Se—C Bonding Promoting Fast and Durable Na+ Storage in Yolk–Shell SnSe2@Se—C

Shuhao XIAO, Zhenzhe LI, Jintao LIU, Yushan SONG, Tingshuai LI, Yong XIANG*, Jun Song CHEN*, Qingyu YAN*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

100 Citations (Scopus)

Abstract

Tin-based compounds have received much attention as anode materials for lithium/sodium ion batteries owing to their high theoretical capacity. However, the huge volume change usually leads to the pulverization of electrode, giving rise to a poor cycle performance, which have severely hampered their practical application. Herein, highly durable yolk–shell SnSe2 nanospheres (SnSe2@Se—C) are prepared by a multistep templating method, with an in situ gas-phase selenization of the SnO2@C hollow nanospheres. During this process, Se can be doped into the carbon shell with a tunable amount and form Se—C bonds. Density functional theory calculation results reveal that the Se—C bonding can enhance the charge transfer properties as well as the binding interaction between the SnSe2 core and the carbon shell, favoring an improved rate performance and a superior cyclability. As expected, the sample delivers reversible capacities of 441 and 406 mAh g−1 after 2000 cycles at 2 and 5 A g−1, respectively, as the anode material for a sodium-ion battery. Such performances are significantly better than the control sample without the Se—C bonding and also other metal selenide-based anodes, evidently showing the advantage of Se doping in the carbon shell.

Original languageEnglish
Article number2002486
Number of pages9
JournalSmall
Volume16
Issue number41
Early online date22 Sept 2020
DOIs
Publication statusPublished - 15 Oct 2020
Externally publishedYes

Bibliographical note

The authors sincerely acknowledge the financial support provided by provided by the University of Electronic Science and Technology of China through the Fundamental Research Funds for the Central Universities (ZYGX2019J030), the financial support from Singapore MOE AcRF Tier 2 under Grant Nos. 2017-T2-2-069 and 2018-T2-01-010, and National Research Foundation of Singapore (NRF) Investigatorship, award Number NRF2016NRF-NRFI001-22.

Keywords

  • Li /Na ion batteries
  • Se —C bonding
  • SnSe
  • yolk–shell structure

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