Crosslinked polyethers as media for ionic conduction

Abstract

A broad outline is given of a comprehensive investigation dealing with solid polymeric electrolytes containing ionic species. These materials are based on various types of polyethers (homopolymers, block and graft copolymers) crosslinked via urethane chemistry and either filled with a salt or transformed into ionomers with the anions attached to the chains. The properties studied were specific volume, swelling, glass transition temperature, viscoelasticity, ionic conductivity, transport numbers, magnetic relaxation of nuclei from both the polymer chains and the ions, and redox stability. Mechanisms and models are proposed to explain chain partitioning by cations and the mode of ionic transport. An all‐solid‐state battery was prepared with one of these materials to prove its good performance.

Study of effect of composition, irradiation and quenching on ionic conductivity in (PEG) x : NH4NO3 solid polymer electrolyte

“…An increase in the glass transition temperature, T g , with an increase in the salt concentration was observed and this signifies that the flexibility of the polymer chains decreases with an increase in the salt concentration in the polymer system. This reduction in flexibility of chains is usually interpreted as being a result of the effects of an increase in intramolecular and intermolecular coordinations between coordinating sites on the same or different polymer chains caused by the ions acting as transient cross links (Le Nest 1988). Melting temperature, T m , of SPE system decreases as the salt content increases.…”

New polymer electrolytes based on ether sulfate anions for lithium polymer batteries

“…First of all and, insofar as the functional polymer has enough mechanical strength, they make macroporous separator made of apolar polyolefins unnecessary. This mechanical strength has often been achieved by the polymer crosslinking [1][2][3][4] while recently a huge increase in storage modulus was obtained, by addition of cellulosic nanofibers without compromising conductivity or electrochemical stability [5][6][7]. It is well known that these functional polymers may consist of solvating ether units and anionic functions bonded to the macromolecular backbone [8,9] that provide single-cation conducting network electrolytes [10].…”

Polymeric Membranes Containing Phosphorus in the Chain for Solid Polymer Electrolytes

“…It is known that the complexation of polymers with Lithium salts allowed the ions to act as transitory cross links. 23 The thermal stability of the membranes based on the polymers PPE I and II was also evaluated by the thermogravimetric analysis and flame retardancy. The obtained results are presented in Table 3.…”