An isothermal, physics-based, dual lithium-ion insertion cell sandwich model was used for simulating the galvanostatic charge performance of a graphite (LixC6)/ liquid electrolyte/ Liy(NiaCobMnc)O2 cell at room temperature at various current densities .The cell capacity vs. voltage data from simulations were validated with experimental results. The cell overpotential was higher at higher rates. The cell was charged only to 67% and 57% of the designed capacity at 2C and 3C rates respectively due to corresponding overpotential losses of 279 and 414 mV. The various contributions to the cell overpotential at the end of 2C charge rate were obtained as in Figure 1. Solid phase diffusion limitation in the negative, charge transfer overpotential, electrolyte concentration overpotential and ohmic (ionic) overpotential influenced the charge acceptance for the cell design and operating conditions chosen in this work. Lithium plating at the negative electrode was shown to be thermodynamically feasible during galvanostatic charging at 2C rate and above (Figure 2). References: . R. Chandrasekaran, J. Power Sources, 271, 2014, 622-632.

Fast charging of dual lithium-ion-insertion cells

249th National Meeting (2015)

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