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Sustainable alternative cathodes of sodium-ion batteries using hybrid P2/O3 phase Na0.67Fe0.5Mn0.5-xMgxO2
No full textThe Na0.67Fe0.5Mn0.5-xMgxO2 compound with x = 0.02, 0.04, 0.06, 0.08, 0.1, 0.15 was synthesized by solid state reaction. The structure of the samples gradually transformed from P2 phase to O3 phase with the increase of Mg content. The hybrid P2/O3 phase transition metal oxides with high performance was prepared to promote the application of sodium-ion batteries. Na0.67Fe0.5Mn0.5-xMgxO2 exhibited a hybrid P2/O3 phase structure, which showed high electrochemical performance. Due to the synergy of P2 and O3 phase, the conductivity for the migration of Na ions in the experimental cell, exhibited the highest ion diffusivity. Here, Fe and Mn-based transition metal oxide materials as a cathode material can have great application potential for sodium-ion batteries and can be one of the most promising alternatives to the limited lithium-ion battery. (C) 2022 Elsevier B.V. All rights reserved
Delicate Co-Control of Shell Structure and Sulfur Vacancies in Interlayer-Expanded Tungsten Disulfide Hollow Sphere for Fast and Stable Sodium Storage
No full textHollow multishelled structure (HoMS) is a promising multi-functional platform for energy storage, owing to its unique temporal-spatial ordering property and buffering function. Accurate co-control of its multiscale structures may bring fascinating properties and new opportunities, which is highly desired yet rarely achieved due to the challenging synthesis. Herein, a sequential sulfidation and etching approach is developed to achieve the delicate co-control over both molecular- and nano-/micro-scale structure of WS2-x HoMS. Typically, sextuple-shelled WS2-x HoMS with abundant sulfur vacancies and expanded-interlayer spacing is obtained from triple-shelled WO3 HoMS. By further coating with nitrogen-doped carbon, WS2-x HoMS maintains a reversible capacity of 241.7 mAh g(-1) at 5 A g(-1) after 1000 cycles for sodium storage, which is superior to the previously reported results. Mechanism analyses reveal that HoMS provides good electrode-electrolyte contact and plentiful sodium storage sites as well as an effective buffer of the stress/strain during cycling; sulfur vacancy and expanded interlayer of WS2-x enhance ion diffusion kinetics; carbon coating improves the electron conductivity and benefits the structural stability. This finding offers prospects for realizing practical fast-charging, high-energy, and long-cycling sodium storage
Ganjiang Innovation Academy, Chinese Academy of Sciences, and Double Thousand Plan of Jiangxi Province[jxsq2020105012]
No full textSelf-Sensing Cementitious Composites with Hierarchical Carbon Fiber-Carbon Nanotube Composite Fillers for Crack Development Monitoring of a Maglev Girder
No full textIn view of high-performance, multifunctional, and low-carbon development of infrastructures, there is a growing demand for smart engineering materials, making infrastructures intelligent. This paper reports a new-generation self-sensing cementitious composite (SSCC) incorporated with a hierarchically structured carbon fiber (CF)-carbon nanotube (CNT) composite filler (CF-CNT), which is in situ synthesized by directly growing CNT on CF. Various important factors including catalyst, temperature, and gas composition are considered to investigate their kinetic and thermodynamic influence on CF-CNT synthesis. The reciprocal architecture of CF-CNT not only alleviates the CNT aggregation, but also significantly improves the interfacial bonding between CF-CNT and matrix. Due to the synergic and spatially morphological effects of CF-CNT, that is, the formation of widely distributed multiscale reinforcement networks, SSCCs with CF-CNTs exhibit high mechanical properties and electrical conductivity as well as excellent self-sensing performances, particularly enhanced sensing repeatability. Moreover, the SSCCs with CF-CNTs are integrated into a full-scale maglev girder to devise a smart system for crack development monitoring. The system demonstrates high sensitivity and fidelity to capture the initiation of cracks/damage, as well as progressive and sudden damage events until the complete failure of the maglev girder, indicating its considerable potential for structural health monitoring of infrastructures