Chemical diffusion was measured by using the current-pulse relaxation technique at room temperature. It was found that the diffusion coefficients for Mn2LiO4 were between 10-9 and 10-10cm2/s, while those for the substituted compounds were at least an order of magnitude higher. An order-disorder phase transition, which occurred in approximately 50%-substituted materials, appeared to accelerate Li diffusion in the spinel structure.

M.Wakihara, G.Li, H.Ikuta, T.Uchida: Solid State Ionics, 1996, 86-88[2], 907-9