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Research Article

Bimetallic nickel cobalt sulfides with hierarchical coralliform architecture for ultrafast and stable Na-ion storage

Yanyan He1, Caifu Dong3, Sijia He1, Huan Li1, Xiuping Sun2, Yuan Cheng1, Guowei Zhou1( ), Liqiang Xu2( )
Key Laboratory of Fine Chemicals in Universities of ShandongSchool of Chemistry and Chemical Engineering Qilu University of Technology (Shandong Academy of Sciences)Jinan 250353 China
Key Laboratory of Colloid & Interface ChemistryMinistry of Education and School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100 China
School of Environmental and Material Engineering Yantai UniversityYantai 264005 China
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Abstract

A series of bimetallic nickel cobalt sulfides with hierarchical micro/nano architectures were fabricated via a facile synthesis strategy of bimetallic micro/nano structure precursor construction-anion exchange via solvothermal method. Among the nickel cobalt sulfides with different Ni/Co contents, the coral-like Ni1.01Co1.99S4 (Ni/Co, 1/2) delivers ultrafast and stable Na-ion storage performance (350 mAh·g−1 after 1, 000 cycles at 1 A·g−1 and 355 mAh·g−1 at 5 A·g−1). The remarkable electrochemical properties can be attributed to the enhanced conductivity by co-existence of bimetallic components, the unique coral-like micro/nanostructure, which could prevent structural collapse and self-aggregation of nanoparticles, and the easily accessibility of electrolyte, and fast Na+ diffusion upon cycling. Detailed kinetics studies by a galvanostatic intermittent titration technique (GITT) reveal the dynamic change of Na+ diffusion upon cycling, and quantitative kinetic analysis indicates the high contribution of pseudocapacitive behavior during charge–discharge processes. Moreover, the ex-situ characterization analysis results further verify the Na-ion storage mechanism based on conversion reaction. This study is expected to provide a feasible design strategy for the bimetallic sulfides materials toward high performance sodium-ion batteries.

Keywords

sodium-ion batteriesanode materialspseudocapacitive behaviornickel cobalt sulfideshierarchical coralliform architecture

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Nano Research
Volume 14 Issue 11,
November 2021
Pages 4014-4024
DOI: 10.1007/s12274-021-3328-9
Cite this article:
He Y, Dong C, He S, et al. Bimetallic nickel cobalt sulfides with hierarchical coralliform architecture for ultrafast and stable Na-ion storage. Nano Research, 2021, 14(11): 4014-4024. https://doi.org/10.1007/s12274-021-3328-9
Topics:
Cobalt compoundsCrystalline materials ElectrolytesIon batteriesMetal ionsNickel compoundsSodiumStorage (materials)

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Received: 26 October 2020
Revised: 12 January 2021
Accepted: 13 January 2021
Published: 01 February 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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