纳米孔
材料科学
氧化物
合金
高熵合金
阳极
假电容
离子
组态熵
化学物理
动力学
化学工程
电极
热力学
电化学
纳米技术
化学
物理化学
冶金
超级电容器
物理
有机化学
工程类
量子力学
作者
Yanhao Wei,Yaohua Zhao,Yuefang Chen,Mengmeng Zhang,Zhenyu Zhang,Jianli Kang,Xiaoxuan Ma,Yong Jiang,Yifang Zhang
标识
DOI:10.1016/j.cej.2023.146881
摘要
High-entropy oxides (HEOs) are a novel class of promising anode materials for lithium-ion batteries, ascribing to their entropy-stabilized structure, regulable electronic structure, and high theoretical capacity. Nevertheless, there still lacks a systematic investigation into the function of HEO owing to the muddled arrangement of multiple elements. Moreover, a proper modification of the electrode microstructure is still needed to render better electrochemical performance. Herein, a nanoporous high-entropy alloy@high-entropy oxide (np-HEA@HEO) composite is synthesized, which possesses a job-sharing structure to separately store electrons and ions. The np-HEA-8@HEO sample with optimized particle size and interconnected mesopores exhibits the best Li storage performance. Lattice distortions and oxygen vacancies in the as-synthesized samples are detected, which are beneficial for rapid Li+ transport. The fast kinetics are verified to be contributed by a large portion of pseudocapacitance. DFT calculations demonstrate reduced d-p band energy difference and spin-dependent synergy of multi-cations in HEO, which can regulate the Li+ adsorption/desorption behavior and promote the reaction kinetics. Our results provide new insights into the features and properties of HEO in terms of Li storage characteristics.
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