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Micropore engineering on hollow nanospheres for ultra-stable sodium-selenium batteries

Journal of Energy Chemistry 2023年第5期80卷 99-109,I0004页

作者： Gongke Wang Yumeng Chen Yu Han Lixue Yang Wenqing Zhao Changrui Chen Zihao Zeng Shuya Lei Shaohui Yuan Peng Ge School of Materials Science and Engineering Henan Engineering Research Center of Design and Recycle for Advanced Electrochemical Energy Storage MaterialsHenan Normal UniversityXinxiang 453007HenanChina Comprehensive Energy Research Center Institute of Science and TechnologyChina Three Gorges CorporationBeijing 100038China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Attracted by high energy density and considerable conductivity of selenium(Se),Na-Se batteries have been deemed promising energy-storage systems.But,it still suffers from sluggish kinetic behaviors and similar“shuttling effect”to S-electrodes.Herein,utilizing uniform hollow carbon spheres as precursors,Se-material is effectively loaded through vapor-infiltration method.Owing to the distribution of optimized pores,the content of microspores could be up to~60%(<2 nm),serving important roles for the physical confinement effect.Meanwhile,the rich oxygen-containing groups and N-elements could be noted,inducing the evolution of electron-moving behaviors.More significantly,assisted by the interfacial C-Se bonds and tiny Se distributions,Se electrodes are activated during cycling.Used as cathodes for Na-Se systems,the as-resulted samples display a capacity of 593.9 mA h g^(-1)after 100 cycles at the current density of 0.1 C.Even after 6000 cycles,the capacity could be still kept at about 225 mA h g^(-1)at 5.0 C.Supported by the detailed kinetic analysis,the designed microspores size induces the increasing redox reaction of nano Se,whilst the surface traits further render the enhancement of pseudo-capacitive contributions.Moreover,after cycling,the product Sex(x<4)in pores serves as the primary active material.Given this,the work is anticipated to provide an effective strategy for advanced electrodes for Na-Se systems.

关键词： Carbon host Tailoring pores Heteroatom doping Vapor-infltration method sodium-selenium batteries

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High‑Energy Room‑Temperature sodium–Sulfur and sodium–selenium batteries for Sustainable Energy Storage

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Electrochemical Energy Reviews 2023年第1期6卷 87-147页

作者： Zefu Huang Pauline Jaumaux Bing Sun Xin Guo Dong Zhou Devaraj Shanmukaraj Michel Armand Teofilo Rojo Guoxiu Wang Centre for Clean Energy Technology School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology SydneyUltimoNSW 2007Australia Centre for Cooperative Research on Alternative Energies(CIC energiGUNE) Basque Research and Technology Alliance(BRTA)Alava Technology ParkAlbert Einstein 4801510 Vitoria-GasteizSpain Inorganic Chemistry Department University of the Basque Country UPV/EHUP.O.Box.64448080 BilbaoSpain

Rechargeable room-temperature sodium–sulfur(Na–S)and sodium–selenium(Na–Se)batteries are gaining extensive attention for potential large-scale energy storage applications owing to their low cost and high theoretical energy density.Optimization of electrode materials and investigation of mechanisms are essential to achieve high energy density and long-term cycling stability of Na–S(Se)batteries.Herein,we provide a comprehensive review of the recent progress in Na–S(Se)batteries.We elucidate the Na storage mechanisms and improvement strategies for battery performance.In particular,we discuss the advances in the development of battery components,including high-performance sulfur cathodes,optimized electrolytes,advanced Na metal anodes and modified separators.Combined with current research achievements,this review outlines remaining challenges and clear research directions for the future development of practical high-performance Na–S(Se)batteries.

关键词： sodium-sulfur batteries sodium-selenium batteries Sulfur cathodes Electrolyte engineering Solid-state electrolytes sodium metal anodes

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