Sichka M. Physicochemical properties of cathode material for lithium power sources based on magnesium fluoride

This dissertation focuses on the complex study of physicochemical properties of cathode material for lithium power sources based on ultradispersed magnesium fluoride. It has been determined that chemical deposition makes it possible to obtain ultradispersed powder of magnesium fluoride with highly developed specific surface. It has been proved by experiment that elechtochemical intercalation of lithium ions into the rutile structure of magnesium fluoride is a two-phase process when cavities of surface layer structural channels accumulated on lithium metal surfaced are initially filled and free "guest" positions in the space of the cathode matrix structure are subsequently filled by lithium diffusion. The kinetics of changing the coefficient of lithium diffusion into MgF2 structure has been studied. It has been determined that in the process of accumulating lithium intercalated by seleit matrix with the rutile structure, the diffusion coefficient changes in a non-monotone way depending on the established cathode-anode difference in potentials while its total reduction is observed. For the first time, it has been shown the possibility of effective scraping of electrochemical cells with cathodes based on ultradispersed magnesium fluoride while preserving high specific characteristics of a source.