SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 5: Materials in Energy Conversion: Mechanical Properties and Solid State Batteries

MM 5.5: Vortrag

Montag, 27. März 2023, 11:15–11:30, SCH A 215

Construction of V5S8/Sb2S3@C Heterostructures as High-Performance Anode Materials for Potassium -ion Batteries — •Vincent Hartmann, Yulian Dong, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Transition metal sulfides (TMSs) have been studied widely and deeply as anode materials for potassium ion batteries (PIBs) owing to their relatively high theoretical capacities. However, poor electrical conductivity, large volume expansion, and slow diffusion kinetics hinder their further applications. Herein, a unique hierarchical structure of V5S8/Sb2S3@C is fabricated by a concise solvothermal method and subsequently annealing. Such a well-designed architecture affords fast K+ diffusion kinetics and improved charge transfer at the heterointerfaces due to the metallicity of the internal V5S8. In addition, the synergistic coupling interaction among the interior V5S8, interlayer Sb2S3, and external C layer generates a stable nanostructure, which extremely accelerates the electronic/ion transport and effectively alleviates the volume expansion upon long cyclic performance. As a result, it exhibits a high initial capacity of 525.19 mAh/g at 100 mA/g and excellent cyclic stability with 95% capacity retention after 500 cycles at 1 A/g. Our results reveal that the combination of heterostructures construction and interfacial interaction enables optimizing electronic structures and macroscopic mechanical properties of TMSs, thus achieving high-performance anodes for PIBs with high energy density.