I. Shepa, E. Múdra, D. Capková, A. Kovalčíková, Ondrej Petrus, Frantisek Kromka, O. Milkovič, V. Antal, M. Baláž, M. Lisnichuk, Dominika Marcin-Behunova, D. Zalka, Ján Dusza
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引用次数: 0
摘要
这篇论文介绍了 Nb2O5 纳米纤维的制备及其详细表征,以及它们在锂硫电池中的应用,以改善电化学性能。利用无针反应电纺丝技术,我们只需一步就能获得无定形的预陶瓷复合 PAN/Nb2O5 纤维,并通过煅烧将其转化为多孔陶瓷 Nb2O5 纳米纤维。热重研究表明,在 600 °C 下煅烧可产生无碳残留的结晶陶瓷纤维。通过扫描和透射电子显微镜分析了陶瓷纳米纤维的纤维形态和平均直径(614 ± 100 nm)。通过氮吸附测量确定了 7.472 m2/g 的表面积,同时结合 X 射线衍射和拉曼光谱显示了煅烧后纤维的结晶度和成分--单 T 相 Nb2O5。通过电化学测试确定了其在锂硫电池阴极中的性能,并将所得结果与类似的空白电极进行了比较。0.5 C 的初始放电容量达到了 570 mAh∙g-1 的值,而经过 200 次循环后,可逆容量仍为 406 mAh∙g-1 ,容量保持率为 71.3%。碳阴极中 Nb2O5 纳米纤维的存在通过多硫化物的封闭抑制了穿梭效应,这种效应源于多孔性和化学捕获。
Porous Nb2O5 Nanofibers Prepared via Reactive Needle-Less Electrospinning for Application in Lithium–Sulfur Batteries
This contribution describes the preparation, coupled with detailed characterization, of Nb2O5 nanofibers and their application in lithium–sulfur batteries for the improvement of electrochemical performance. The utilization of reactive needle-less electrospinning allowed us to obtain, in a single step, amorphous pre-ceramic composite PAN/Nb2O5 fibers, which were transformed into porous ceramic Nb2O5 nanofibers via calcination. Thermogravimetric studies defined that calcination at 600 °C results in crystalline ceramic fibers without carbon residues. The fibrous morphology and mean diameter (614 ± 100 nm) of the ceramic nanofibers were analyzed via scanning and transmission electron microscopy. A surface area of 7.472 m2/g was determined through nitrogen adsorption measurements, while a combination of X-ray diffraction and Raman spectroscopy was used to show the crystallinity and composition of the fibers after calcination—single T-phase Nb2O5. Its performance in the cathode of lithium–sulfur batteries was defined through electrochemical tests, and the obtained results were compared to a similar blank electrode. The initial discharge capacity of 0.5 C reached a value of 570 mAh∙g−1, while the reversible capacity of 406 mAh∙g−1 was retained after 200 cycles, representing a capacity retention of 71.3%. The presence of Nb2O5 nanofibers in the carbon cathode inhibits the shuttle effect through polysulphide confinement, which originates from porosity and chemical trapping.
期刊介绍:
Inorganics is an open access journal that covers all aspects of inorganic chemistry research. Topics include but are not limited to: synthesis and characterization of inorganic compounds, complexes and materials structure and bonding in inorganic molecular and solid state compounds spectroscopic, magnetic, physical and chemical properties of inorganic compounds chemical reactivity, physical properties and applications of inorganic compounds and materials mechanisms of inorganic reactions organometallic compounds inorganic cluster chemistry heterogenous and homogeneous catalytic reactions promoted by inorganic compounds thermodynamics and kinetics of significant new and known inorganic compounds supramolecular systems and coordination polymers bio-inorganic chemistry and applications of inorganic compounds in biological systems and medicine environmental and sustainable energy applications of inorganic compounds and materials MD