Safe batteries with high charge-density and high power are a critical part of the strategy towards net zero carbon objectives. Lithium ion has emerged as the dominant battery chemistry thanks to its decreasing costs, energy density, efficiency, and both cycling and calendar stability. A key area for further improvement of Li ion (or post-lithium) battery chemistry is electrolyte design. Commercial Li ion batteries utilize liquid electrolytes whose flammability and poor mechanical properties can result in catastrophic failure. Solid polymer electrolytes (SPEs) have garnered much attention as safe, lightweight, and easily processable alternatives to the conventionally-used, liquid carbonate-based electrolytes for lithium ion batteries. However, SPEs exhibit low lithium ion conductivity due to slower polymer chain motion relative to liquid motion and due to incomplete solvation of the lithium salt, leading to reduced lithium transference number, lower power output, and slower charging. Molecular dynamics simulations are often used to determine the atomistic mechanisms of lithium diffusion in electrolyte systems. Recent computational and experimental studies have determined the charge diffusion of the most well-known polymer electrolyte system, polyethylene oxide (PEO) with lithium bis(triuoromethane-sulfonyl)imide (LiTFSI), to be driven by net-negative ion clusters of mostly anions. Simulations uncovered that this preference towards net-negative ion clusters is due to the lithium ions coordinating too strongly to the oxygens in PEO, effectively removing them as charge carriers and leaving an excess of anions to diffuse. Even so, there are unexplored disparities in the exact solvation structure and kinetic properties emergent across different PEO simulation studies.