Pressure-Stabilized High-Entropy (FeCoNiCuRu)S 2 Sulfide Anode toward Simultaneously Fast and Durable Lithium/Sodium Ion Storage.

Authors :: Cheng W
Liu J
Hu J
Peng W
Niu G
Li J
Cheng Y
Feng X
Fang L
Wang MS
Redfern SAT
Tang M
Wang G
Gou H
Source :: Small (Weinheim an der Bergstrasse, Germany) [Small] 2023 Jul; Vol. 19 (29), pp. e2301915. Date of Electronic Publication: 2023 May 15.
Publication Year :: 2023
Abstract: Pressure-stabilized high-entropy sulfide (FeCoNiCuRu)S <subscript>2</subscript> (HES) is proposed as an anode material for fast and long-term stable lithium/sodium storage performance (over 85% retention after 15 000 cycles @10 A g <superscript>-1</superscript> ). Its superior electrochemical performance is strongly related to the increased electrical conductivity and slow diffusion characteristics of entropy-stabilized HES. The reversible conversion reaction mechanism, investigated by ex-situ XRD, XPS, TEM, and NMR, further confirms the stability of the host matrix of HES after the completion of the whole conversion process. A practical demonstration of assembled lithium/sodium capacitors also confirms the high energy/power density and long-term stability (retention of 92% over 15 000 cycles @5 A g <superscript>-1</superscript> ) of this material. The findings point to a feasible high-pressure route to realize new high-entropy materials for optimized energy storage performance.<br /> (© 2023 Wiley-VCH GmbH.)

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