Liquid electrolytes have gained a lot of traction in design and development of lithium ion batteries (LIBs) for electric vehicles over the last decades. Understanding the design of complex electrolytes has been studied widely in both simulations and experiments. The requirements for electrolytes for LiBs are manifold: First, suitable formulations should be electrochemically stable, at least in a kinetic sense, implying that stable passivation layers such as the Solid Electrolyte Interphase (SEI) are readily formed. Second, the lithium ions in the electrolyte should be sufficiently mobile, which is especially important for fast charging and discharging. Finally, due to ecological, economical and safety reasons, the electrolyte should be environmentally benign, cost effective and have a low flammability and toxicity. While as of today not all criteria have been fully met, a good compromise can be achieved by blending various solvents and additives, although the individual constituents may vary strongly depending on the employed battery chemistry. Liquid electrolytes offer higher conductivity, nonetheless they are known to be somewhat flammable. While it is necessary to improve the safety, it is also important to understand the mechanism behind higher conductivity. In commercial LiBs, mixtures of cyclic carbonates, like propylene carbonate (PC) or ethylene carbonate (EC), and linear carbonates, such as dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), have become the state of the art, although other compounds have been utilized as well. Despite decades of intense research, even the ion transport properties of liquid carbonate electrolytes in the bulk are not fully resolved, let alone their interfacial properties relevant for the SEI formation. Predicting interfacial properties from bulk properties is hard, so the formation and growth of SEI layer is in itself a broad topic to study. However composition of electrolytes play a crucial role in both interfacial and bulk properties. Several studies already focused on an exhaustive characterization of the dependence of the electrolyte properties (e.g. bulk conductivity) on the composition. High-throughput experimentation approaches can be leveraged to navigate through composition space, which furthermore offers the advantage that robotic platforms provide highly standardized data. In many of these studies, the conductivity of the electrolytes was related to other macroscopic observables -e.g. viscosity or permittivity -on a phenomenological level. That is, although the composition dependence observed experimentally can be captured by empirical descriptions, the underlying microscopic origins often remain elusive. Here, Molecular dynamics (MD) simulations provide insights on atomic and molecular scales, and hence in principle offer an efficient pathway for design and understanding of complex electrolytes. Currently, empirical potentials or so-called force fields are predominantly used to model the atomic interactions due to the fact that ab initio methods are often computationally too demanding and novel machine-learning techniques have not yet reached their full maturity. Therefore, the accuracy of the predicted properties strongly depends on the quality of the force field, which partly account for explicit molecular polarization. The latter is particularly relevant because ions within an electrolyte polarize their local environment, which is espe-cially pronounced for small ions with high charge densities such as lithium ions. Perhaps the most obvious discrepancy between non-polarizable and polarizable force fields is that the former tend to predict electrolyte transport properties that are too low as compared to experiments, while the latter usually yield fairly good agreement. Further details about various polarization models are discussed in a recent review. Indeed, force fields specifically parameterized for liquid carbonate electrolytes provided important insights into the structure and dynamics. Generally, the lithium ions display a mixed coordination shell composed of the employed solvent species and anions, in which cyclic carbonates such as EC coordinate preferentially as compared to their linear analogues (e.g. DMC or EMC), mainly due to differences in their respective dipole moments. Furthermore, it was observed that the formation of ion pairs increases with the fraction of the linear carbonate(s). In agreement with experimental data, the diffusivity of solvent molecules and ions is generally found to be larger for high fractions of linear carbonate, which is ascribed to the reduced viscosity. For the collective charge transport, however, measured by the conductivity, higher EC or PC fractions are usually beneficial due to a reduction of ion pairing. On a local level, a recent analysis showed that the lithium ion transport in liquid carbonate electrolytes mainly occurs in a vehicular manner, i.e., the lithium ions move cooperatively with their coordination environment. Although insights of such detailed analysis are very valuable, it currently only has been carried out for a single electrolyte composition.