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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.47: Poster

Mittwoch, 20. März 2024, 18:00–20:30, Poster E

High-performance aqueous zinc-ion batteries based on the three dimensional manganese vanadate nanoflower cathode — •Yan Ran¹, Yude Wang², Huaping Zhao¹, and Yong Lei¹ — ¹Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany — ²Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, Yunnan University, 650091 Kunming, China

In this work, manganese vanadate (MnVO) synthesized via a one-step hydrothermal method is proposed as a promising cathode material for aqueous zinc ion batteries (AZIBs). Because the stable layered structure and hieratical morphology of MnVO provide a large layer space for rapid ion transports, this material exhibits high specific capacity (433 mAh g-1 at 0.1 A g-1), an outstanding long-term cyclability (5000 cycles at a current density of 3 A g-1), and an excellent energy density. To illustrate the intercalation mechanism, ex situ X-Ray diffraction, Fourier transform infrared spectroscopy, and X-ray photo-electron spectroscopy are adopted, uncovering an H+/Zn2+ dual-cation co-intercalation processes. In addition, density-functional theory calculation analysis shows that MnVO has a delocalized electron cloud and the diffusion energy barrier of Zn2+ in MnVO is low, which promotes the Zn2+ transport and consequently improves the reversibility of the battery upon deep cycling. The key and enlightening insights are provided in the results for designing highperformance vanadium-oxide-based cathode materials for AZIBs.

Keywords: aqueous Zn-ion batteries; high reversibility; MnV12O31·10H2O; vanadate; Zn2+/H+ storage mechanism