SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 42: Battery Materials (joint session KFM/CPP)

CPP 42.10: Talk

Thursday, March 30, 2023, 12:15–12:35, POT 51

3D flower-like MnV12O31 center dot 10H2O as a high-capacity and long-lifespan cathode material for aqueous zinc-ion batteries — •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, MnV12O31 center dot 10H2O (MnVO) synthesized via one-step hydrothermal method is proposed as a promising cathode material for AZIBs. Because its stable layered structure and hieratical morphology provide a large layer space for rapid ion transports, this material exhibits a high specific capacity (433 mAh g-1 at 0.1 A g-1), outstanding long-term cyclability (5000 cycles at current density of 3 A g-1), and sufficient energy density (454.65 Wh kg-1). To illustrate the intercalation mechanism, ex-situ X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) are adopted, uncovering a H+/Zn2+ dual-cation co-intercalation processes. Besides, density functional theory (DFT) 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 results provide key and enlightening insights for the design of high-performance vanadium-oxide-based cathode materials for AZIBs.