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- Title
Lithium containing layered high entropy oxide structures.
- Authors
Wang, Junbo; Cui, Yanyan; Wang, Qingsong; Wang, Kai; Huang, Xiaohui; Stenzel, David; Sarkar, Abhishek; Azmi, Raheleh; Bergfeldt, Thomas; Bhattacharya, Subramshu S.; Kruk, Robert; Hahn, Horst; Schweidler, Simon; Brezesinski, Torsten; Breitung, Ben
- Abstract
Layered Delafossite-type Lix(M1M2M3M4M5...Mn)O2 materials, a new class of high-entropy oxides, were synthesized by nebulized spray pyrolysis and subsequent high-temperature annealing. Various metal species (M = Ni, Co, Mn, Al, Fe, Zn, Cr, Ti, Zr, Cu) could be incorporated into this structure type, and in most cases, single-phase oxides were obtained. Delafossite structures are well known and the related materials are used in different fields of application, especially in electrochemical energy storage (e.g., LiNixCoyMnzO2 [NCM]). The transfer of the high-entropy concept to this type of materials and the successful structural replication enabled the preparation of novel compounds with unprecedented properties. Here, we report on the characterization of a series of Delafossite-type high-entropy oxides by means of TEM, SEM, XPS, ICP-OES, Mössbauer spectroscopy, XRD including Rietveld refinement analysis, SAED and STEM mapping and discuss about the role of entropy stabilization. Our experimental data indicate the formation of uniform solid-solution structures with some Li/M mixing.
- Subjects
LITHIUM compounds; OXIDE synthesis; PYROLYSIS; ANNEALING of metals; ENERGY storage; GIBBS-Helmholtz equation
- Publication
Scientific Reports, 2020, Vol 10, Issue 1, pN.PAG
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-020-75134-1