Issue 26, 2023

Elucidating the electrochemical reaction mechanism of lithium-rich antiperovskite cathodes for lithium-ion batteries as exemplified by (Li2Fe)SeO

Abstract

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 an electrochemical cycling performance of 250 mA h g−1 at 0.1C 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.

Graphical abstract: Elucidating the electrochemical reaction mechanism of lithium-rich antiperovskite cathodes for lithium-ion batteries as exemplified by (Li2Fe)SeO

Supplementary files

Article information

Article type
Paper
Submitted
31 Jan 2023
Accepted
08 May 2023
First published
08 Jun 2023

J. Mater. Chem. A, 2023,11, 14294-14303

Elucidating the electrochemical reaction mechanism of lithium-rich antiperovskite cathodes for lithium-ion batteries as exemplified by (Li2Fe)SeO

L. Singer, M. A. A. Mohamed, H. Hahn, I. G. Gonzalez-Martinez, M. Hantusch, K. Wenelska, E. Mijowska, B. Büchner, S. Hampel, N. Gräßler and R. Klingeler, J. Mater. Chem. A, 2023, 11, 14294 DOI: 10.1039/D3TA00552F

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