Water model

Physics

Solvation

Ionic liquid

Nanotechnology

Electrode

Organic chemistry

Statistical physics

Force field (fiction)

Catalysis

Polarizability

Computational chemistry

Physical chemistry

Chemical physics

Ionic bonding

Chemistry

Materials science

Polarization (electrochemistry)

Molecule

Molecular dynamics

Quantum mechanics

Electrolyte

Electric field

Chemical Reviews

Many applications in chemistry, biology, and energy storage/conversion research rely on molecular simulations to provide fundamental insight into structural and transport properties of materials with high ionic concentrations. Whether the system is comprised entirely of ions, like ionic liquids, or is a mixture of a polar solvent with a salt, e.g., liquid electrolytes for battery applications, the presence of ions in these materials results in strong local electric fields polarizing solvent molecules and large ions. To predict properties of such systems from molecular simulations often requires either explicit or mean-field inclusion of the influence of polarization on electrostatic interactions. In this manuscript, we review the pros and cons of different treatments of polarization ranging from the mean-field approaches to the most popular explicit polarization models in molecular dynamics simulations of ionic materials. For each method, we discuss their advantages and disadvantages and emphasize key assumptions as well as their adjustable parameters. Strategies for the development of polarizable models are presented with a specific focus on extracting atomic polarizabilities. Finally, we compare simulations using polarizable and nonpolarizable models for several classes of ionic systems, discussing the underlying physics that each approach includes or ignores, implications for implementation and computational efficiency, and the accuracy of properties predicted by these methods compared to experiments.

Molecular Dynamics Simulations of Ionic Liquids and Electrolytes Using Polarizable Force Fields