Jump to main content
Jump to site search


Carbon capsule confined Sb2Se3 for fast Na+ extraction in sodium-ion batteries

Author affiliations

Abstract

Pulverization is a common phenomenon of alloy-based anode materials during the sodiation/desodiation process and usually leads to sluggish Na+ insertion/extraction kinetics. Although many studies have reported how to avoid or inhibit the occurrence of this phenomenon, it is still a great challenge in the research on alloy-based anode materials. Herein, we have achieved fast Na+ extraction in an Sb2Se3 alloy anode by constructing uniform carbon capsule confined Sb2Se3 composites (SSCs). Further analysis results indicate that the fast Na+ extraction is attributed to the uniform carbon capsule confined Sb2Se3 structure. In this structure, the carbon capsule can suppress the huge volume change of Sb2Se3 during the Na+ insertion process and uniformly release stress during the Na+ extraction process, maintaining the stable electrode structure. Specifically, Sb2Se3 is in situ pulverized in the intact carbon capsule and maintains the original rod-like outline, which provides a stable and short Na+ extraction pathway, good electrical contact, and a stable SEI layer on the surface of the intact carbon capsule and inhibits the side reaction of Sb2Se3. Therefore, the SSC exhibits fast Na+ extraction with a high reversible capacity of 324 mA h g−1 at 5 A g−1. The capacity is still as high as 380 mA h g−1 after 600 cycles at 2 A g−1.

Graphical abstract: Carbon capsule confined Sb2Se3 for fast Na+ extraction in sodium-ion batteries

Back to tab navigation

Supplementary files

Publication details

The article was received on 30 Sep 2019, accepted on 10 Nov 2019 and first published on 11 Nov 2019


Article type: Paper
DOI: 10.1039/C9SE00876D
Sustainable Energy Fuels, 2020, Advance Article

  •   Request permissions

    Carbon capsule confined Sb2Se3 for fast Na+ extraction in sodium-ion batteries

    L. Guo, L. Cao, J. Huang, J. Li and S. Chen, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/C9SE00876D

Search articles by author

Spotlight

Advertisements