Abstract
Solvation states of single solvent electrolyte systems of ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), ehylmethyl carbonate (EMC) and diethyl carbonate (DEC) with LiPF 6 were characterized by 13C-NMR solvation shift and molecular orbital (MO) simulation. Dissociation constants and solvation constants were estimated by parameter fitting to solvation shift using a simple equilibrium model. The solvation shifts Δδ were observed not only at a lower field but also at a higher field due to change of net charge Δ ρ in solvent molecules by Li + attachment. This particular feature of solvation shifts was demonstrated in the molecular orbital simulation as driven by the change of net charge using a 1:1 (Li +:solvent) solvation model.
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