Ionically conductive polymer gels
AssigneeBTG International Limited
InventorsHugh Vyvyan St. Aubyn Hubbard, James Eric McIntyre, Victor Rogers, Ian Macmillan Ward
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Abstract
A bulk ionically conductive polymer gel is prepared by dissolving a salt such as lithium trifluoromethanesulphonate (which would provide lithium ion conductors) in an organic compound such as N-formylpiperidine. The organic compound dissolves the salt at 20° C. but is not a solvent at 20° C. though it is at 215° C.) for polyethylene terephthalate. The last-named is a crystallizable polymer which is added in a minor amount at a high temperature to the other components and provides the required mechanical rigidity for the product at lower temperatures.
Claims25
An ionically conductive ion-containing gel having a bulk ionic conductivity at 20° C. and 10 kHz greater than 1031 4 Siemens/cm and a dynamic modulus at 10 Hz greater than 103 Pa, wherein the gel consists of a crystallizable polymer, wherein the crystallizable polymer is present up to 50% by mass, and over 50% by mass of an organic compound selected from the group consisting of amides, sulphoxides and ethers, and a lithium salt with an anion selected from the group consisting of Br, I, a pseudohalogen and a perfluorinated alkyl carboxylate or sulphonate, said salt being soluble in said organic compound at 20° C. and dissolved therein at a concentration greater than 4% by mass based on said organic compound, wherein the said crystallizable polymer does not dissolve in the said organic compound at 20° C. but does dissolve therein at some higher temperature.
An ionically conductive ion-containing gel having a bulk ionic conductivity at 20° C. and 10 kHz greater than 10−4 Siemens/cm and a dynamic modulus at 10 Hz greater than 104 Pa, wherein the gel consists of a crystallizable polymer, wherein the crystallizable polymer is present in an amount of 20 to 40% by mass, and over 60% by mass of an organic compound or mixture of organic compounds, and a lithium salt with a monovalent anion selected from the group consisting of Br, I, a pseudohalogen a perfluorinated alkyl carboxylate or sulphonate anion and a complex inorganic monovalent anion, said salt being soluble in said organic compound at 20° C., and dissolved therein at a concentration greater than 4% by mass based on said organic compound, wherein said crystallizable polymer is a crystallizable halo substituted polyolefin which does not dissolve in said organic compound or mixture of organic compounds at 20° C. but does dissolve therein at some higher temperature.
Dependencies are inferred from the claim text.