Design optimization of spinel-rocksalt intergrown high entropy oxide structure for enhanced electrochemical properties

• Published in: Journal of alloys and compounds 2023-12, Vol.968, p.172135, Article 172135
• Main Authors: Yang, Hengming, He, Linxin, Yang, Zhaoming, Chen, Qingchun, Jiang, Guoquan, Zhu, Junchao, Xue, Rui, Qiu, Nan, Wang, Yuan
• Format: Article
• Language: English
• Subjects: Electrochemical-properties; High entropy oxides; Intergrown structure; Spinel-rocksalt
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.172135

The advantages of each phase can be utilized to prepare a dual-phase intergrown anode consisting of spinel (Fd-3m) and rocksalt (Fm-3m) phases through the solid-state method. This approach leverages the high redox activity and lithium storage capacity of the rocksalt phase, as well as the good kinetics and stability of the spinel structure. By adjusting the sintering temperature, the ratio of the spinel phase (S-HEO) to the rocksalt phase (R-HEO) in the novel intergrown high entropy oxide structure (d-HEO) can be modulated, allowing for control over its electrochemical properties. Through this, an optimized S-HEO/R-HEO ratio can be achieved, resulting in high capacity coupled with desired cyclic stability and rate performance. This work demonstrates an effective strategy for constructing spinel-rocksalt intergrown structures. Furthermore, optimizing the structural properties of the dual-phase may shed light on material design for electrochemical energy storage and new applications of advanced HEOs. •High entropy oxides with the spinel-rocksalt intergrown structure are successfully synthesized and explored as anode materials for Li-ion batteries.•The formation mechanism of the intergrown structure is explored.•A synergistic effect of desired kinetics from spinel and high capacity from the rocksalt phase is achieved.