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

作　　者：Gongke Wang Yumeng Chen Yu Han Lixue Yang Wenqing Zhao Changrui Chen Zihao Zeng Shuya Lei Shaohui Yuan Peng Ge 

机构地区：[1]School of Materials Science and Engineering,Henan Engineering Research Center of Design and Recycle for Advanced Electrochemical Energy Storage Materials,Henan Normal University,Xinxiang 453007,Henan,China [2]Comprehensive Energy Research Center,Institute of Science and Technology,China Three Gorges Corporation,Beijing 100038,China [3]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China

出　　处：《Journal of Energy Chemistry》2023年第5期99-109,I0004,共12页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.21973028,52004334);the outstanding youth science fund of Henan Normal University(No.2021JQ02),Natural Science Foundation of Hunan Province(2021JJ20073);National Key Research and Development Program of China(2018YFC1901601 and 2019YFC1907801);Scientific Research Fund of Hunan Provincial Education Department,grant number(20C0085);Collaborative Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources,Foundation of State Key Laboratory of Mineral Processing(BGRIMM-KJSKL-2017-13)。

摘　　要：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 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]