Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 55, Pages 14786-14793Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201802916
Keywords
anode materials; electrochemistry; Fe2O3; graphitic carbon; mesoporous materials; rate capability; sodium-ion batteries
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Funding
- National Natural Science Foundation of China
- NSFC [51572192, 51772205, 51472179, 51772208]
- General Program of Municipal Natural Science Foundation of Tianjin [17JCYBJC17000, 17JCYBJC22700]
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A mesoporous graphitic carbon-encapsulated Fe2O3 nanocomposite is synthesized as a superior anode material for sodium-ion batteries. A threefold strategy is adopted to achieve a high rate performance. First, the mesoporous structure with high specific surface area and large pore volume facilitates the transfer of electrolyte and accommodates the large volume change. Secondly, graphitic carbon encapsulation further improves the electronic conductivity of the nanocomposite. Finally, ultrafine Fe2O3 nanocrystals effectively shorten the Na+ diffusion length. Consequently, this nanocomposite exhibits stable and fast Na+ storage, thus leading to excellent rate capability and cyclability. Pseudocapacitive behavior is found to dominate in the redox reactions, accounting for the outstanding rate and cycling performance. In addition, full cells, assembled with O3-Na-0.9[Cu0.22Fe0.30Mn0.48]O-2 as cathodes, present good electrochemical performance.
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