Issue 44, 2017

Hierarchically porous-structured ZnxCo1−xS@C–CNT nanocomposites with high-rate cycling performance for lithium-ion batteries

Abstract

Transition metal sulfides are of great interest as anodes for lithium-ion batteries (LIBs) due to their high theoretical capacity and low cost. However, the poor cycling stability and rate performance are the critical problems that hinder their practical applications. In this work, a unique hybrid nanocomposite constructed from starfish-like ZnxCo1−xS rooted in porous carbon and strongly coupled carbon nanotubes (ZnxCo1−xS@C–CNTs) is demonstrated to address this concern. The designed nanocomposite integrates the high theoretical capacity of ZnxCo1−xS and the excellent conductivity as well as the excellent mechanical stability of CNTs. When evaluated as anode materials for LIBs, ZnxCo1−xS@C–CNTs exhibited a high reversible capacity of 635 mA h g−1 at a current density of 1.2 A g−1 after 1000 cycles and excellent high-rate capability (890 mA h g−1 and 750 mA h g−1 at current densities of 3.2 and 6.4 A g−1, respectively). The excellent electrochemical performance of ZnxCo1−xS@C–CNTs can be ascribed to its hierarchically porous structure design and the synergistic effect between ZnxCo1−xS@C and CNTs.

Graphical abstract: Hierarchically porous-structured ZnxCo1−xS@C–CNT nanocomposites with high-rate cycling performance for lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
11 Sep 2017
Accepted
15 Oct 2017
First published
16 Oct 2017

J. Mater. Chem. A, 2017,5, 23221-23227

Hierarchically porous-structured ZnxCo1−xS@C–CNT nanocomposites with high-rate cycling performance for lithium-ion batteries

H. Wang, Z. Chen, Y. Liu, H. Xu, L. Cao, H. Qing and R. Wu, J. Mater. Chem. A, 2017, 5, 23221 DOI: 10.1039/C7TA07993A

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