动力学
材料科学
异质结
离子
电池(电)
化学工程
光电子学
化学
热力学
物理
功率(物理)
有机化学
量子力学
工程类
作者
Huanyu Liang,Chunliu Zhu,Weiqian Tian,Chunyan Zhu,Yue Ma,Wei Hu,Jingyi Wu,Jingwei Chen,Rutao Wang,Minghua Huang,Yue Zhu,Huanlei Wang
出处
期刊:Small
[Wiley]
日期:2024-04-26
标识
DOI:10.1002/smll.202400767
摘要
Abstract Fluorides are viewed as promising conversion‐type Li‐ion battery cathodes to meet the desired high energy density. FeOF is a typical member of conversion‐type fluorides, but its major drawback is sluggish kinetics upon deep discharge. Herein, a heterostructured FeOF‐MXene composite (FeOF‐MX) is demonstrated to overcome this limitation. The rationally designed FeOF‐MX electrode features a microsphere morphology consisting of closely packed FeOF nanoparticles, providing fast transport pathways for lithium ions while a continuous wrapping network of MXene nanosheets ensures unobstructed electron transport, thus enabling high‐rate lithium storage with enhanced pseudocapacitive contribution. In/ex situ characterization techniques and theoretical calculations, both reveal that the lithium storage mechanism in FeOF arises from a hybrid intercalation‐conversion process, and strong interfacial interactions between FeOF and MXene promote Li‐ion adsorption and migration. Remarkably, through demarcating the conversion‐type reaction with a controlled potential window, a symmetric full battery with prelithiated FeOF‐MX as both cathode and anode is fabricated, achieving a high energy density of 185.5 Wh kg −1 and impressive capacity retention of 88.9% after 3000 cycles at 1 A g −1 . This work showcases an effective route toward high‐performance MXene engineered fluoride‐based electrodes and provides new insights into constructing symmetric batteries yet with high‐energy/power densities.
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