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

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

作者机构：School of Mechanical EngineeringTiangong UniversityTianjin300387China State Key Laboratory for Powder MetallurgyCentral South UniversityChangsha410083China School of Material Science and EngineeringTiangong UniversityTianjin300387China School of Electronic and Information EngineeringInstitute of Quantum Materials and DevicesTiangong UniversityTianjin300387China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2023年第42卷第9期

页      面：2982-2992页

核心收录：

学科分类：0808[工学-电气工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 52271011  52102291 and 51701142) 

主　　题：NiCuCoMn alloy Medium-entropy oxides Li-ion batteries Ultrahigh stability Mechanism 

摘      要：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 Ni_(x)Cu_(y)CozMn_(1-x-y-z)O(named as NCCM@oxides(H_(2))) 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 Cu^(0)),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/Cu^(0) 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 anodeforLi-ionbatterieswithentropy-stabled NCCM@oxides(H_(2)) 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.