(Invited) Mass Transport and Storage in Li-Ion Electrodes: Bulk and Interfaces

Abstract

The subject of batteries is the interconversion of compositional changes and outer electrical potential changes. In solids all compositional changes refer explicitly to defect chemistry. Point defects such as interstitial and vacancies enable ion transport, mass transport and represent the species affected by storage [1].The contribution discusses the modes of storage (bulk and interfacial storage) [2], derives the respective theoretical charge/discharge curves and discusses transport kinetics. The latter follow from the defect chemical picture, too. As for storage (chemical capacitance) also for transport (chemical resistance) one may distinguish between bulk and boundary phenomena [3]. The defect-chemical description is shown not only to be the adequate description (superior to, e.g. lattice gas models), it also leads to a generalized picture of electrode and supercapacitive storage.