SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster II

MM 23.9: Poster

Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2

high-rate and long-duration Sodium Storage Enabled by Sodiation-Driven Reconfiguration — •Yulian Dong, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Vanadium sulfides, with various crystal structures, such as VS2, V2S3, V3S4, V5S8, and VS4 have attracted increasing attention because they could provide high theoretical specific capacity. Nevertheless, such vanadium-based sulfides frequently suffer significant mechanical pulverization during long-term cycling as a result of volume expansion caused by sodization/desodization, which result in severe irreversible capacity degradation, poor initial coulombic efficiency, reduced rate capability, and inappreciable cycling stability. Here, we demonstrate a carbon-free 3D micro-nano flower-like VSx heterostructure electrode material that is synthesized by a facile hydrothermal process for SIB applications. The 3D micro-nano flower-like structure can well prevent the accumulation of nanosheets during electrochemical cycles and ensure full contact between the active material and the electrolyte. Therefore, 3D micro-nano flower-like VSx electrode that finally achieves an ultrahigh-rate capacity (613.8 mAh/g at 10 A/g) and an ultra-long cyclability (more than 1500 cycles) by sodiation-driven reconfiguration for sodium ions batteries. This work presents a general approach for preparing super-high specific capacity and rate capacity electrode materials for further improving the SIBs performance.