Dual-ion intercalation to enable high-capacity VOPO4 cathodes for Na-ion batteries

•Dual-ion insertion/extraction behaviors have been systematically investigated with both β- and αI-VOPO4 polymorph cathodes in Na cells.•VOPO4•2H2O and β-NaVOPO4 cathodes exhibit high discharge capacity of 240 mAh g−1 and 320 mAh g−1, respectively.•Theoretical studies reveal low Na-ion migration bar...

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Bibliographic Details
Published in:Electrochimica acta 2021-01, Vol.365, p.137376, Article 137376
Main Authors: Zhang, Ziheng, Ni, Yang, Avdeev, Maxim, Kan, Wang Hay, He, Guang
Format: Article
Language:English
Subjects:
Bond valence sum maps
Cathodes
Chemical reactions
Diffusion effects
Diffusion layers
Discharge
dual-ion reactions
Electrochemical analysis
Intercalation
Ion migration
Na-ion batteries
Na-ion migration
Rechargeable batteries
Redox reactions
Sodium-ion batteries
VOPO4 cathodes
Water chemistry
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Summary:•Dual-ion insertion/extraction behaviors have been systematically investigated with both β- and αI-VOPO4 polymorph cathodes in Na cells.•VOPO4•2H2O and β-NaVOPO4 cathodes exhibit high discharge capacity of 240 mAh g−1 and 320 mAh g−1, respectively.•Theoretical studies reveal low Na-ion migration barriers in layered VOPO4•2H2O. VOPO4 is a potential cathode candidate in sodium-ion batteries for multi-electron reactions to attain high capacity up to 330 mAh g−1. However, most current efforts are focused on the V5+/V4+ redox reaction with a moderate capacity of
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2020.137376