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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Focus Session: Battery Materials – Experimental Characterisation and Safety Testing (joint session KFM/MM)

KFM 17.11: Vortrag

Mittwoch, 20. März 2024, 18:45–19:05, EMH 225

Partially substituted metal sulfide anodes for high-performance sodium-ion batteries — •Zidong Wang — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Due to sodium resources' abundance and easy availability, sodium-ion battery technology has attracted extensive research interest and made significant progress in recent years. Among the various anode materials used for sodium-ion battery anodes, transition metal sulfides, especially bimetallic sulfides, have great potential due to their high capacity and electrochemical activity. In this work, the original bimetallic sulfide cations were partially replaced to improve the performance further. In this strategy, the synergistic effect of multi-metal cations will result in superior energy absorption and enhancement. Metal elements with different oxidation states can produce higher capacity through synergistic effects with each other. Mn-Ni-Co-S with 10% substitution showed satisfactory capacity (721.09 mAh/g at 300 mA/g and 662.58 mAh/g after 20 cycles) and excellent cycle life (85.41% capacity retention after 1000 cycles at 2000 mA/g).

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