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

被引:64
作者
He, Yanyan [1 ]
Dong, Caifu [2 ]
He, Sijia [1 ]
Li, Huan [1 ]
Sun, Xiuping [3 ,4 ]
Cheng, Yuan [1 ]
Zhou, Guowei [1 ]
Xu, Liqiang [3 ,4 ]
机构
[1] Qilu Univ Technol, Shandong Acad Sci, Sch Chem & Chem Engn, Key Lab Fine Chem Univ Shandong, Jinan 250353, Peoples R China
[2] Yantai Univ, Sch Environm & Mat Engn, Yantai 264005, Peoples R China
[3] Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China
[4] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China
基金
中国国家自然科学基金;
关键词
nickel cobalt sulfides; hierarchical coralliform architecture; sodium-ion batteries; anode materials; pseudocapacitive behavior; HIGH-PERFORMANCE ANODE; PRUSSIAN BLUE ANALOG; RATE CAPABILITY; CYCLE LIFE; BATTERIES; GRAPHENE; NANOSPHERES; NITROGEN; SUPERCAPACITORS; NANOPARTICLES;
D O I
10.1007/s12274-021-3328-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
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 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.
引用
收藏
页码:4014 / 4024
页数:11
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