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Current collectors based on multiwalled carbon-nanotubes and fewlayer graphene for enhancing the conversion process in scalable lithium-sulfur battery

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Nano Research 2023年第6期16卷 8433-8447页

作者： Vittorio Marangon Edoardo Barcaro Luca Minnetti Wolfgang Brehm Francesco Bonaccorso Vittorio Pellegrini Jusef Hassoun Graphene Labs Istituto Italiano di TecnologiaGenoa 16163Italy Department of Chemical Pharmaceutical and Agricultural SciencesUniversity of FerraraFerrara 44121Italy BeDimensional S.p.A. Genoa 16163Italy National Interuniversity Consortium of Materials Science and Technology(INSTM) University of Ferrara Research UnitFerrara 44121Italy

We investigated herein the morphological,structural,and electrochemical features of electrodes using a sulfur(S)-super P carbon(SPC)composite(i.e.,S@SPC-73),and including few-layer graphene(FLG),multiwalled carbon nanotubes(MWCNTs),or a mixture of them within the current collector ***,we studied the effect of two different electron-conducting agents,that is,SPC and FLG,used in the slurry for the electrode *** supports have high structural crystallinity,while their morphologies are dependent on the type of material *** voltammetry(CV)shows a reversible and stable conversion reaction between Li and S with an activation process upon the first cycle leading to the decrease of cell *** activation process is verified by electrochemical impedance spectroscopy(EIS)with a decrease of the resistance after the first CV ***,CV at increasing scan rates indicates a Li+diffusion coefficient(D)ranging between 10^(−9) and 10^(−7) cm^(2)·s^(−1)in the various states of charge of the cell,and the highest D value for the electrodes using FLG as electron-conducting *** tests performed at constant current of C/5(1 C=1675 mA·g_(s)^(−1))show high initial specific capacity values,which decrease during the initial cycles due to a partial loss of the active material,and subsequently increase due to the activation *** the electrodes show a Coulombic efficiency higher than 97%upon the initial cycles,and a retention strongly dependent on the electrode ***,this study suggests a careful control of the electrode in terms of current collector design and slurry composition to achieve good electrode morphology,mechanical stability,and promising electrochemical performance in practical Li-S cells.

关键词： lithium-sulfur battery current collector few-layer graphene carbon nanotubes scalability sulfur loading

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Characteristics of a gold-doped electrode for application in high-performance lithium-sulfur battery

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Journal of Energy Chemistry 2022年第1期31卷 116-128,I0004页

作者： Vittorio Marangon Daniele Di Lecce Dan J.L.Brett Paul R.Shearing Jusef Hassoun University of Ferrara Department of Chemical and Pharmaceutical SciencesVia Fossato di Mortara 17Ferrara44121Italy Electrochemical Innovation Lab Department of Chemical EngineeringUCLLondon WC1E 7JEUnited Kingdom The Faraday Institution Quad OneBecquerel AveHarwell CampusDidcot OX11 ORAUnited Kingdom National Interuniversity Consortium of Materials Science and Technology(INSTM) University of Ferrara Research UnitUniversity of FerraraVia Fossato di Mortara17Ferrara 44121Italy

Bulk sulfur incorporating 3 wt% gold nano-powder is investigated as possible candidate to maximize the fraction of active material in the Li-S battery *** material is prepared via simple mixing of gold with molten sulfur at 120℃,quenching at room temperature,and *** comprehensive study reports relevant electrochemical data,advanced X-ray computed tomography(CT)imaging of the positive and negative electrodes,and a thorough structural and morphological characterization of the S:Au 97:3 w/w *** cathode exhibits high rate capability within the range from C/10 to 1C,a maximum capacity above 1300 mAh gs^(-1),and capacity retention between 85%and 91%after 100 cycles at 1C and C/3 *** novel formulation enables a sulfur fraction in the composite cathode film as high as 78 wt%,an active material loading of 5.7 mg cm^(-2),and an electrolyte/sulfur(E/S)ratio of 5μL mg^(-1),which lead to a maximum areal capacity of 5.4 mAh cm^(-2).X-ray CT at the micro-and nanoscale reveals the microstructural features of the positive electrode that favor fast conversion kinetics in the *** analysis of sulfur distribution in the porous cathode displays that electrodeposition during the initial cycle may trigger an activation process in the cell leading to improved ***,the tomography study reveals the characteristics of the lithium anode and the cell separator upon a galvanostatic test prolonged over 300 cycles at a 2C rate.

关键词： Lithium-sulfur battery sulfur loading Electrolyte/sulfur ratio Gold nanoparticles X-ray tomography

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Synthesis of Highly Microporous sulfur-Containing Activated Carbons by a Multistep Modification Process

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Journal of Wuhan University of Technology(Materials Science) 2020年第5期35卷 856-862页

作者： FANG Kai SHENG Jie YANG Rendang State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641China

The sulfur-containing activated carbons(SACs)were prepared by CO2 activation and sulfur *** sulfur-containing samples were then oxidized in *** SACs were characterized by N2 adsorption,elemental analysis,thermogravimetric analysis,X-ray photoelectron spectroscopy,Raman spectroscopy,and X-ray *** CO2 activation provided precursor carbons with high porosity,which in turn were sulfurized *** in air at 200℃enlarged pores and redistributed amorphous sulfur in the hierarchical pores.A typical SAC containing 17.89%sulfur exhibited a surface area of 1464 m2/*** work may open up a valid route to prepare highly microporous SACs with high sulfur loading for applications where the presence of sulfur is beneficial.

关键词： sulfur loading micropore CO2 ctivation air oxidation porous carbons

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