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Pseudocapacitance-tuned high-rate and long-term cyclability of NiCo2S4 hexagonal nanosheets prepared by vapor transformation for lithium storage.

Authors :
Song, Yun
Chen, Ziliang
Li, Yanmei
Wang, Qinchao
Fang, Fang
Zhou, Yong-Ning
Hu, Linfeng
Sun, Dalin
Source :
Journal of Materials Chemistry A; 5/21/2017, Vol. 5 Issue 19, p9022-9031, 10p
Publication Year :
2017

Abstract

The high conductivity of bimetallic thiospinel NiCo<subscript>2</subscript>S<subscript>4</subscript> endows energy storage devices with very fascinating performance. However, the unsatisfactory rate capability and long-term cyclability of this material series significantly limit their large-scale practical applications such as in electric vehicles and hybrid electric vehicles. Herein, we successfully synthesized NiCo<subscript>2</subscript>S<subscript>4</subscript> hexagonal nanosheets with a large lateral dimension of ∼1.35 μm and a thickness of ∼30 nm through a vapor transformation method. The dynamic transformation process of the NiCo<subscript>2</subscript>S<subscript>4</subscript> polycrystalline nanosheets from NiCo-hydroxide has been revealed in detail. Originating from their two-dimensional thin-sheet structure with a high aspect ratio, the induced extrinsic capacitive contribution as high as 91% makes them an ideal candidate for high-capacity and high-rate lithium-ion anodes. The NiCo<subscript>2</subscript>S<subscript>4</subscript> nanosheets deliver a reversible capacity of 607 mA h g<superscript>−1</superscript> upon 800 cycles at a current density of 2 A g<superscript>−1</superscript>. This outstanding long cycle performance sheds light on the structural design of electrode materials for high-rate lithium-ion batteries. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20507488
Volume :
5
Issue :
19
Database :
Complementary Index
Journal :
Journal of Materials Chemistry A
Publication Type :
Academic Journal
Accession number :
123077162
Full Text :
https://doi.org/10.1039/c7ta01758h