Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 80: SYLI: Symposium Interfacial Challenges in Solid-State Li Ion Batteries - Structure - property relationships II

O 80.4: Talk

Wednesday, March 22, 2017, 16:30–16:45, IFW D

Large-scale highly ordered Sb nanorod arrays anode with high capacity and rate capability for sodium-ion batteries — •Liying Liang, Yang Xu, Chengliang Wang, Liaoyong Wen, Yaoguo Fang, Yan Mi, Min Zhou, Huaping Zhao, and Yong Lei — Institute for Physics and IMN MacroNano, Ilmenau University of Technology, Ilmenau 98693, Germany.

The poor electrochemical performance of Na-ion batteries is the major bottleneck for future development. Hence a performance-oriented electrode structure is proposed, which is 1D nanostructure arrays with large-scale high ordering, well vertical alignment, and large interval spacing. Benefiting from these structure merits, a great enhancement on electrochemical performance could be achieved. To Sb as an example, we firstly report large-scale highly ordered Sb nanorod arrays with uniform large interval spacing (190 nm). In return for this electrode design, high ion accessibility, fast electron transport, and strong electrode integrity are presented here. Used as additive-free anode for SIBs, Sb nanorod arrays showed a high capacity of 620 mAh g-1 at the 100th cycle with a retention of 84% up to 250 cycles at 0.2 A g-1, and superior rate capability for delivering reversible capacities of 579.7 and 557.7 mAh g-1 at 10 and 20 A g-1, respectively. A full cell coupled by P2-Na2/3Ni1/3Mn2/3O2 cathode and Sb nanorod arrays anode was also conducted, which showed a good cycle performance up to 250 cycles, high rate capability up to 20 A g-1, and large energy density up to 130 Wh kg-1.