Relationship between tin environment of SnO2 nanoparticles and their electrochemical behaviour in a lithium ion battery
نویسندگان
چکیده
SnO2 nanoparticles were synthetized in three different ways (solvothermal, hydrothermal, sol-gel) and heat-treated under argon at 600 °C to obtain physico-chemical characteristics (texture, structure surface chemistry) determined by X-ray powder diffraction (XRD), infrared spectroscopy (FTIR), 119Sn solid state Nuclear Magnetic Resonance (NMR), Electron Spin (ESR), scanning electron microscopy (SEM) 77 K nitrogen sorption. When used as electrode material a lithium ion battery, their electrochemical properties evaluated galvanostatic measurements. Among crystallinity, particle size, specific area associated porosity, hydroxyl groups paramagnetic centers, only the last two parameters appear determinants of performance. Solvothermal hydrothermal syntheses lead presence certain oxide whereas sol-gel one prevents formation but forms species. The favour good coulombic efficiency an interesting reversibility conversion process. Paramagnetic species limit Their elimination heat-treatment 1000 improves properties. Understanding key factors SnO2-based materials allows capacities about 900 mAh.g−1 over 5 cycles.
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ژورنال
عنوان ژورنال: Materials Chemistry and Physics
سال: 2021
ISSN: ['0254-0584', '1879-3312']
DOI: https://doi.org/10.1016/j.matchemphys.2020.123461