In situ forming of ternary metal fluoride thin films with excellent Li storage performance by pulsed laser deposition
| Autor: | Kaiyuan Wei, Ling Xu, Yanhua Cui, Xiaojiang Liu, Jian Li, Shiping Ma, Yu Zhao |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Chemical Engineering General Engineering General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode Lithium-ion battery 0104 chemical sciences law.invention Pulsed laser deposition chemistry.chemical_compound X-ray photoelectron spectroscopy Electron diffraction chemistry Chemical engineering law General Materials Science Thin film 0210 nano-technology Ternary operation Fluoride |
| Zdroj: | Ionics. 26:3367-3375 |
| ISSN: | 1862-0760 0947-7047 |
| Popis: | In the field of lithium ion battery, conversion-based metal fluoride cathodes are attractive for their excellent theoretical capacity and high voltage. However, the utilization of binary metal fluorides is severely hindered by irreversibility and large voltage hysteresis. The introduction of ternary metal fluorides, like AgCuF3 and CuxFe1-xF2, brings hope to address these shortcomings. To better understand the basic mechanism of conversion reaction in ternary metal fluoride cathodes, the Cu–Fe–F (CFF) thin films were successfully grown in situ by pulsed laser deposition in this work. The physico-chemical properties and electrochemical performance were discussed. Such a CFF solid solution phase presented great cycle stability (82% capacity remains after 100 cycles at current density of 285 mA g−1) and higher energy efficiency (71.8%), which can be attributed to the reversible structural rearrangement after the delithiation process disclosed by ex situ XPS, high-resolution TEM, and selected-area electron diffraction. |
| Databáze: | OpenAIRE |
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