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Synergy of cations in high entropy oxide lithium ion battery anode

Title data

Wang, Kai ; Hua, Weibo ; Huang, Xiaohui ; Stenzel, David ; Wang, Junbo ; Ding, Ziming ; Cui, Yanyan ; Wang, Qingsong ; Ehrenberg, Helmut ; Breitung, Ben ; Kübel, Christian ; Mu, Xiaoke:
Synergy of cations in high entropy oxide lithium ion battery anode.
In: Nature Communications. Vol. 14 (2023) Issue 1 . - 1487.
ISSN 2041-1723

Abstract in another language

High entropy oxides (HEOs) with chemically disordered multi-cation structure attract intensive interest as negative electrode materials for battery applications. The outstanding electrochemical performance has been attributed to the high-entropy stabilization and the so-called ‘cocktail effect’. However, the configurational entropy of the HEO, which is thermodynamically only metastable at room-temperature, is insufficient to drive the structural reversibility during conversion-type battery reaction, and the ‘cocktail effect’ has not been explained thus far. This work unveils the multi-cations synergy of the HEO Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O at atomic and nanoscale during electrochemical reaction and explains the ‘cocktail effect’. The more electronegative elements form an electrochemically inert 3-dimensional metallic nano-network enabling electron transport. The electrochemical inactive cation stabilizes an oxide nanophase, which is semi-coherent with the metallic phase and accommodates Li+ ions. This self-assembled nanostructure enables stable cycling of micron-sized particles, which bypasses the need for nanoscale pre-modification required for conventional metal oxides in battery applications. This demonstrates elemental diversity is the key for optimizing multi-cation electrode materials.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Research Institutions > Central research institutes > Bayerisches Zentrum für Batterietechnik - BayBatt
Result of work at the UBT: No
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 540 Chemistry
Date Deposited: 24 Nov 2023 09:35
Last Modified: 24 Nov 2023 09:35