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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Poster Session II

CPP 35.37: Poster

Wednesday, March 29, 2023, 11:00–13:00, P1

Antiperovskites (Li₂Fe)ChO as cathode material for lithium-ion batteries and investigation of the reaction mechanism — •Bowen Dong¹, Lennart Singer¹, Mohamed Abdullah Abdullah Mohamed², Silke Hampel², Nico Gräßler², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Germany — ²Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V., Germany

Due to it unique structure, antiperovskite (Li₂Fe)ChO (Ch = S, Se) have emerged as a promising Li-ion battery (LIB) cathode material with excellent rate capability and a good discharge capacity. We report synthesis of antiperovskites by a direct ball-milling process and evaluate the phase stability, cycling performance, and rate performance. The effect of post-synthesis heat treatment on the resulting materials as well as on its battery performance is studied. Cyclic voltammetry studies reveal a high-voltage decomposition process which progressively yields the formation of Fe_xCh_y. Galvanostatic measurements exhibit outstanding electrochemical cycling performance of antiperovskite-based cathodes of 250 mAh/g at 0.1 C. Further, we suggest a route to avoid the progressing conversion of (Li₂Fe)ChO (Ch=S, Se) to Fe_xCh_y which effectively improves the cell performance of antiperovskites.