کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6470171 1424104 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical kinetics of Li insertion in nanosized high performance V2O5 obtained via fluorine chemistry
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical kinetics of Li insertion in nanosized high performance V2O5 obtained via fluorine chemistry
چکیده انگلیسی

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 ≤ 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.

180

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 253, 1 November 2017, Pages 472-478
نویسندگان
, , , , , ,