Synthesis and ⁷Li Ion Dynamics in Polyarylene‐Ethersulfone‐Phenylene‐Oxide‐Based Polymer Electrolytes

Abstract

A new block‐co‐polymer based on poly(arylene ether sulfone) and nitrile‐functionalized poly(phenylene oxide) is prepared via polycondensation. Upon swelling with Li triflate dispersed in succinonitrile, a polymer electrolyte suitable for application in secondary Li ion batteries is obtained, which at temperatures above 313 K exhibits conductivities of 10−4–10−3 S cm−1. The presence of distinct coordination modes of the Li ions (not discernible from inspection of 7Li chemical shifts) is revealed based on a dynamic contrast identified from a distribution of transverse relaxation times. Three relaxation components reflecting polymer‐bound, partially and fully solvated Li ion species are identified on the basis of Carr–Purcell–Meiboom–Gill NMR data after inverse Laplace transformation and multiexponential relaxation analysis toolkit analysis thus highlighting the versatility of the applied methods.

Fluorinated polysulfonamide based single ion conducting room temperature applicable gel-type polymer electrolytes for lithium ion batteries

“…This is reasonable considering that for ionic conductivity measurements an external electric eld is applied, so that primarily charged species are taken into account, whereas data from PFG-NMR reect diffusion from all lithium species present in the electrolyte, including neutral clusters or aggregates as well as motion of otherwise associated lithium ions. 66 In principle, the degree of ion association a may be determined from the ratio of the two diffusion coefficients, as reported for some liquid or polymer electrolytes suitable for lithium ion batteries, 34,65,[67][68][69][70] as dividing D Li + ,calc by D Li + ,meas yields (1 À a), the degree of Li ion dissociation (cf. Table 1).…”