Journal
NANO TODAY
Volume 32, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2020.100870
Keywords
Star-shaped 2H-WS2; Aluminum-ion batteries; DFT calculations; Insertion mechanism
Categories
Funding
- National Natural Science Foundation of China [51804173]
- Shandong Provincial Natural Science Foundation [ZR2018BB030]
- Qingdao Science and Technology Plan Applied Basic Research [18-2-2-22-jch]
- Welch Foundation [F-1861]
- Sloan Research Fellowship
- Camille Dreyfus Teacher-Scholar Award
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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 mAh 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. (C) 2020 Elsevier Ltd. All rights reserved.
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