Efficient electrode material of Na-V2O5-reduced graphene oxide (rG-O) nanocomposite is synthesized by the restacking of anionic component nanosheets with Na+ ions at room temperature. The restacked Na-V2O5-rG-O nanocomposite shows layer-by-layer-ordered structure of V2O5/rG-O nanosheets and Na+ ions with mesoporous stacking structure and expanded surface area. Upon the restacking with rG-O, the pentavalent V5+ oxidation state and layered lattice of vanadium oxide nanosheet remain unchanged. The composite formation with rG-O leads to a significant enhancement of the discharge capacity from ~50 to ~150 mAh g-1 as cathode material for Na-ion batteries, underscoring the usefulness of restacking between metal oxide and rG-O nanosheets in exploring novel nanocomposite electrode materials.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government ( MSIP ) (No. NRF-2014R1A2A1A10052809 ) and by the Global Frontier R&D Program ( 2013-073298 ) on Center for Hybrid Interface Materials (HIM). The authors are grateful for Dr. N.-S. Lee (NINT, POSTECH) for TEM measurement. The experiments at PAL were supported in part by MOST and POSTECH.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering