The richness of V2O5 polymorphs as superior cathode materials for sodium insertion

In this paper, a special emphasis is given to the newly obtained electrochemical properties at room temperature of the two-dimensional ε′- and γ′-V2O5 polymorphs as sodium intercalation compounds. The structural peculiarities and electrochemical properties of each phase are presented. A full electro...

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Bibliographic Details
Published in:Electrochimica acta 2018-04, Vol.270, p.129-137
Main Authors: Baddour-Hadjean, R., Safrany Renard, M., Emery, N., Huynh, L.T.N., Le, M.L.P., Pereira-Ramos, J.P.
Format: Article
Language:English
Subjects:
Bilayered
Cathode
Chemical Sciences
Material chemistry
Na insertion
Na-ion battery
γ′-V2O5
ε′-V2O5
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Summary:In this paper, a special emphasis is given to the newly obtained electrochemical properties at room temperature of the two-dimensional ε′- and γ′-V2O5 polymorphs as sodium intercalation compounds. The structural peculiarities and electrochemical properties of each phase are presented. A full electrochemical and structural reversibility is demonstrated for both compounds upon sodium insertion at high voltage of 2.8 V. This noticeable voltage enhancement (+1 V) compared to α-V2O5 cathode is ascribed to the specific layers organization consisting of bilayered and puckered sheets in ε′-V2O5 and γ′-V2O5, respectively. Promising data, with large capacities (from 120 to 200 mAh g−1) and an excellent cycle life allow to identify new high performance V2O5- forms as positive electrode materials for sodium-ion batteries. •Novel layered vanadium oxides as cathode materials for NIBs.•Facile room temperature synthesis of γ′-V2O5 and ε′-V2O5.•Voltage enhancement controlled by V2O5 layers structuration.•High stable capacities: 120–200 mAh g− 1 over 50 cycles.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.03.062