Lithium ion conductors and concomitantly the topic of Li solid state diffusion have become enormously popular in recent years. This is mainly due to
the quest for better materials and performances of Li ion batteries, the leading electrochemical energy storage system. However, fundamental research on diffusion of the lightest ion besides H+, comprising questions about, e.g., the dimensionality of diffusion or the influence of structural disorder, has been
intensified as well. Here, exemplary results of our group in the field of diffusion fundamentals are reviewed. Methodologically, the investigations extensively
involve NMR techniques, but also impedance spectroscopy, mass spectrometry and neutron scattering are being applied.
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