Physics-based models of the Li-ion battery promise to aid in deciphering and quantifying electrode limitations, thereby providing valuable insights for choosing the optimal electrode design for a specific application. However, to obtain relevant results from the models, a reliable set of input parameters is required. This work presents a combined experimental/modeling approach relying on the Newman pseudo-2D model for a complete characterization of a set of LiNi0.5Mn0.3Co0.2O2 electrodes. Intrinsic properties of the active materials are determined and validated using low loading electrodes having negligible porous-electrode limitations. Then, high-energy-density electrode properties are characterized using appropriate experimental methods, which are widely reported in the literature. In a second part of this series of papers, parameters obtained from this part serve as input parameters in Newman pseudo-2D model as well as in an extension of Newman model in order to simulate the rate capability during discharge of the aforementioned set of high-energy-density electrodes.