动能
钠
热力学
化学
化学工程
氧化物
熵(时间箭头)
材料科学
物理
有机化学
工程类
经典力学
作者
Xiong Wang,Qiaoling Kang,Jiaze Sun,Zhiyu Yang,Zhenchao Bai,Lijing Yan,Xianhe Meng,ChuBin Wan,Tingli Ma
标识
DOI:10.1016/j.jcis.2025.137438
摘要
O3-type layered oxides are considered promising cathode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity, but they often face issues with structural instability and poor sodium-ion diffusion, leading to rapid capacity fading. In this work, we introduce a high-entropy approach combined with synergistic multi-metal effects to address these limitations by enhancing both the structural stability and reaction kinetics. A novel O3-type layered high-entropy cathode material, Na0.9Fe0.258Co0.129Ni0.258Mn0.258Ti0.097O2 (TMO5), which was synthesized via a straightforward solid-phase method for easy mass production. Experimental analysis combined with in/ex-situ characterization verifies that high-entropy metal ion mixing contributes to the improved reversibility of the redox reaction and O3-P3-O3 phase transition behaviors, as well as the enhanced Na+ diffusivity. Benefit from the advantage of structure and composition, the TMO5 exhibits a higher initial specific capacity of 159.6 mAh g-1 and an impressive capacity retention of 85.6 % after 100 cycles at 2 C with the specific capacity of 110.1 mAh g-1. This work showcases high-entropy O3-type layered oxides as a promising pathway for achieving robust, high-performance SIB cathodes.
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