Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Energy Storage and Batteries I

CPP 1.4: Vortrag

Montag, 18. März 2024, 10:30–10:45, H 0106

Structural engineering of two-dimensional nanosheets for sodium-ion storage — •Yuhua Chen, Yulian Dong, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Rechargeable sodium-ion batteries (SIBs), with their low cost and abundant Na reserves, have been promising candidates for energy storage and conversion. Among all cathode materials for SIBs, two-dimensional (2D) VOPO4 show high energy storage potential owing to their high working voltage, stable structure, and diverse structure. Nevertheless, the electrochemical performance of VOPO4 is hindered by many factors such as poor conductivity and limited intrinsic interlayer distance. Rational design and structural engineering of 2D nanosheets by intercalation chemistry, such as cationic intercalation, conductive polymer introduction, and atomic doping, tuning their physical and chemical properties, effectively enhances the storage of sodium in thin 2D nanosheets. Here, we explore intercalation chemistry for the storage of Na+ ions in layered VOPO4 hydrates, delivering a high average operating voltage of approximately 3.5 V. The introduction of Fe3+ ions result in a noteworthy increase in specific capacity, reaching 85 mAh g*1 at 0.1 C, which exhibits a commendable capacity retention rate of 62% over 50 cycles. This investigation underscores the substantial impact of Fe3+ doping on the electrochemical performance of VOPO4*2H2O nanosheets, positioning them as promising candidates for high energy density SIBs.

Keywords: sodium-ion batteries; energy storage; two-dimensional; cathode; nanosheets