THERMOCHEMICAL INVESTIGATIONS OF THE SYSTEMS USEFUL FOR LITHIUM BATTERY CONSTRUCTION .2. SOLUTION ENTHALPIES OF LICLO4 IN 1,2-DIMETHOXYETHANE PLUS GAMMA-BUTYROLACTONE MIXTURES AND OF LICLO4, NAI AND N,N-DIMETHYLACETAMIDE IN 1,2-DIMETHOXYETHANE PLUS PROPYLENE CARBONATE MIXTURES AT 298.15 K

Solution enthalpies of LiClO4 in 1,2-dimethoxyethane + gamma-butyrolac tone (1,2-DME + gamma BL) mixtures and of LiClO4, NaI and N,N-dimethyl acetamide in 1,2-DME + propylene carbonate (PC) mixtures have been mea sured. The molar enthalpies of solution, Delta(sol)H(m) of the examine d electrolytes as a function of the mixed solvent composition exhibit a distinct minimum within the range of high 1,2-DME content, similar t o those observed earlier for LiBF4 and LiPF6 solutions in 1,2-DME + ga mma-BL mixtures while the dissolution enthalpy of DMA runs monotonousl y within the same range of the mixed solvent compositions. The presenc e of the Delta(sol)H(m) minimum of the salts is explained as a resulta nt of energetic effects of interactions in the solution, connected wit h the ionic association of the salt, the 1,2-DME + cation complex form ation and changes in a composition of the ionic solvation shells