【摘 要】
：
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 coba
【机 构】
：
Key Laboratory of Fine Chemicals in Universities of Shandong,School of Chemistry and Chemical Engine
论文部分内容阅读
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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