Berlin 2024 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Ib

MM 17.8: Poster

Monday, March 18, 2024, 18:30–20:30, Poster F

Modification of bimetallic sulfide anodes for sodium ion storage — •Zidong Wang — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Due to their high specific capacity and long cycle life, bimetallic sulfides are the preferred choice of researchers as anodes in sodium-ion batteries (SIBs). However, studies indicate that this class of materials often requires expensive elements such as Co, Sb, Sn, etc., and their performance is insufficient with the use of inexpensive Fe, V alone. Therefore, there is a need to explore the relationship between metal cations and anode performance so that the requirements of cost reduction and performance enhancement can be met simultaneously. In this work, a series of partially re-placed sulfides with different cation ratios have been prepared by hydrothermal method followed by heat treatment. By partially replacing Co in NiCo sulfides, all samples show improved capacity and stability over the original NiCo sulfides. As a result, the metal elements have different oxidation states, which leads to a higher capacity through their synergistic effects on each other.

Keywords: sodium-ion batteries; anode; multi-metal sulfides; partial cation replacement