ИСТИНА

Li-air batteries, which are highly promising electrochemical energy sources owing to their outstanding specific capacity, deals with various problems, such as cathode, mainly based on carbon materials, degradation during discharge-charge cycling. Thus, TiC is considered as an alternative material for Li-air battery positive electrode. It was shown that the solvents donor number (DN) could affects the capacities upon discharge, mainly by varying Li+-O2¯ solubility. It was mentioned, that depending on DN the Li+-O2¯ disproportionation mechanism follow either surface or solution way. However, there is no such data for TiC based positive electrodes or any data on correlation between TiC capacity and electrolyte used. Thus, it is possible to get some hints on electrolyte choice for cells with TiC cathode, studying electrode surface characteristics in different solvent based electrolytes. Solvent properties defines LiO2 lifetime and its probability to migrate from electrode further to electrolyte bulk. The migration length is higher for stronger solvation, that shifts the reaction zone far away from the interface and prevents electrode passivation. Thus, in lithium-oxygen cells TiC passivation rate depends on LiO2 life time that is related to solvents solvation properties