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Published in: Rare Metals 9/2023

13-07-2023 | Original Article

Tuning single-phase medium-entropy oxides derived from nanoporous NiCuCoMn alloy as a highly stable anode for Li-ion batteries

Authors: Zhen-Yang Yu, Qi Sun, Hao Li, Zhi-Jun Qiao, Wei-Jie Li, Shu-Lei Chou, Zhi-Jia Zhang, Yong Jiang

Published in: Rare Metals | Issue 9/2023

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Abstract

Incorporating four cations into a single-phase oxide is beneficial for maintaining structural stability during Li+ insertion/desertion because of the produced entropy-dominated phase stabilization effects. However, medium-entropy oxides exhibit inherently poor electron and ion conductivity. As such, in this work, a single-phase medium-entropy oxide of NixCuyCozMn1–xyzO (named as NCCM@oxides(H2)) is prepared by modified-NiCuCoMn alloy through the epitaxial-growing-based self-combustion and hydrogen reduction. During hydrogen reduction, some Cu ions are reduced to elemental Cu (defined as Cu0), which is distributed among the metal oxides, while generating extensive oxygen vacancies around Cu. The synergetic effect between nanoporous metal-core oxide-shell structure and enriched oxygen/Cu0 vacancies greatly enhances the electronic/ionic conductivity. In addition, the lattice of single-phase quaternary metal oxides has the configuration entropy stability, which enables the rock-salt structure to remain stable during repeated conversion reactions. Benefiting from the above-mentioned merits, the anode for Li-ion batteries with entropy-stabled NCCM@oxides(H2) composite shows a high specific capacity of 699 mAh·g−1 at 0.1 A·g−1 and ultra-stable cycling stability, which maintains 618 and 489 mAh·g−1 at 0.1 and 1.0 A·g−1 after 200 cycles, respectively. This is the first use of this novel and simple strategy for modifying medium-entropy oxides, which paves the way for the development of high-entropy oxides as high-performance electrodes.

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Appendix
Available only for authorised users
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Metadata
Title
Tuning single-phase medium-entropy oxides derived from nanoporous NiCuCoMn alloy as a highly stable anode for Li-ion batteries
Authors
Zhen-Yang Yu
Qi Sun
Hao Li
Zhi-Jun Qiao
Wei-Jie Li
Shu-Lei Chou
Zhi-Jia Zhang
Yong Jiang
Publication date
13-07-2023
Publisher
Nonferrous Metals Society of China
Published in
Rare Metals / Issue 9/2023
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI
https://doi.org/10.1007/s12598-023-02293-1

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