With the goal of creating a model of a Li-air battery that is consistent with voltammetry data, we develop a full battery model capable of giving insight into details of cell operation otherwise inaccessible to common experimental techniques. With this model, we investigate the dependence of the current on: the diffusion characteristics of the electrolyte, the solubility of the ambient oxygen, the structure of the cathode, and aspects of the primary surface reaction. We explore modifications to a basic reaction-diffusion model of a full cell that bring better agreement with experimental data, including gas-electrolyte surface limited diffusion and a partially active cathode. We discuss how the basic form of the model and the simulated reaction and concentration profiles affect cell dynamics. Non-aqueous Li-air/Li-O 2 batteries have the highest theoretical energy density of any existing battery technology, 1-3 yet the practical application of these systems is hampered by electrolyte-related phenomena including material degradation and mass transport limited behavior. Ideally, electrolytes for Li-air batteries should exhibit high ionic conductivity, resistance to decomposition, high oxygen solubility and fast oxygen diffusion rates. While many groups have focused on the degradation aspects and a few groups have investigated oxygen mass transport as a function of electrolyte chemistry, 4-8 fewer have deeply explored the impact of oxygen diffusion on cell performance (see Ref. 9 for a recent review of Li-air models). Here we use a computational approach with experimental validation to model a full Li-air battery under transport-limited conditions and extract the influence of reaction-diffusion parameters.In designing Li-air battery systems voltammetry experiments play an important role in providing estimates of the reaction-diffusion properties which influence power density, energy density and cell lifetime. Voltammetry, a category of electroanalytic methods in which potential is varied linearly with time, has become a standard experimental tool to discern thermodynamics, kinetics and transport related to electrochemical processes. Randles and Sevcik derived a widely-used voltammetric correlation in which the peak current is proportional to the square root of the voltage scan rate for a reversible reaction at a flat electrode surface, 10-12 which was subsequently modified for semiirreversible electrochemical processes (e.g. oxygen reduction in Li-air batteries) by Delahay, 13,14 and Nicholson and Shain. 15,16 Despite the ability to estimate the diffusion coefficient with a simple algebraic equation, these semi-empirical correlations are inappropriate for application in devices with complex (i.e. porous) electrode geometries, as in Li-air batteries.Modeling electrochemical processes under practical device conditions, such as in a coin cell, provides insight into phenomena not easily accessible by experimentation. Generally speaking, a number of physical mechanisms are important in a complete battery model such as th...