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HL: Fachverband Halbleiterphysik

HL 53: Energy materials (other than photovoltaics)

HL 53.1: Vortrag

Freitag, 16. März 2018, 09:30–09:45, EW 202

Oxygen vacancies: effective strategy to boost sodium storage performance — •Yang Xu, Min Zhou, Chenglin Zhang, Liying Liang, and Yong Lei — Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany

Utilization of oxygen vacancies (OVs) is an effective strategy to boost electrochemical performance in sodium-ion batteries. We demonstrated that OVs could benefit oxide anodes regardless of their crystallinity, by taking amorphous SnO2 nanoarrays and crystalline MoO3-x nanosheets as examples. The OV-containing SnO2 nanoarrays delivered reversible capacities of 376 mAh g-1 after 100 cycles (0.05 A g-1) and 220 mAh g-1 after 800 cycles (1 A g-1) as well as great rate capability by retaining 200 mAh g-1 at 20 A g-1. Moreover, by coating the MoO3-x electrode with an ultrathin Al2O3 layer, the long-term cycling capacity and rate capability of MoO3-x were increased by four and ten times, respectively, comparing with the MoO3 electrode. Electrochemical kinetic study revealed that OVs could greatly enhance charge transfer/transport properties at the electrode/electrolyte interface and within the electrodes. Our work opens up new possibilities of designing strategies in energy storage systems.

[1] Y. Xu, M. Zhou, C. Zhang, C. Wang, L. Liang, Y. Fang, M. Wu, L. Cheng, Y. Lei, Nano Energy 2017, 38, 304. [2] Y. Xu, M. Zhou, X. Wang, C. Wang, L. Liang, F. Grote, M. Wu, Y. Mi, Y. Lei, Angew. Chem. Int. Ed. 2015, 54, 8768.