Effects of Lithium Doping on the Polymer Chain Dynamics in Siloxane/Poly(Ethylene Oxide) Ormolyte Nanocomposites:  A ¹³C and ⁷Li Exchange Solid-State NMR Study

Abstract

7Li and 13C solid-state NMR methods were used to study Li+-doped siloxane/poly(ethylene oxide) hybrid electrolyte materials, where the polymer chains are linked to the inorganic phase through covalent bonds. These methods were employed to analyze the effects of the interactions between the organic and inorganic (siloxane and lithium) phases on the polymer dynamics. The motion geometry of polymer chains was found to be very similar for Li+-doped and non-doped Ormolytes. However, a significant effect of the Li+ doping on the non-exponentiality of the correlation time functions that describe the polymer chain dynamics was observed, and a model that supports such behavior was proposed.

Organosilicon‐Based Functional Electrolytes for High‐Performance Lithium Batteries

“…Solid polymer electrolytes (SPEs) such as PEO suffer from comparatively low ionic conductivity at room temperature on account of the crystalline domains that restrain the ion transport. [ 132,133 ] Recently, organosilicon‐functionalized PEO has been evaluated as a reliable electrolyte owing to higher flashpoint, lower vapor pressure, better ionic conductivity, wider operating voltage, and higher thermal stability than pristine PEO and the traditional alkylcarbonates. [ 51,134–138 ] The performance improvement after functionalization originates from the finely tuned interactions among PEO, alkali salt and organosilicon, and the particular characteristics of organosilicon.…”

NMR study of photo‐crosslinked solid polymer electrolytes: The influence of monofunctional oligoethers

“…For a purposeful choice of the architectures to be built, it is necessary to understand in depth the factors affecting the performance of the membranes, that is, the parameters influencing the ion mobility and the transport processes in such systems. Ion dynamics can be studied by multinuclear dynamic NMR experiments . In particular, spin‐lattice relaxation and diffusion studies are well established in salt‐in‐polymer electrolytes .…”

Silicone containing copolymers: Synthesis, properties and applications

“…Products displayed composition-depended amphiphilic properties. PDMS-PEO copolymers doped with various metal ions or organic acids were characterized as polymeric electrolytes(232)(233)(234).MetallosupramolecularA-B type diblock copolymers where PEO and PDMS linked together by Ru(II) bis-terpyridine complex was reported(235). Well-defined micelles of the amphiphilic supramolecular structures with a moderate polydispersity were observed in aqueous medium by dynamic light scattering (DLS) and cryogenic TEM studies.Thermotropic phase behaviors and microstructures of PDMS-PEO copolymers were studied in melt by DSC, SAXS and optical microscopy.…”