The ionic and electronic charge carrier distribution is discussed for various interfaces of interest in batteries (electrode/electrolyte; electrode/passivation layer; solid electrolyte grain boundaries in multiphase electrodes). Such modified carrier concentrations are of significant influence on charge transport (conductivity) and transfer (transfer resistance) and indirectly for the storage behavior. However, space charge zones can be of great significance for the storage directly. The extreme case is met if the abrupt contact of two phases allows for storing Li or Na in a job-sharing way even if none of the two phases allow for storage themselves. This is relevant the more so since this storage can be extremely fast. Thermodynamics and kinetics of this storage mode are set out in greater detail [1-4].
 L. J. Fu, C. C. Chen, D. Samuelis, and J. Maier, Phys. Rev. Lett. 2014, 112, 208301(1-5).
 C.-C. Chen, L.-J. Fu, and J. Maier, Nature, 2016, 536, 159-164.
 C.-C. Chen and J. Maier, Phys. Chem. Chem. Phys., 2017, 19, 6379-6396
 C.-C. Chen, E. Navickas, J. Fleig, and J. Maier, Adv. Funct. Mater., 2017, submitted.