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Nano Research 2021, 14(11): 4014-4024 https://doi.org/10.1007/s12274-021-3328-9
Research Article | Issue | Published: 01 February 2021

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

Show Author's Information 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
Keywords:
sodium-ion batteries, anode materials, pseudocapacitive behavior, nickel cobalt sulfides, hierarchical coralliform architecture
Topics:
Cobalt compoundsCrystalline materials ElectrolytesIon batteriesMetal ionsNickel compoundsSodiumStorage (materials)
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
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Abstract Full text Electronic supplementary material About this article

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.


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About this article

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

Show Author's information 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

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 batteries, anode materials, pseudocapacitive behavior, nickel cobalt sulfides, hierarchical coralliform architecture

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Publication history
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Acknowledgements

Publication history

Received: 26 October 2020
Revised: 12 January 2021
Accepted: 13 January 2021
Published: 01 February 2021
Issue date: November 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

This work was supported by the Shandong Provincial Natural Science Foundation (Nos. ZR2020QB123, ZR2020QB108, and ZR2019MEM030), the National Natural Science Foundation of China (Nos. 51972180, 22071135, and 51572134), Academy of Sciences large apparatus United Fund of China (No. U1832187), Key Research & Development Project of Shandong Province (No. 2019GGX102070), and the Program for Scientific Research Innovation Team in Colleges and Universities of Jinan (No. 2018GXRC006).

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