Cobalt-doping SnS2 nanosheets towards high-performance anodes for sodium ion batteries. Issue 1 (9th December 2019)

• Record Type: Journal Article
• Authors: Wang, Liqin; Zhao, Quanqing; Wang, Zhitao; Wu, Yujun; Ma, Xilan; Zhu, Youqi; Cao, Chuanbao
• Is Part Of: Nanoscale. Volume 12:Issue 1(2020)
• Page Start: 248
• Page End: 255
• Publication Date: 2019-12-09
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr07849e
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The stable 3D integral electrode structure and the heteroatom-doping effect of Sn0.9 Co0.1 S2 /CC nanosheets lead to outstanding electrochemical properties 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.