Bilateral Interfaces in In2Se3-CoIn2-CoSe2Heterostructures for High-Rate Reversible Sodium Storage

Shuhao XIAO, Xinyan LI, Wensi ZHANG, Yong XIANG, Tingshuai LI, Xiaobin NIU, Jun Song CHEN*, Qingyu YAN*

*Corresponding author for this work

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

105 Citations (Scopus)

Abstract

Metal selenides are considered as a group of promising candidates as the anode material for sodium-ion batteries due to their high theoretical capacity. However, the intrinsically low electrical and ionic conductivities as well as huge volume change during the charge-discharge process give rise to an inferior sodium storage capability, which severely hinders their practical application. Herein, we fabricated In2Se3/CoSe2 hollow nanorods composed of In2Se3/CoIn2/CoSe2 by growing cobalt-based zeolitic imidazolate framework ZIF-67 on the surface of indium-based metal-organic framework MIL-68, followed by in situ gaseous selenization. Because of the CoIn2 alloy phase in between In2Se3 and CoSe2, a heterostructure consisting of two alloy/selenide interfaces has been successfully constructed, offering synergistically enhanced electrical conductivity, Na diffusion process, and structural stability, in comparison to the single CoIn2-free interface with only two metal selenides. As expected, this nanoconstruction delivers a high reversible capacity of 297.5 and 205.5 mAh g-1 at 5 and 10 A g-1 after 2000 cycles, respectively, and a superior rate performance of 371.6 mAh g-1 at even 20 A g-1.

Original languageEnglish
Pages (from-to)13307-13318
Number of pages12
JournalACS Nano
Volume15
Issue number8
Early online date23 Jul 2021
DOIs
Publication statusPublished - 24 Aug 2021
Externally publishedYes

Bibliographical note

This work was financially supported by Fundamental Research Funds for the Central Universities (ZYGX2019J030). Q.Y. acknowledges the funding support from Singapore MOE AcRF Tier 1 grant no. 2020-T1-001-031.

Keywords

  • anode material
  • heterostructure
  • metal selenide
  • multi-interface
  • sodium-ion battery

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