Research Article


2019, 12(5): 1025–1031


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

Wen Luo1,§, Feng Li2,§, Weiran Zhang3, Kang Han4, Jean-Jacques Gaumet5, Hans-Eckhardt Schaefer4,6, and Liqiang Mai4 (*)

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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-échelles des Milieux Complexes, Institut Jean Barriol, Université de Lorraine, Metz 57070, France
6 Institute for Functional Matter and Quantum Technologies, Stuttgart University, Pfaffenwaldring 57, Stuttgart 70569, Germany
§ Wen Luo and Feng Li contributed equally to this work.

Keywords: K-ion battery, antimony anode, hollow carbon tube encapsulation, electrolyte optimization, potassium storage mechanism
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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.
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Encapsulating segment-like antimony nanorod in hollow carbon tube as long-lifespan, high-rate anodes for rechargeable K-ion batteries. Nano Res. 2019, 12(5): 1025–1031

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