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Nanotube-assembled pine-needle-like CuS as an effective energy booster for sodium-ion storage

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Abstract

Transition metal sulfides have emerged as attractive anode materials for sodium-ion batteries (SIBs) due to their favorable properties and abundant resources. However, very few metal sulfides are available now that fulfill all criteria regarding specific capacity, rate performance and long-term cyclability for commercial applications. Herein, we report a novel pine-needle-like CuS (PNL-CuS) self-assembled from hollow nanotubes together with its sodium storage properties between 3.0 and 0.3 V. Such a hierarchical architecture benefits the infiltration of the electrolyte, providing more active sites for Na+ storage and facilitating fast charge transfer, as reflected by the high reversible capacity (522 mA h g−1 at 0.1 A g−1), superior rate performance (317 mA h g−1 at 20 A g−1) and outstanding long-term cycle stability (1000 cycles without obvious fading at 5 A g−1) of the resulting materials. Moreover, ex situ HRTEM and ex situ XPS characterization reveal the phase transitions during Na+ uptake. The experimental results are further supported by density functional theory calculations, showing a preferential Na+ transfer pathway and the intrinsic metallic behavior of covellite CuS upon Na+ absorption. The exceptional performance together with a highly reversible conversion reaction indicates that CuS has great potential for large-scale energy storage.

Graphical abstract: Nanotube-assembled pine-needle-like CuS as an effective energy booster for sodium-ion storage

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Publication details

The article was received on 28 Dec 2018, accepted on 25 Mar 2019 and first published on 27 Mar 2019


Article type: Paper
DOI: 10.1039/C8TA12474D
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Nanotube-assembled pine-needle-like CuS as an effective energy booster for sodium-ion storage

    D. Yu, M. Li, T. Yu, C. Wang, Y. Zeng, X. Hu, G. Chen, G. Yang and F. Du, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA12474D

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