OCV measurements, cyclic voltammetry and chrono-amperometric measurements have been performed to provide information on the type of mechanism of Li insertion into Li₄Ti₅O₁₂ spinel material. Step-wise potentiodynamic electrochemical techniques allow us to distinguish between a single-phase versus two-phase reaction and to conclude on the type of growing mechanism (nucleation-and-growth or homogeneous growth) and the evolution upon cycling.

Keywords: Li₄Ti₅O₁₂; Li insertion; insertion mechanism; chrono-amperometry.