Importance of the Ion-Pair Lifetime in Polymer Electrolytes.

ABSTRACT: Ion pairing is commonly considered as a culprit for the reduced ionic conductivity in polymer electrolyte systems. However, this simple thermodynamic picture should not be taken literally, as ion pairing is a dynamical phenomenon. Here we construct model poly(ethylene oxide)-bis(trifluoromethane)sulfonimide lithium salt systems with different degrees of ion pairing by tuning the solvent polarity and examine the relation between the cation-anion distinct conductivity σ_+-^d and the lifetime of ion pairs τ_+- using molecular dynamics simulations. It is found that there exist two distinct regimes where σ_+-^d scales with 1/τ_+- and τ_+-, respectively, and the latter is a signature of longer-lived ion pairs that contribute n

SUBMITTER: Gudla H 

PROVIDER: S-EPMC8436209 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature