Facile Fabrication of Fe3O4@TiO2@C Yolk–Shell Spheres as Anode Material for Lithium Ion Batteries
Transition metal oxides have been actively exploited for application in lithium ion batteries due to their facile synthesis, high specific capacity, and environmental-friendly. In this paper, Fe 3 O 4 @TiO 2 @C yolk–shell (Y–S) spheres, used as anode material for lithium ion batteries, were successf...
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Veröffentlicht in: | Transactions of Tianjin University 2020-02, Vol.26 (1), p.3-12 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Transition metal oxides have been actively exploited for application in lithium ion batteries due to their facile synthesis, high specific capacity, and environmental-friendly. In this paper, Fe
3
O
4
@TiO
2
@C yolk–shell (Y–S) spheres, used as anode material for lithium ion batteries, were successfully fabricated by Stӧber method. XRD patterns reveal that Fe
3
O
4
@TiO
2
@C Y–S spheres possess a good crystallinity. But the diffraction peaks’ intensity of Fe
3
O
4
crystals in the composites is much weaker than that of bare Fe
3
O
4
spheres, indicating that the outer anatase TiO
2
@C layer can cover up the diffraction peaks of inner Fe
3
O
4
spheres. The yolk–shell structure of Fe
3
O
4
@TiO
2
@C spheres is further characterized by TEM, HAADF-STEM, and EDS mapping. The yolk–shell structure is good for improving the cycling stability of the inner Fe
3
O
4
spheres during lithium ions insertion–extraction processes. When tested at 200 mA/g, the Fe
3
O
4
@TiO
2
@C Y–S spheres can provide a stable discharge capacity of 450 mAh/g over 100 cycles, which is much better than that of bare Fe
3
O
4
spheres and TiO
2
@C spheres. Furthermore, cyclic voltammetry curves show that the composites have a good cycling stability compared to bare Fe
3
O
4
spheres. |
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ISSN: | 1006-4982 1995-8196 |
DOI: | 10.1007/s12209-019-00222-x |