Issue 1, 2020

Cobalt-doping SnS2 nanosheets towards high-performance anodes for sodium ion batteries

Abstract

Layered SnS2 is considered as a promising anode candidate for sodium-ion batteries yet suffers from low initial coulombic efficiency, limited specific capacity and rate capability. Herein, we report a cobalt metal cation doping strategy to enhance the electrochemical performance of a SnS2 nanosheet array anode through a facile hydrothermal method. Benefitting from this special structure and heteroatom-doping effect, this anode material displays a high initial coulombic efficiency of 57.4%, a superior discharge specific capacity as high as 1288 mA h g−1 at 0.2 A g−1 after 100 cycles and outstanding long-term cycling stability with a reversible capacity of 800.4 mA h g−1 even at 2 A g−1. These excellent performances could be ascribed to the Co-doping effect that can increase the interlayer spacing, produce rich defects, regulate the electronic environment and improve conductivity. Besides, a carbon cloth substrate can maintain the integrity of the electrode material framework and buffer its volume variation, thus boosting intrinsic dynamic properties and enhancing sodium storage performance.

Graphical abstract: Cobalt-doping SnS2 nanosheets towards high-performance anodes for sodium ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
11 Sep 2019
Accepted
18 Nov 2019
First published
18 Nov 2019

Nanoscale, 2020,12, 248-255

Cobalt-doping SnS2 nanosheets towards high-performance anodes for sodium ion batteries

L. Wang, Q. Zhao, Z. Wang, Y. Wu, X. Ma, Y. Zhu and C. Cao, Nanoscale, 2020, 12, 248 DOI: 10.1039/C9NR07849E

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