High-Entropy Configuration Strategy to Build High Performance Na-Ion Layered Oxide Cathodes Derived from Simple Techniques
Xiangnan Li, Xinyu Tang, Ming Ge, Mengdan Zhang, Wenfeng Liu, Xiaojian Liu, Yuantao Cui, Huishuang Zhang, Yanhong Yin, Shuting Yang
Abstract
High Resolution Image Download MS PowerPoint Slide Layered transition metal oxides are commonly used as the cathode materials in sodium-ion batteries due to their low cost and easy manufacturing. However, the application is hindered by poor rate performance and complex phase transitions. To address these challenges, a new seven-component high-entropy layered oxide cathode material, O3-NaNi 0.25 Fe 0.15 Mn 0.3 Ti 0.1 Sn 0.05 Co 0.05 Li 0.1 O 2 (HEO) has been developed. The entropy stabilization effect plays a crucial role in improving the performance of electrochemical systems and the stability of structures. The HEO exhibits a specific discharge capacity of 154.1 mA h g –1 at 0.1 C and 94.5 mA h g –1 at 7 C. In-situ and ex-situ XRD results demonstrate that the HEO effectively retards complex phase transitions. This work provides a high-entropy design for the storage materials with a high energy density. Meanwhile, it eliminates industry doubts about the performance of sodium ion layered oxide cathode materials.