材料科学
阳极
尖晶石
电解质
电化学
化学工程
锂(药物)
电极
氧化物
储能
纳米技术
冶金
热力学
化学
物理化学
医学
工程类
内分泌学
功率(物理)
物理
作者
Shisheng Hou,Lin Su,Shuai Wang,Yujie Cui,Jiaqi Cao,Huihua Min,Jingze Bao,Yanbin Shen,Qichong Zhang,Zhefei Sun,Zhu Chen,Jing Chen,Qiaobao Zhang,Feng Xu
标识
DOI:10.1002/adfm.202307923
摘要
Abstract Developing high‐capacity conversion‐type anodes with superior durability substituting conventional graphite anodes is urgently desired to improve the energy density of lithium‐ion batteries (LIBs). However, fatal capacity decay during cycling of the conversion‐type anodes, which is primarily due to their inevitable structural degradation and continuous solid‐electrolyte interphase reformation induced by drastic volume change, has highly restricted their commercialization. And, the interrelated effects of phase transformation, structural evolution, and electrochemical characteristics of the conversion‐type anodes during cycling remain poorly understood. Herein, the findings on the fabrication and understanding of a previously unexplored entropy‐stabilized spinel oxide, (Co 0.2 Mn 0.2 V 0.2 Fe 0.2 Zn 0.2 ) 3 O 4 as a promising conversion anode for LIBs, exhibiting not only moderate volume change character but also highly reversible capacities of ≈900 mAh g −1 for 500 cycles at 0.2 A g −1 and ≈500 mAh g −1 for 2000 cycles at 3 A g −1 , respectively, are reported. Evidenced by in situ transmission electron microscopy coupled with theoretical calculations, its underlying mechanism underpinning highly reversible Li storage is explicitly revealed, which originates from reversible phase transformation and domain reconstruction during cycling. Moreover, the origin of small volume change is also clearly clarified. This work provides renewed mechanistic insights into designing high‐capacity and durable conversion‐type electrode materials for high‐performance LIBs.
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