The kinetics of Li-ion intercalation/alloying into Cu6Sn5 electrode was determined by potentiostatic intermittent titration technique (PITT) and electrochemical impedance spectroscopy (EIS) method. Although the Li-ion diffusion coefficient (D-Li) values are relatively high (from 10(-11) to 10(-10) cm(2)/s) in the most voltage range, two minima (below 10(-11) cm(2)/s) in the D-Li vs. voltage curve were observed at similar to 0.4 and 0.1 V, coinciding with the voltage plateau in the charge/discharge curves, indicating reversible structural phase transition or order/disorder transition in the compound. The D-Li derived from PITT and EIS were confirmed well both in the magnitudes and in the variation within Li composition (voltage) range. (C) 2008 Elsevier B.V. All rights reserved.