Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 29, Pages 24662-24670Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07443
Keywords
Fe3O4; double-shelled SnO2@C-N; adjustable void space; yolk-shell structure; lithium ion batteries
Funding
- National Natural Science Foundation of China [21511140282]
- Natural Science Foundation of Jiangsu Province [BK20161329]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Qing Lan Project of Higher Learning Institutions in Jiangsu Province
- high end talent plan of Yangzhou Univ.
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology [JLCT201702]
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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 asFe(3)O(4)@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.
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