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Journal of the Electrochemical Society, Vol.159, No.6, A739-A751, 2012
The Effect of Additives upon the Performance of MCMB/LiNixCo1-xO2 Li-Ion Cells Containing Methyl Butyrate-Based Wide Operating Temperature Range Electrolytes
The effect of additives upon the ability of meso-carbon microbead (MCMB) carbon/LiNixCo1-xO2 lithium-ion cells containing methyl butyrate-based electrolytes to provide operation over a wide temperature range (-60 to + 60 degrees C) was investigated. A number of electrolyte additives were studied, including mono-fluoroethylene carbonate (FEC), lithium oxalate, vinylene carbonate (VC), and lithium bis(oxalato borate) (LiBOB). The intent of incorporating these additives into methyl butyrate-based electrolytes is to widen the operating temperature range of these systems, especially at warm temperatures. A number of formulations were investigated in experimental three-electrode MCMB/LixNiyCo1-yO2 lithium-ion cells, based on an electrolyte that has previously been demonstrated to provide good low temperature performance (to -60 degrees C), namely 1.00M LiPF6 in ethylene carbonate (EC) + ethyl methyl carbonate (EMC) + methyl butyrate (MB) (20:20:60 v/v%). In addition to studying the charge and discharge behavior of the cells, a number of electrochemical techniques were also employed, including Electrochemical Impedance Spectroscopy (EIS), Tafel polarization and linear polarization to understand the interfacial effects on the intercalation kinetics. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.058206jes] All rights reserved.