Toward advanced sodium-ion batteries : A wheel-inspired yolk-shell design for large-volume-change anode materials

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hui Xu
  • Liguang Qin
  • Jian Chen
  • Wei Zhang
  • Peigen Zhang
  • Wubian Tian
  • Yao Zhang
  • Xinli Guo
  • Zhengming Sun

Detail(s)

Original languageEnglish
Pages (from-to)13153-13163
Journal / PublicationJournal of Materials Chemistry A
Volume6
Issue number27
Online published4 Jun 2018
Publication statusPublished - 21 Jul 2018

Abstract

Yolk-shell structures have found great potential in addressing the huge volume change of alloy-type anodes for lithium-/sodium-ion batteries (LIBs/SIBs). The main challenges associated with yolk-shell structures are the sluggish electron/ion transfer at the yolk-shell interface caused by the point-to-point contact between the yolk and the shell, and the rupture of self-supporting carbon shells during a long-term cycle. Here, inspired by the structure of a wheel, we designed and fabricated a novel yolk-shell structure with a multipoint contact between the yolk and the shell (wheel-shell structure) through a general and scalable approach. The multipoint contact is achieved by bridging SnO2 yolks and graphene shells using carbon nanoribbons, which allows a high-efficiency transfer of electrons and ions inside/outside the wheel-shell structure. Moreover, the interconnected graphene shells function not only as an electrical highway so that all active materials are electrochemically active, but also as a mechanical backbone to maintain the structural integrity. As an anode for SIBs, the wheel-shell structure exhibits extraordinary rate capability (153.3 mA h g-1 at 10.0 A g-1) and robust cycling stability (248.2 mA h g-1 remaining after 1000 cycles at 1.0 A g-1 with a capacity retention of 86.9%). These results demonstrate the most efficient SnO2-based anode ever reported for SIBs. More importantly, the proposed strategy opens up new avenues to boost the electrochemical performance of large-volume-change anode materials for advanced battery systems.

Citation Format(s)

Toward advanced sodium-ion batteries : A wheel-inspired yolk-shell design for large-volume-change anode materials. / Xu, Hui; Qin, Liguang; Chen, Jian; Wang, Zuankai; Zhang, Wei; Zhang, Peigen; Tian, Wubian; Zhang, Yao; Guo, Xinli; Sun, Zhengming.

In: Journal of Materials Chemistry A, Vol. 6, No. 27, 21.07.2018, p. 13153-13163.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review