由Co/Ni配合物先驱体制备超长循环寿命的NiCo2O4/C & S超级电容器复合物电极材料
An Extra-Long-Life Supercapacitor Based on NiCo2O4/C & S Composite by Decomposition of Co/Ni-Based Coordination Complex
DOI: 10.12677/MS.2018.85051, PDF,    国家自然科学基金支持
作者: 涂佩华, 祝精燕, 李新华：温州大学化学与材料工程学院，浙江 温州
关键词: 金属氧化物；超级电容器电极材料；复合物；配合物；先驱体；Metal Oxides； Supercapacitor； Composite； Coordination Complex； Precursor
摘要: 单一电极材料很难满足高性能超级电容器的需求。为开发兼具氧化物和碳材料优点的电极材料，本文通过在400℃下氧Co/Ni混合配合物先驱体，得到一种堆积紧密的NiCo2O4/C & S纳米复合材料。应用多种检测手段，如粉末衍射、扫描电镜、透射电镜和元素分析等，对该复合物的结构特征和组成进行了表征。同时，利用循环伏安、恒流冲放电和阻抗分析等技术对该复合材料的电化学性质进行了分析。结果表明，该复合材料是由NiCo2O4纳米颗粒和未完全碳化、硫化的微量C和S均匀复合而成。当用于超级电容器电极材料时，该复合物展示出超长的冲/放电稳定性(>20,000圈)。该复合物循环寿命的提高，得益于它的超高稳定性。本文探讨了掺杂的C和S对形成这种稳定结构的作用。实验结果显示，NiCo2O4/C & S复合材料对开发实用型超级电容器电极材料具有重要参考价值。
Abstract: Single-material electrodes do not satisfy the demands of high-performance supercapacitors. To exploit the advantages of both oxides and carbon-based materials, a tightly packed NiCo2O4/C & S nanocomposite is fabricated by sintering a Co/Ni-based coordination complex precursor at 400˚C. The composites and basic components are characterized using various techniques, namely, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and elemental analysis. The electrochemical performance is analyzed by cyclic voltammetry, galvanostatic charge/discharge cycling, and electrochemical impedance spectrometry. A uniform nanocomposite was found to be formed of NiCo2O4 nanoparticles, incompletely carbonized C, and incompletely vulcanized S. When used as supercapacitor electrodes, the synthesized composites show extra-long cycling stability (>20,000 cycles) during the charge/discharge process. This improvement in the cycle life of the composites is attributed to its highly stable structure. The roles of C and S in forming a stable structure are investigated. The results show that a supercapacitor with electrodes made from the as-prepared NiCo2O4/C & S composite will be promising for commercial applications.
文章引用：涂佩华, 祝精燕, 李新华. 由Co/Ni配合物先驱体制备超长循环寿命的NiCo2O4/C & S超级电容器复合物电极材料[J]. 材料科学, 2018, 8(5): 455-462. https://doi.org/10.12677/MS.2018.85051

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