کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6470171 | 1424104 | 2017 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Electrochemical kinetics of Li insertion in nanosized high performance V2O5 obtained via fluorine chemistry Electrochemical kinetics of Li insertion in nanosized high performance V2O5 obtained via fluorine chemistry](/preview/png/6470171.png)
The kinetics of the electrochemical lithium insertion reaction in nanosized V2O5 prepared from a fluorination synthesis in solution is investigated by AC impedance spectroscopy. The experimental data are obtained vs. x in nano-LixV2O5 over the wide composition range 0 â¤Â x < 1.8 and vs. temperature. Kinetic parameters for Li electroinsertion in nanosized V2O5 are achieved here for the first time. The charge transfer kinetics is little affected by Li content. A moderate evolution of the chemical diffusion coefficient is related to the peculiar single-phase behavior induced by the nanosize effect combined with shorter Li diffusion pathways. Comparison with experimental data obtained for microsized analogue vs. temperature reveals a much lower activation energy barrier (0.06 eV) for the lithium diffusion process in nanosized V2O5 that explains the significant improvement in electrochemical performances and especially a better rate capability. This work illustrates how nanosizing promotes the kinetics of Li insertion reaction, in agreement with the new and specific structural response of nanosized vanadium pentoxide.
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Journal: Electrochimica Acta - Volume 253, 1 November 2017, Pages 472-478