Abstract

Lithium difluoro(oxalato)borate (LiDFOB) and lithium bis(oxalato)borate (LiBOB) have emerged as superior additives for the formation of favorable passivation layers on active electrodes. In this study, we systematically investigate the thermal phase behavior and electrochemical/physicochemical properties of LiBF4, LiDFOB and LiBOB mixtures with the cyclic carbonate ethylene carbonate (EC) and ester γ-butyrolactone (GBL). Raman spectroscopy was used to determine the degree of solvation that is present in the liquid electrolytes, which may then be directly correlated to the bulk conductivity of the mixtures.

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