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HL: Fachverband Halbleiterphysik

HL 16: Functional Semiconductors for Renewable Energy Solutions I

HL 16.3: Talk

Tuesday, March 19, 2024, 10:00–10:15, ER 325

Constructing metal sulfide anodes with excellent K-ion storage properties via microstructure engineering — •Kangzhe Cao^1,2, Huiqiao Liu², Jiahui Ma², and Yong Lei¹ — ¹Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany — ²College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China

K-ion batteries (KIBs) feathered by abundant resources and high energy densities are considered a kind of ideal candidates for the large-scale energy storage systems. Anode materials, such as metal sulfides, with high capacity always hold more than one K ions per molecule, companying large volume expansion during cycling. This character endangers the stability of the electrode structure and the solid-electrolyte-interphase (SEI) on the active materials, resulting in low coulombic efficiency and limited cycle life. Herein, we would like to introduce a strategy to construct a series of high-performance metal sulfide anodes for KIBs via structure engineering, including conversion reaction anodes and conversion-alloy reaction anodes. We will demonstrate how the confining layer improves the coulombic efficiency of CuS anode, why the electrochemical reversibility of Sb2S3 anode is triggered by the synergistic effect of confining and catalysis, and how to improve the cycling stability of SnS2 through heterostructure designing. Our work confirms that the K-ion storage properties of metal sulfide anodes can be largely improved by microstructure engineering, offering a reliable strategy for designing high-performance KIB anodes.