Enhancement of Sodium Ion Battery Performance Enabled by Oxygen Vacancies

The utilization of oxygen vacancies (OVs) in sodium ion batteries (SIBs) is expected to enhance performance, but as yet it has rarely been reported. Taking the MoO3−x nanosheet anode as an example, for the first time we demonstrate the benefits of OVs on SIB performance. Moreover, the benefits at de...

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Published inAngewandte Chemie International Edition Vol. 54; no. 30; pp. 8768 - 8771
Main Authors Xu, Yang, Zhou, Min, Wang, Xin, Wang, Chengliang, Liang, Liying, Grote, Fabian, Wu, Minghong, Mi, Yan, Lei, Yong
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag 20.07.2015
WILEY‐VCH Verlag
Wiley Subscription Services, Inc
EditionInternational ed. in English
Subjects
alumina
Anodes
Coating
Diffusion coefficient
Electric batteries
Electrical conductivity
Energy storage
molybdenum
nanomaterials
Nanostructure
Oxygen
oxygen vacancies
Sodium
sodium ion batteries
Vacancies
alumina
nanomaterials
sodium ion batteries
molybdenum
oxygen vacancies
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Summary:The utilization of oxygen vacancies (OVs) in sodium ion batteries (SIBs) is expected to enhance performance, but as yet it has rarely been reported. Taking the MoO3−x nanosheet anode as an example, for the first time we demonstrate the benefits of OVs on SIB performance. Moreover, the benefits at deep‐discharge conditions can be further promoted by an ultrathin Al2O3 coating. A series of measurements show that the OVs increase the electric conductivity and Na‐ion diffusion coefficient, and the promotion from ultrathin coating lies in the effective reduction of cycling‐induced solid‐electrolyte interphase. The coated nanosheets exhibited high reversible capacity and great rate capability with the capacities of 283.9 (50 mA g−1) and 179.3 mAh g−1 (1 A g−1) after 100 cycles. This work may not only arouse future attention on OVs for sodium energy storage, but also open up new possibilities for designing strategies to utilize defects in other energy storage systems. The benefits of oxygen vacancies on sodium ion battery performance were demonstrated by using ultrathin Al2O3‐coated MoO3−x nanosheets as anodes. Owing to the increased electric conductivity and sodium ion diffusion coefficient as well as the reduced solid–electrolyte interphase at deep‐discharge conditions, the anodes exhibited high reversible capacity and great rate capability over long‐term cycling.
Bibliography:Shanghai Thousand Talent Plan and Innovative Research Team - No. IRT13078
istex:8745267D800F42F57B44C695B2BC5847DFF938B5
BMBF - No. 03Z1MN11
ark:/67375/WNG-23P99W11-Z
ArticleID:ANIE201503477
European Research Council - No. 240144
Volkswagen-Stiftung - No. I/83 984
This work was financially supported by the European Research Council (ThreeDsurface: 240144), BMBF (ZIK-3DNanoDevice: 03Z1MN11), Volkswagen-Stiftung (Herstellung funktionaler Oberflächen: I/83 984), and the Shanghai Thousand Talent Plan and Innovative Research Team (No. IRT13078). We thank Mr. Yong Yan for his assistant of the XRD measurement. We also thank Dr. Xiaodong Zhang for his assistant of the XPS measurement.
This work was financially supported by the European Research Council (ThreeDsurface: 240144), BMBF (ZIK‐3DNanoDevice: 03Z1MN11), Volkswagen‐Stiftung (Herstellung funktionaler Oberflächen: I/83 984), and the Shanghai Thousand Talent Plan and Innovative Research Team (No. IRT13078). We thank Mr. Yong Yan for his assistant of the XRD measurement. We also thank Dr. Xiaodong Zhang for his assistant of the XPS measurement.
These authors contributed equally to this work.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201503477