US 6,605,237 B2 · Polyphosphazenes as gel polymer electrolytes

Abstract

Co-subsituted linear polyphosphazene polymers that useful in gel polymer electrolytes having an ion conductivity at room temperature of at least about 10−5 S/cm and comprising (i) a polyphosphazene having controlled ratios of side chains that promote ionic conductivity and hydrophobic, non-conductive side chains that promote mechanical stability, (ii) a small molecule additive, such as propylene carbonate, that influences the ionic conductivity and physical properties of the gel polymer electrolytes, and (iii) a metal salt, such as lithium trifluoromethanesulfonate, that influences the ionic conductivity of the gel polymer electrolytes, and methods of preparing the polyphosphazene polymers and the gel polymer electrolytes are disclosed.

Claims16

Dependent claims

A co-substituted linear phosphazene polymer having the formula:

—(NPRR′)q—
where R and R′, independently, and in any combination, represent side chain groups on a linear phosphazene chain and q, which is the number of moles of monomer units in the polymer, is from about 2 to about 20,000;
provided, however, (a) that at least a portion of the R groups impart ionic conductance to the polymer, (b) that at least a portion of the R′ groups are fluorine-containing or Si-containing non-conductive hydrophobic groups that provide the polymer with mechanical stability, and (c) that the polymer is capable of functioning as the sole polymer component of a gel electrolyte system having a conductance at room temperature of at least about 10−5 S/cm.

Dependencies are inferred from the claim text.

Polyphosphazenes as gel polymer electrolytes

Life of this patent

Polyphosphazenes as gel polymer electrolytes

Life of this patent

Abstract

Claims16