Issue 70, 2019, Issue in Progress

Double-layer carbon protected CoS2 nanoparticles as an advanced anode for sodium-ion batteries

Abstract

Cobalt disulfides with high theoretical capacity are regarded as appropriate anode materials for sodium ion batteries (SIBs), but their intrinsically low conductivity and large volume expansion lead to a poor electrochemical performance. In this work, graphitic carbon coated CoS2 nanoparticles are encapsulated in bamboo-like carbon nanotubes by pyrolysis and sulfidation process. Graphitic carbon can improve the electrical conductivity and prevent the agglomeration of CoS2 nanoparticles. Meanwhile, bamboo-like carbon nanotubes can serve as conductive skeleton frames to provide rapid and constant transport pathways for electrons and offer void space to buffer the volume change of CoS2 nanoparticles. The advanced anode material exhibits a long-term capacity of 432.6 mA h g−1 at 5 A g−1 after 900 cycles and a rate capability of 419.6 mA h g−1 even at 10 A g−1 in the carbonate ester-based electrolyte. This avenue can be applicable for preparing other metal sulfide/carbon anode materials for sodium-ion batteries.

Graphical abstract: Double-layer carbon protected CoS2 nanoparticles as an advanced anode for sodium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
19 Oct 2019
Accepted
25 Nov 2019
First published
11 Dec 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 40956-40960

Double-layer carbon protected CoS2 nanoparticles as an advanced anode for sodium-ion batteries

X. Yao, H. Cheng, Y. Huang, Z. Jiang, Q. Han and S. Wang, RSC Adv., 2019, 9, 40956 DOI: 10.1039/C9RA08558K

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