Encapsulating segment-like antimony nanorod in hollow carbon tube as long-lifespan,high-rate anodes for rechargeable K-ion batteries

查看全文 作　　者：Wen [1]Luo;Feng [2]Li;Weiran [3]Zhang;Kang [4]Han;Jean-Jacques [5]Gaumet;Hans-Eckhardt [4,6]Schaefer;Liqiang [4]Mai

机构地区：[1]Department of Physics,School of Science,Wuhan University of Technology,Wuhan 430070,China;[2]Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230000,China;[3]Division of Materials Science and Engineering,Boston University,MA 02215,USA;[4]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,International School of Materials Science and Technology, Wuhan University of Technology,Wuhan 430070,China;[5]Laboratoire de Chimie et Physique: Approche Multi-echelles des Milieux Complexes,Institut Jean Barriol,Universite de Lorraine,Metz 57070,France;[6]Institute for Functional Matter and Quantum Technologies,Stuttgart University,Pfaffenwaldring 57,Stuttgart 70569,Germany

出　　处：《Nano Research》索引2019年第12卷第5期,共7页

基　　金：the National Natural Science Foundation of China (No.51832004);the National Natural Science Fund for Distinguished Young Scholars (No.51425204);the National Key R&D Program of China (No.2016YFA0202603);the Programme of Introducing Talents of Discipline to Universities (No.B17034);the Yellow Crane Talent (Science & Technology) Program of Wuhan City. 摘　　要：K-ion battery (KIB) is a new-type energy storage device that possesses potential advantages of low-cost and abundant resource of potassium.To develop advanced electrode materials for accommodating the large size and high activity of potassium ion is of great interests.Herein,a segment-like antimony (Sb) nanorod encapsulated in hollow carbon tube electrode material (Sb@HCT) was prepared.Beneficial from the virtue of abundant nitrogen doping in carbon tube,one-dimensional and hollow structure advantages,Sb@HCT exhibits excellent potassium storage properties:in the case of potassium bis(fluorosulfonyl)imide (KFSI) electrolyte,Sb@HCT displays a reversible capacity of up to 453.4 mAh·g^-1 at a current density of 0.5 A·g^-1 and good rate performance (a capacity of 211.5 mAh·g^-1 could be achieved at an ultrahigh rate of 5 A·g^-1).Additionally,Sb@HCT demonstrates excellent long-cycle stability at a current density of 2 A·g^-1 over 120 cycles.Meanwhile,electrolyte optimization is an effective strategy for greatly improving electrochemical performance.Through ex-situ characterizations,we disclosed the potassiation of Sb anode is quite reversible and undergoes multistep processes,combining solid solution reaction and two-phase reaction. 关键词：K-ion battery ANTIMONY anode hollow carbon TUBE encapsulation electrolyte optimizati on potassium storage mechanism

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Encapsulating segment-like antimony nanorod in hollow carbon tube as long-lifespan,high-rate anodes for rechargeable K-ion batteries

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