ChemInform Abstract: POLYPHOSPHAZENE SOLID ELECTROLYTES

Abstract

Das wie aufgezeichnet synthetisierte Gas‐ Polymere (III) bildet mit entsprechenden Metallsalzen die Komplexe (IV) mit guten Leitfähigkeiten bei Raumtemperatur.

Synthesis of Polyphosphazenes with Ethyleneoxy-Containing Side Groups: New Solid Electrolyte Materials

“…Four polymers were examined further by impedance analysis at room temperature. Polymer 1 has been studied previously and was used here as a control. − Polymer 2 has been reported previously and, due to its 30.5 °C melting transition temperature, was not examined. Polymer 3 and one polymer from each series ( 6 , 9 , and 12 ), with the lowest T m values of their group, were investigated.…”

“…A number of comb polymer systems with flexible backbones and short-chain polyether side groups have been investigated as solid polymer electrolyte materials. These include polyphosphazenes and polysiloxanes, among others. − It has been reported previously by Blonsky, Shriver, Austin, and Allcock that poly[bis((methoxyethoxy)ethoxy)phosphazene] (MEEP) ( 1 ), forms complexes with salts such as lithium or silver triflate that have conductivities 100−1000 times higher than a poly(ethylene oxide)−lithium salt standard at room temperature. − , One of the drawbacks of the MEEP system is its poor dimensional stability; the polymer flows under light pressure. Approaches to overcoming this problem include cross-linking by γ or ultraviolet radiation or through difunctional reagents and formation of blends, interpenetrating networks, or composites. − …”

“…These include polyphosphazenes and polysiloxanes, among others. [16][17][18][19][20][21][22][23][24][25][26][27] It has been reported previously by Blonsky, Shriver, Austin, and Allcock that poly[bis-((methoxyethoxy)ethoxy)phosphazene] (MEEP) (1), forms complexes with salts such as lithium or silver triflate that have conductivities 100-1000 times higher than a poly(ethylene oxide)-lithium salt standard at room temperature. [16][17][18][19]28 One of the drawbacks of the MEEP system is its poor dimensional stability; the polymer flows under light pressure.…”

Ionic Conduction in Polyphosphazene Solids and Gels: 13C, 31P, and 15N NMR Spectroscopy and Molecular Dynamics Simulations

“…The first polyphosphazene shown to give ionic conductivity when complexed with a metal salt was poly[bis(2-(2-methoxyethoxy)ethoxy)phosphazene], MEEP (structure 1, where X = oxygen ) ). − This material, with dissolved lithium or silver triflate, has an ionic conductivity in the range of 10 -5 S/cm, which is 2−3 orders of magnitude higher than PEO lithium triflate complexes at room temperature. Recently, other related polyphosphazenes have been synthesized, and some of these demonstrate higher conductivities, as well as increased dimensional stability …”

Polyphosphazene elastomers, gels, and other soft materials

“…They were originally tested as solvent-free electrolytes for rechargeable lithium batteries, having conductivities at least two orders of magnitude better than solid electrolytes based on the classical system of poly(ethylene oxide)/salt solutions, the traditional standard. [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70] However, conductivities near 10 À4 S cm À1 are roughly an order of magnitude less that the minimum generally required for practical lithium batteries. In current practice, commercial rechargeable lithium batteries use liquid electrolytes based on solutions of lithium salts in volatile flammable solvents such as propylene carbonate or other carbonates.…”