Core-shell Fe3O4@Fe ultrafine nanoparticles as advanced anodes for Li-ion batteries

JOURNAL OF ALLOYS AND COMPOUNDS

卷:735

Article

Pang, Yuepeng^1,2  Wang, Jing^2,3  Zhou, Zhiguo^4,5  Yuan, Tao^1,2  Yang, Junhe^1,2  Sun, Dalin^2,3  Zheng, Shiyou^1,2 

[1] Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China

[2] Shanghai Innovat Inst Mat, Shanghai 200444, Peoples R China

[3] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

[4] Shanghai Normal Univ, Educ Minist, Key Lab Resource Chem, Shanghai 200234, Peoples R China

[5] Shanghai Normal Univ, Shanghai Key Lab Rare Earth Funct Mat, Shanghai 200234, Peoples R China

关键词: Energy storage materials;    Electrochemical reactions;    Nanostructured materials;    Composite materials;   

DOI  :  10.1016/j.jallcom.2017.11.193

来源: Elsevier

【 摘 要 】

Core-shell Fe3O4@Fe ultrafine nanoparticles (nano-Fe3O4@Fe, Fe3O4 content 84 wt%) with a core (Fe) diameter of 5.1 +/- 1.4 nm and a shell (Fe3O4) diameter of 10.9 +/- 1.6 nm is prepared by a liquid-phase pyrolysis and partial oxidation method. It is found that the core-shell Fe3O4@Fe ultrafine nanostructure can efficiently improve the electrochemical performance of Fe3O4 as anode material for Li-ion batteries in terms of rate capability and cycle life. For instance, specific capacities of 884 and 705 mAh/g can be obtained for the nano-Fe3O4@Fe electrode after 100 cycles at 200 mA/g and 500 cycles at 1000 mA/g, respectively. It is believed that these improvements can be attributed to the significant shortened transfer distance of electrons and Li-ions with relatively low specific surface area, ultrahigh electronic conductivity inside the nanoparticles and good ductility to accommodate the asymmetric volume change. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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