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

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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.

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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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  1. Key Laboratory of Fine Chemicals in Universities of Shandong, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China

    Yanyan He, Sijia He, Huan Li, Yuan Cheng & Guowei Zhou

  2. Key Laboratory of Colloid & Interface Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China

    Xiuping Sun & Liqiang Xu

  3. School of Environmental and Material Engineering, Yantai University, Yantai, 264005, China

    Caifu Dong

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  1. Yanyan He
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He, Y., Dong, C., He, S. et al. Bimetallic nickel cobalt sulfides with hierarchical coralliform architecture for ultrafast and stable Na-ion storage. Nano Res. 14, 4014–4024 (2021). https://doi.org/10.1007/s12274-021-3328-9

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