Ordered-mesoporous Nb2O5/carbon composite as a sodium insertion material

The present work introduces a new intercalation host for the Na ions, Nb2O5, and proposes that a mesoporous Nb2O5/carbon composite can function as a promising sodium insertion material. The highly ordered mesoporous Nb2O5/carbon electrode, synthesized using a block copolymer-assisted one-pot method,...

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Bibliographic Details
Published in:Nano energy 2015-09, Vol.16, p.62-70
Main Authors: Kim, Haegyeom, Lim, Eunho, Jo, Changshin, Yoon, Gabin, Hwang, Jongkook, Jeong, Sanha, Lee, Jinwoo, Kang, Kisuk
Format: Article
Language:English
Subjects:
Electrode
Intercalation compounds
Mesoporous
Nb2O5
Sodium ion batteries
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Summary:The present work introduces a new intercalation host for the Na ions, Nb2O5, and proposes that a mesoporous Nb2O5/carbon composite can function as a promising sodium insertion material. The highly ordered mesoporous Nb2O5/carbon electrode, synthesized using a block copolymer-assisted one-pot method, demonstrated not only a stable cycle life, but also outstanding rate capability. The excellent Na storage properties of the Nb2O5/carbon electrode were due to the uniquely ordered mesoporous nanostructure and in situ carbon formation whose configuration provided a large electrode–electrolyte interface area and enhanced Na ion and electron transport. Ex situ analyses revealed that Nb2O5 stores Na ions through Na de/intercalation reactions combined with surface capacitive reactions, after the activation process during the first sodiation. [Display omitted] •We introduce a mesoporous Nb2O5/carbon composite electrode for Na-ion batteries.•Nb2O5/carbon electrode uses Na de/intercalation reaction combined with surface one.•The mesoporous structure accommodates the large volume change upon de/sodiation.•The mesoporous structure facilitates electrolyte penetration.
ISSN:2211-2855
DOI:10.1016/j.nanoen.2015.05.015