New spinel high-entropy oxides (FeCoNiCrMnXLi)3O4 (X = Cu, Mg, Zn) as the anode material for lithium-ion batteries
New spinel high-entropy oxides (FeCoNiCrMnXLi)3O4 (X = Cu, Mg, Zn) as the anode material for lithium-ion batteries
复制标题
新型尖晶石高熵氧化物(FeCoNiCrMnXLi)(3)O-4(X=Cu、Mg、Zn)作为锂离子电池负极材料
DOI：
10.1016/j.ceramint.2021.08.091
复制
发表时间：
2021-09-28
影响因子：
5.2
通讯作者：
Liu, Yanguo
中科院分区：
文献类型：
--
作者：
Duan, ChanQin;Tian, Kanghui;Liu, Yanguo
高熵氧化物（HEO）具有高结构稳定性和超离子导电性等众多功能特性，被认为是锂离子电池（LIB）电极材料的有希望的候选者。本研究采用固相法合成了一系列由等摩尔比的七种金属元素组成的单相尖晶石结构高熵氧化物(FeCoNiCrMnXLi)(3)O-4(X=Cu、Mg、Zn)。采用原位高温 XRD 技术研究了 (FeCoNiCrMnZnLi)(3)O-4 的结构演化，并在 900 ℃ 下获得了单相 HEO。作为锂离子电池的阳极，所有 HEO (FeCoNiCrMnXLi)(3)O-4 由于尖晶石的三维 Li+ 传输路径加快而表现出优异的循环稳定性和倍率性能 结构、熵主导的相稳定效应以及通过掺入Li+引入的丰富的氧空位。相比之下，含有四面体配位结构电化学活性Zn的(FeCoNiCrMnZnLi)(3)O-4负极在三个样品中表现出更好的电化学储锂性能。 (FeCoNiCrMnZnLi)(3)O-4 在放电/充电过程中的异位 XRD 显示出第一次锂化过程后的非晶态结构，并在脱锂过程中保留。这项工作为设计高熵储能材料提供了新策略，并为理解 HEO 的存储机制铺平了道路。
High-entropy oxides (HEOs) with numerous functional features such as high structure stability and superionic conductivity are considered as promising candidates of electrode materials for lithium-ion batteries (LIBs). In this study, a series of single-phase spinel-structured high-entropy oxides (FeCoNiCrMnXLi)(3)O-4 (X = Cu, Mg, Zn) consisted of seven metal elements at equal molar ratio were synthesized by solid phase method. In-situ high-temperature XRD technique was used to investigate the structure evolution of (FeCoNiCrMnZnLi)(3)O-4 and a single-phase HEO was acquired at 900 degrees C. As the anode of LIBs, all the HEOs (FeCoNiCrMnXLi)(3)O-4 display excellent cyclic stability and rate capability owe to the expedite three-dimensional Li+ transport pathways of spinel structure, the entropy-dominated phase stabilization effect together with the abundant oxygen vacancies introduced by the incorporation of Li+. In comparison, the (FeCoNiCrMnZnLi)(3)O-4 anode containing electrochemical active Zn with tetrahedral coordination structure shows better electrochemical lithium storage performances among the three samples. The ex-situ XRD of (FeCoNiCrMnZnLi)(3)O-4 during the discharge/charge procedure shows an amorphous state structure after the first lithiation process and it retained for the de-lithiation process. This work provides a new strategy to design high-entropy energy-storage material and pave the way for understanding the storage mechanism of HEOs.