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- W1964558336 abstract "The kinetics of the electrochemical lithium insertion reaction in nano-sized rutile TiO2 has been investigated using ac impedance spectroscopy. The experimental data are obtained for a rutile compound synthesized via a solution technique and characterized by a morphology corresponding to spherical particles made of a large number of very thin nanorods 20 nm thick. The results are discussed as a function of the Li content x for 0 < x ≤ 0.8 in LixTiO2, the temperature over the range 10–50 °C and the number of discharge–charge cycles. The significant linear decrease of the chemical diffusion coefficient DLi vs. the lithium content and the high values of DLi found in the composition range 0 < x ≤ 0.5 are discussed and related with the electrochemical behaviour of the nano-sized material. From comparison with the bulk material, a promoting effect of the morphology on the kinetic characteristics is evidenced. For the first time an experimental evaluation of the activation energy for Li diffusion in nano-sized rutile TiO2 is obtained; the value of 0.35 eV being much lower than that reported from computational experiments for the micro-sized oxide. This work also demonstrates a new system takes place from the second cycle, characterized by a significant improvement of Li diffusion by a factor five and allowing high rates to be used." @default.
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- W1964558336 date "2010-07-01" @default.
- W1964558336 modified "2023-10-09" @default.
- W1964558336 title "Investigation of lithium diffusion in nano-sized rutile TiO2 by impedance spectroscopy" @default.
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- W1964558336 doi "https://doi.org/10.1016/j.electacta.2010.03.101" @default.
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