Electrochemical Impedance Spectroscopy (EIS) can be used to study lithium ion batteries.  Half cells were constructed using five different cathodes:  lithium nickel manganese cobalt oxide (NMC), lithium manganese oxide (LMO), and mixtures of 3:1, 1:1, and 1:3 NMC:LMO.  After formation, EIS data was collected at 0%, 50%, and 100% state of charge.  An equivalent circuit model will be developed and values for resistance and capacitance for the equivalent circuit will be calculated.  The values will be compared for pure NMC, pure LMO, and the cathode material blends.  We want to determine if the impedance of the blends is a weighted average of NMC and LMO content, or if one of the cathode materials dominates the impedance of the blends.

Modeling of lithium ion battery cells to fit electrochemical impedance spectroscopic data

246th National Meeting (2013)

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