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

Abstract : 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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https://hal.univ-lorraine.fr/hal-02896440
Contributor : Jean Jacques Gaumet Connect in order to contact the contributor
Submitted on : Friday, July 10, 2020 - 3:09:17 PM
Last modification on : Tuesday, October 6, 2020 - 3:25:06 AM

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Wen Luo, Feng Li, Weiran Zhang, Kang Han, Jean-Jacques Gaumet, et al.. Encapsulating segment-like antimony nanorod in hollow carbon tube as long-lifespan, high-rate anodes for rechargeable K-ion batteries. Nano Research, Springer, 2019, 12 (5), pp.1025-1031. ⟨10.1007/s12274-019-2335-6⟩. ⟨hal-02896440⟩

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