetate tetrahydrate, ferrous acetate, o-vanillin and o-phenylenediamine with a molar ratio of 1∶1∶4∶2 at ambient temperature in the presence of sulfur powder, a self-assembly solid state reaction took place to give rise to the complexes of Co(Ⅱ) and Fe(Ⅱ) with a bis-Schiff base, which were evenly distributed in the sulfur powder surroundings. After subsequent annealing at an elevated temperature, simultaneous carbonization and sulfidization occurred, resulting in the in-situ formation of ultrafine FeCoS2 nanoparticles confined in N, S-codoped carbon matrices. The phase, morphology, composition, and content of each component in the nanocomposite were determined by powder X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The electrochemical sodium storage performance was tested by the cyclic voltammetry and galvanostatic charge-discharge techniques. The results showed that the average size of the FeCoS2 particles in the optimized nanocomposite (FeCoS2 ⊂ NSC-7001) was ca. 3.4 nm, which was uniformly confined in the N, S-codoped carbon matrices. When FeCoS2⊂NSC-7001 was used as an anode material for sodium-ion batteries, it exhibited excellent electrochemical energy storage performance in terms of long-term cycling stability and rate capability. An anode prepared with FeCoS2 ⊂ NSC-7001 nanocomposite exhibited significantly improved sodium-ion storage performance, where a large reversible charging capacity of 310.4 mAh·g-1 was obtained after 300 cycles at a current density of 0.1 A·g-1. Even when such an anode was cycled at a current density of 5 A·g-1, a reversible specific charging capacity of 146.0 mAh·g-1 can still be achieved, showing excellent electrochemical sodium storage performance. |
| Keywords: sodium-ion batteries anode materials FeCoS2 nanocrystalline N, S-codoped carbon material nanocomposites room-temperature solid-state reaction |
| 投稿时间：2023-10-19 修订日期：2023-12-20 |
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| 马文龙,刘桑鑫,周钺,吴平,曹鑫,朱晓舒,魏少华,周益明.室温固相反应助力制备氮硫共掺杂碳限域的FeCoS2复合物用于高性能钠离子电池负极[J].无机化学学报,2024,40(1):145-154. |
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