Junjie Dai, Balaji Murugesan, Weidi Lin, Chao Wang, Suyuan Zhang, Jun Wu, Darwin B. Putungan, Yurong Cai
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引用次数: 0
摘要
本研究通过电纺丝技术设计并制备了多通道自支撑阳极材料 CoS/SnS@MCNFs。CoS 和 SnS 在界面上的高度相容性使材料内部合成了更完整的异质结构,通过合理的异质结构设计增强了电化学反应过程。此外,高理论容量 SnS 的加入提高了钠的存储性能。多通道碳纳米纤维(MCNF)的设计通过提供大的比表面积和实现碳封装,有效地解决了材料体积膨胀和循环过程中金属颗粒聚集等难题。由此形成的孔隙结构和异质结构,加上更多缺陷的引入,提高了电化学可逆过程中 Na 活性位点的可用性。正如预期的那样,CoS/SnS@MCNFs 在储钠方面表现出卓越的初始库仑效率(ICE = 92.6 %)和稳定的长期循环性能(400 次循环后在 2 A g 条件下为 222.5 mA h g),每个循环的衰减率仅为 0.18 %。这些研究结果表明,这种电极材料在持续大电流放电和长期耐久性能方面具有广阔的应用前景。
Construction of Co9S8/SnS heterostructures encapsulated in multi-channel carbon nanofibers as long-term stable anodes for sodium-ion batteries
This study presents the design and fabrication of multi-channel self-supported anode materials CoS/SnS@MCNFs, through the electrospinning technique. The high compatibility of CoS and SnS at the interface enables the synthesis of a more complete heterostructure within the material, enhancing the electrochemical reaction process through rational heterostructure design. Additionally, the incorporation of high theoretical capacity SnS improves sodium storage performance. The design of multi-channel carbon nanofibers (MCNFs) effectively addresses challenges such as material volume expansion and metal particle aggregation during cycling by providing large specific surface areas and enabling carbon encapsulation. The resulting pore structure and heterostructure formation, coupled with introduction of more defects, enhance the availability of Na active sites for electrochemically reversible processes. As expected, CoS/SnS@MCNFs exhibit remarkable initial coulombic efficiency (ICE = 92.6 %) and demonstrate stable long-term cycling performance (222.5 mA h g at 2 A g after 400 cycles) for sodium storage, with only a 0.18 % decay rate per cycle. These findings suggest promising application for the electrode material in sustained high-current discharges and long-endurance performance.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.