Properties of PC-EA solvent and its solution of LiBOB comparison of linear esters to linear carbonates for use in lithium batteries

A binary solvent of propylene carbonate (PC) and ethyl acetate (EA) was measured for its liquid phase boundaries made of bubble point and liquidus lines, its glass transition temperature (T-g) for the evaluation of its viscosity, and its dielectric constant. Its solution of lithium bis(oxalato)borate (LiBOB) was measured for its T-g and its electrolytic conductivity. The results were compared with their counterparts in a binary solvent of PC-diethyl carbonate (DEC) and its solution of LiBOB obtained in previous studies. The advantages and disadvantages in general of using linear esters in the place of linear carbonates for lithium battery electrolytes are discussed based on the results of this study and on the literature values of properties of the PC-EA and PC-DEC solvents. © 2005 The Electrochemical Society. [DOI: 10.1149/1.1914757] All rights reserved.