X射线光电子能谱
阴极
插层(化学)
密度泛函理论
电解质
离子
电极
材料科学
化学工程
电池(电)
电流密度
纳米技术
化学
无机化学
物理化学
计算化学
有机化学
功率(物理)
工程类
物理
量子力学
作者
Zhongchen Zhao,Zhengqiang Hu,Qiang Li,Hongsen Li,Xiao Zhang,Yidan Zhuang,Feng Wang,Guihua Yu
出处
期刊:Nano Today
[Elsevier BV]
日期:2020-05-05
卷期号:32: 100870-100870
被引量:103
标识
DOI:10.1016/j.nantod.2020.100870
摘要
Owing to the high abundance, inherent safety, and three-electron redox properties of aluminum, aluminum-ion batteries (AIBs) are promising candidates for the next-generation battery technologies with high energy-to-price ratio. Despite recent great progress in finding appropriate electrolyte, an on-going research focus of the AIBs remains to be exploiting host electrodes for the large aluminum (complex) ions. Herein, a star-shaped two-dimensional (2D) WS2 microsheet assembly cathode substitute is prepared and applied in AIBs for the first time. The in-depth study with density functional theory (DFT) calculations, ex-situ X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) reveals an explicit intercalation mechanism of chloroaluminate anions (AlCl4−) in the WS2 electrode. Benefiting from their structural configuration, the star-shaped 2D WS2 microsheet assemblies display a highly reversible capacity of 254 mA h g−1 at a current density of 0.1 A g−1, a superior rate capability (86 mA h g−1 at 5 A g−1), and a favorable cycling stability (119 mA h g−1 remained after 500 cycles at 1 A g−1). The synthetic approach and the proposed mechanism could pave the way for the further development of high-performance AIBs.
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