where N Li is the number of Li + and the angle brackets denote an average over time-origins. The self-diffusion coefficient, D * , is related to the long-time slope of the MSD by the Einstein relation where d is the dimensionality of the system. All diffusion analysis was performed using KINISI, which uses Bayesian linear regression to estimate D * via Markovchain Monte Carlo (MCMC) sampling of linear models, m = 2dD * ∆t + c, that are consistent with the observed simulation data . The temperature dependence of D * was modelled using the exponential form of the Arrhenius expression