A complete cell model composed of a two-layered positive electrode with single-sized particles in each layer was presented to describe the effects of volume fraction of two particles distributed in the positive electrode and thickness of two layers on the Li-ion cell performance during discharge. It was determined that for such positive electrode, the volume fraction of particles near the separator should be less than the volume fraction of particles adjacent to the current collector, disregarding the particle size. In this situation, more Li-ions reach the particles surface at the back of the electrode (near the current collector) and the Li intercalation reaction proceeds more effectively. One objective of this work was to determine the optimized volume fraction of particles to obtain the lowest total polarization in the cell and the highest voltage with positive electrodes containing two layers of the same thickness. The analysis also showed that the lowest total cell polarization was achieved by increasing the thickness of the layer composed of the smaller particles in the range of a = 1.5 to a = 2, where a is the ratio of the total thickness of the positive electrode to the thickness of the layer composed of the smaller particles. (C) 2019 The Electrochemical Society.