Electrochimica Acta, Vol.55, No.17, 4952-4959, 2010
Investigation of lithium diffusion in nano-sized rutile TiO2 by impedance spectroscopy
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 degrees C and the number of discharge-charge cycles. The significant linear decrease of the chemical diffusion coefficient D-Li vs. the lithium content and the high values of Du found in the composition range 0