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- Title
Hollow and Yolk-Shell Iron Oxide Nanostructures on Few-Layer Graphene in Li-Ion Batteries.
- Authors
Sun, Zhenyu; Xie, Kunpeng; Li, Zi An; Sinev, Ilja; Ebbinghaus, Petra; Erbe, Andreas; Farle, Michael; Schuhmann, Wolfgang; Muhler, Martin; Ventosa, Edgar
- Abstract
We report a simple and template-free strategy for the synthesis of hollow and yolk-shell iron oxide (FeO x) nanostructures sandwiched between few-layer graphene (FLG) sheets. The morphology and microstructure of this material are characterized in detail by X-ray diffraction, X-ray absorption near-edge structure, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning and transmission electron microscopy. Its properties are evaluated as negative electrode material for Li-ion batteries and compared with those of solid FeO x/FLG and two commercial iron oxides. In all cases, the content of carbon in the electrode has a great influence on the performance. The use of pristine FLG improves the capacity retention and further enhancement is achieved with the hollow structure. For a low carbon loading of 18 wt. %, the presence of metallic iron in the hollow and yolk-shell FeO x/FLG composite significantly enhances the capacity retention, albeit with a relatively lower initial reversible capacity, retaining above 97 % after 120 cycles at 1000 mA g−1 in the voltage range of 0.1-3.0 V.
- Subjects
IRON oxide synthesis; NANOSTRUCTURES; GRAPHENE; LITHIUM-ion batteries; X-ray diffraction; X-ray photoelectron spectroscopy
- Publication
Chemistry - A European Journal, 2014, Vol 20, Issue 7, p2022
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201303723