ИСТИНА

The growing number of studies on the cathode materials with high-voltage discharge profiles made the redox stability of Li-ion electrolytes one of its most important properties. High-concentrated electrolytes may be very perspective from this viewpoint. Despite the fact that an increasing salt concentration (compared to the standard - 1 mol/l) leads to a decreasing ionic conductivity and increasing viscosity (both factors are negative), various unusual functional properties was recently discovered for this class of electrolytes. The main reason of such unusual properties is the “structure” of the solution where the most of free solvent molecules are eliminated. With increasing concentration, Li salts tend to be more associated to form contact ion pairs and aggregates rather than solvent-separated ion pairs. At the moment only cathodic stability (on the anode side – metallic Li or graphite) of high-concentrated electrolytes was studied. The aim of the present work is the study of anodic (high-voltage) properties of the liquid electrolytes with different salt concentration and research of their redox stability with high-voltage cathode materials such as LiNi0.5Mn1.5O4 or LiCoPO4.