结晶度
阳极
尖晶石
材料科学
退火(玻璃)
化学工程
氧化物
粒径
电化学
电极
锂离子电池
纳米颗粒
纳米技术
冶金
电池(电)
复合材料
化学
物理化学
工程类
功率(物理)
物理
量子力学
作者
Thi Xuyen Nguyen,Chia Chien Tsai,Jagabandhu Patra,Oliver Clemens,Jeng Kuei Chang,Jyh Ming Ting
标识
DOI:10.1016/j.cej.2021.132658
摘要
Co-free high entropy spinel oxide (HESO) with all metals being active for use as anode in Li-ion battery (LIB) is demonstrated for the first time. The HESO, (CrMnFeNiCu)3O4, was synthesized via a simple and scalable hydrothermal method followed by post annealing at temperatures ranging from 800 to 1000 °C. The post annealing provides a simple way to control the particle size and crystallinity. As a result, the missing link between the anode performance and the critical factors of particle size and crystallinity/phase is reported for Co-free high entropy oxide. The HESO anode with balanced crystallinity and particle size displays optimized electrochemical performance. It shows excellent cycling stability (∼99%) after 250 cycles and the excellent rate capability. The structure evolution during cycling was examined using in operando XRD, indicating the existence of nano-crystalline structure after the lithiation/delithiation reactions. This feature is favorable for enhancing electrode cyclability. This study thus opens a new window of opportunity for the development of next-generation LIB electrode materials.
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