Berlin 2024 – wissenschaftliches Programm

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AKE: Arbeitskreis Energie

AKE 2: Processes and Materials for Energy Technologies

AKE 2.5: Vortrag

Dienstag, 19. März 2024, 11:00–11:15, TC 006

Elucidating the electrochemical reaction mechanism of lithium-rich antiperovskite cathodes for lithium-ion batteries as exemplified by (Li₂Fe)SeO — •Lennart Singer¹, M.A.A. Mohamed^2,4, Henrik Hahn¹, Ignacio G. Gonzalez-Martinez², Karolina Wenelska³, Ewa Mijowska³, Bernd Büchner², Silke Hampel², Nico Gräßler², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, 69120 Heidelberg, Germany — ²Leibniz Institute for Solid State and Materials Research Dresden e.V., 01069 Dresden, Germany — ³Nanomaterials Physicochemistry Department, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, 71-065 Szczecin, Poland — ⁴Department of Physics, Faculty of Science, Sohag University, 82524 Sohag, Egypt

We report in the context of lithium-rich antiperovskite cathode materials outstanding electrochemical properties of (Li₂Fe)SeO, which for the first time was synthesized via direct ball-milling. The unique structured material displays a electrochemical cycling performance of 250 mAh g⁻¹ at 0.1 C when used as a cathode in lithium-ion batteries. Comprehensive electrochemical analysis combined with detailed transmission electron microscopy studies reveal that, above 2.5 V, the multi electron storage mechanism involves conversion of (Li₂Fe)SeO to Fe_1−xSe_x. Our results furthermore demonstrate the general relevance of our findings to the whole class of antiperovskite cathode materials and present a route to strongly enhance their cell performance by avoiding the degradation path deciphered by our studies.

Keywords: ithium-ion battery; LIB; cathode material; lithium-rich antiperovskites