期刊
NANO RESEARCH
卷 12, 期 5, 页码 1025-1031出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-019-2335-6
关键词
K-ion battery; antimony anode; hollow carbon tube encapsulation; electrolyte optimization; potassium storage mechanism
类别
资金
- National Natural Science Foundation of China [51832004]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Key R&D Program of China [2016YFA0202603]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Yellow Crane Talent (Science & Technology) Program of Wuhan City
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 mAhg(-1) at a current density of 0.5 Ag-1 and good rate performance (a capacity of 211.5 mAhg(-1) could be achieved at an ultrahigh rate of 5 Ag-1). Additionally, Sb@HCT demonstrates excellent long-cycle stability at a current density of 2 Ag-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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