Kinetically Accelerated Lithium Storage in High‐Entropy (LiMgCoNiCuZn)O Enabled By Oxygen Vacancies

High‐entropy oxides (HEOs) are gradually becoming a new focus for lithium‐ion battery (LIB) anodes due to their vast element space/adjustable electrochemical properties and unique single‐phase retention ability. However, the sluggish kinetics upon long cycling limits their further generalization. He...

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Published inSmall (Weinheim an der Bergstrasse, Germany) Vol. 18; no. 18; pp. e2200524 - n/a
Main Authors Liu, Xuefeng, Xing, Yingying, Xu, Ke, Zhang, Haijun, Gong, Mingxing, Jia, Quanli, Zhang, Shaowei, Lei, Wen
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 01.05.2022
Subjects
Anodes
Charge transfer
Electrochemical analysis
Entropy
high‐entropy oxides
Kinetics
Lithium-ion batteries
Molten salts
Nanotechnology
Oxygen
oxygen defects
Surface defects
Vacancies
anodes
lithium-ion batteries
kinetics
high-entropy oxides
oxygen defects
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Summary:High‐entropy oxides (HEOs) are gradually becoming a new focus for lithium‐ion battery (LIB) anodes due to their vast element space/adjustable electrochemical properties and unique single‐phase retention ability. However, the sluggish kinetics upon long cycling limits their further generalization. Here, oxygen vacancies with targeted functionality are introduced into rock salt‐type (MgCoNiCuZn)O through a wet‐chemical molten salt strategy to accelerate the ion/electron transmission. Both experimental results and theoretical calculations reveal the potential improvement of lithium storage, charge transfer, and diffusion kinetics from HEO surface defects, which ultimately leads to enhanced electrochemical properties. The currently raised strategy offers a modular approach and enlightening insights for defect‐induced HEO‐based anodes. The oxygen vacancies with targeted functionality are introduced into a rock salt‐type high‐entropy oxide (HEO) through Li doping. Benefiting from this, (LiMgCoNiCuZn)O exhibits higher pseudocapacitance contribution, higher electronic/ionic conductivity, and faster Li+ diffusion kinetics, outperforming that of the pristine HEO. This work brings a broad perspective for the rational design and performance modulation of defect‐modified HEO anodes.
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ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202200524