5 years ago

Heterogeneous Double-Shelled Constructed Fe3O4 Yolk–Shell Magnetite Nanoboxes with Superior Lithium Storage Performances

Heterogeneous Double-Shelled Constructed Fe3O4 Yolk–Shell Magnetite Nanoboxes with Superior Lithium Storage Performances
Ming Chen, Ge Gao, Xiue Zhang, Xiao Shen, Lubin Ni, Wenlong Li, Rongfang Zhao, Lingyun Zhu, Qianhui Wu, Guowang Diao
Among the numerous candidate materials for lithium ion batteries, ferroferric oxide (Fe3O4) has been extensively concerned as a prospective anode material because of its high theoretical specific capacity, abundant resources, low cost, and nontoxicity. Here, we designed and fabricated a unique yolk–shell construction by generating heterogeneous double-shelled SnO2 and nitrogen-doped carbon on Fe3O4 yolk (denoted as Fe3O4@SnO2@C–N nanoboxes). The yolk–shell structured Fe3O4@SnO2@C–N nanoboxes have the adjustable void space, which permits the free expansion of Fe3O4 yolks without breaking the double shells during the lithiation/delithiation processes, avoiding the structural pulverization. Moreover, the heterogeneous double-shelled SnO2@C–N can meaningfully improve the electronic conductivity and enhance the lithium storage performance. Two metal oxides also show the specific synergistic effect, promoting the electrochemistry reaction. As a result, this yolk–shell structured Fe3O4@SnO2@C–N exhibits high specific capacity (870 mA h g–1 at 0.5 A g–1 after 200 cycles), superior rate capability, and long cycle life (670 mA h g–1 at 3 A g–1 after 600 cycles). This design and construction method can be extended to synthesize other yolk–shell nanostructured anode materials with improved electrochemistry performance.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b07443

DOI: 10.1021/acsami.7b07443

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