Density and electrical conductivity of LiClO4, LiBF4 and LiPF6 solutions in mixes diethyl carbonate – propylene carbonate

The method of a densimetry and conductometry was study of physico-chemical properties of triple systems LiX–DEC – PC in an interval 10-50°C with salt concentrate 0,1-2,25 M (where X-ClO4, BF6, PF6; a ratio of weights of solvents changed 25:75, 50:50, 75:25 mas.% accordingly). In a double system diethyl carbonate (DEC) – propylene carbonate (PC) was found formation of an intermolecular associate of a structure 1:1. Density electrolyte of solutions linearly varies both with increase of concentration of salt, and with temperature rise. The concentration dependence of electrical conductivity (ae) has extreme nature. The maximum is in the field of salt content 0,75-1,25 M depending on a structure of a binary solvent. The temperature coefficient of electrical conductivity for all salts a little bit increases in process of increase of the contents of the PC. At any concentration and temperature, the salt can be arrange according to their conductivity: PF6, > ClO4 > > BF2.