Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 27: Poster Session I

MM 27.20: Poster

Dienstag, 13. März 2018, 18:30–19:45, Poster E

TiO2 inverse opals as high-performance sodium-ion battery anodes — •Yang Xu, Min Zhou, Chenglin Zhang, Liying Liang, and Yong Lei — Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany

Study of sodium-ion batteries (SIBs) has been rapidly increasing due to the growing demand of renewable energy. Electrochemical behaves of Na-ions are expected to be different from those of Li-ions because of the larger size of Na-ion, given a same host material. We employed TiO2 inverse opals as a model material to demonstrate the role of the orderliness of atomic arrangement in determining the SIB performance. We revealed that the disordering at the surface benefits to increase the contribution of surface process, while the disordering in the bulk results in improved ion diffusion but degraded electron transport. We therefore achieved high rate capability of the TiO2 inverse opals by enhancing surface ion availability that is enabled by the enhanced solvent wettability, regardless of the type of electrolytes and the concentration of Na-ion in the electrolytes. Our work offers a possibility to realize high SIB performance by adjusting the surface kinetics of the electrodes through controlling the orderliness of the atomic arrangement. This possibility could be transplanted to other energy storage systems.

[1] M. Zhou, Y. Xu, Y. Lei, et al., Adv. Energy Mater. 2016, 1600448. [2] M. Zhou, Y. Xu, Y. Lei, et al., Nano Energy 2017, 31, 514.