Berlin 2024 – scientific programme
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AKE: Arbeitskreis Energie
AKE 2: Processes and Materials for Energy Technologies
AKE 2.5: Talk
Tuesday, March 19, 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. Mohamed2,4, 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 Fe1−xSex. 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